Patent application title: Transgenic Plant Expressing Maltogenic Alpha-Amylase
Inventors:
Jack Bech Nielsen (Hellerup, DK)
Soren Kjaerulff (Vanlose, DK)
Assignees:
Novozymes A/S
IPC8 Class: AA21D200FI
USPC Class:
426 18
Class name: Food or edible material: processes, compositions, and products fermentation processes of farinaceous cereal or cereal material
Publication date: 2009-08-27
Patent application number: 20090214703
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Patent application title: Transgenic Plant Expressing Maltogenic Alpha-Amylase
Inventors:
Soren Kjaerulff
Jack Bech Nielsen
Agents:
NOVOZYMES NORTH AMERICA, INC.
Assignees:
Novozymes A/S
Origin: NEW YORK, NY US
IPC8 Class: AA21D200FI
USPC Class:
426 18
Abstract:
A transgenic plant cell expressing a maltogenic amylase (such as
Novamyl®) or a beta-amylase; a transgenic plant regenerated from said
cell, seeds generated from such plant where said seeds comprise a
maltogenic amylase or a beta-amylase and the use of said seeds,
optionally in ground form, for catalyzing an industrial process, such as
e.g. in baking. The maltogenic amylase providing an anti staling effect
in bread produced from the seeds in question.Claims:
1. A transgenic cereal plant cell comprising a nucleotide sequence
encoding a maltogenic alpha-amylase; wherein the maltogenic alpha-amylase
has an amino acid sequence which has at least 70% identity to amino acids
34-719 of SEQ ID NO: 2.
2. The plant cell according to claim 1, wherein the plant cell is a wheat plant cell.
3. The plant cell according to claim 1, wherein the maltogenic alpha-amylase has the amino acid sequence of amino acids 34-719 of SEQ ID NO:2
4. The plant cell according to claim 1, wherein said wherein the nucleotide sequence is operably linked to a seed specific promoter.
5. The plant cell according to claim 1, wherein the nucleotide sequence encoding the maltogenic alpha-amylase is derived from a microorganism.
6. The plant cell according to claim 1, wherein the nucleotide sequence encoding the maltogenic alpha-amylase is derived from the Bacillus strain NCIB 11837.
7. A transgenic cereal plant regenerated from a plant cell of claim 1 or the progeny of the plant, wherein the plant and the progeny of the plant are capable of expressing maltogenic alpha-amylase in the seeds of the plant or the progeny of the plant.
8. A transgenic cereal plant comprising a nucleotide sequence encoding a maltogenic alpha-amylase; wherein the maltogenic alpha-amylase has an amino acid sequence which has at least 70% identity to amino acids 34-719 of SEQ ID NO: 2.
9. The plant according to claim 8 which is a wheat plant.
10. The plant according to claim 8, wherein the maltogenic amylase is a maltogenic alpha-amylase having the amino acid sequence of amino acids 34-719 of SEQ ID NO: 2.
11. A seed of the cereal plant of claim S$ wherein the seed includes maltogenic alpha-amylase in an amount effective to delay staling of bread baked from the seed.
12. A transgenic cereal seed comprising a maltogenic alpha-amylase in an amount effective to delay staling of bread baked from the seed; wherein the maltogenic alpha-amylase has an amino acid sequence which has at least 70% identity to amino acids 34-719 of SEQ ID NO: 2.
13. The seed of claim 12, wherein the maltogenic alpha-amylase is a maltogenic alpha-amylase having the amino acid sequence of amino acids 34-719 of SEQ ID NO: 2.
14. The seed of claim 12, wherein the seed is a wheat seed.
15. A method for preparing a baked product, comprising the steps of:i) preparing a dough from flour obtained from cereal seed said seed comprising a maltogenic alpha-amylase;ii) preparing a dough comprising the flour of step i); andiii) baking the dough to obtain a baked product.
16. The method according of claim 15, wherein the maltogenic alpha-amylase is a maltogenic alpha-amylase having:(a) the amino acid sequence shown in SEQ ID NO: 2;(b) the amino sequence acid sequence of amino acids 1-686 of SEQ ID NO:1;(c) an amino acid sequence which has at least 70% identity to SEQ ID NO: 2; or(d) an amino acid sequence which has at least at least 70% identity to the amino acid sequence set forth in amino acids 1-686 of SEQ ID NO:1.
17. The method according to claim 15, wherein the seed includes the maltogenic alpha-amylase in an amount effective to delay staling of the bread product.
Description:
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001]This application is a divisional of U.S. application Ser. No. 11/048,000, filed Jan. 31, 2005, which is a continuation of U.S. application Ser. No. 09/831,656, filed May 11, 2001,, which is a 35 U.S.C. 371 national application of PCT/DK99/00624 filed Nov. 12, 1999, which claims priority or the benefit under 35 U.S.C. 119 of Danish application no. PA 1998 01478, filed Nov. 12, 1998 and U.S. provisional application No. 60/123,643 filed Mar. 10, 1999, the contents of which are fully incorporated herein by reference.
FIELD OF THE INVENTION
[0002]The present invention relates to a transgenic plant cell expressing a maltogenic amylase or a beta-amylase, a transgenic plant regenerated from said cell, seeds comprising a maltogenic amylase or a beta-amylase and the use of said seeds, optionally in ground form for catalyzing an industrial process.
BACKGROUND OF THE INVENTION
[0003]Maltogenic alpha-amylase (glucan 1,4-α-maltohydrolase, E.C. 3.2.1.133) is able to hydrolyze amylose and amylopectin to maltose in the alpha-configuration, and is also able to hydrolyze maltotriose as well as cyclodextrin. A maltogenic alpha-amylase from Bacillus (EP 120 693) is commercially available under the trade name Novamyl® (product of Novo Nordisk A/S, Denmark) and is widely used in the baking industry as an anti-staling agent due to its ability to reduce retrogradation of starch/amylopectin. Novamyl is further described by Christophersen, C., et al., 1998, Starch 50, pp 39-45. Variants of Novamyl® and the three-dimensional structure of Novamyl® are disclosed in WO 99/43794.
[0004]WO 91/14772 discloses transgenic seeds expressing enhanced amounts of enzymes, and the use of such seeds in catalyzing industrial processes. Baking is mentioned as one example of an industrial process for which α-amylase can be used and it is stated that the seeds may be ground before being incorporated into flour.
[0005]Vickers et al, Journal of the Institute of Brewing, Vol. 102, No. 2 pp. 75-78 (1996) speculate in using a Bacillus licheniformis α-amylase as a candidate enzyme for the genetic transformation of malting barley.
BRIEF DESCRIPTION OF THE INVENTION
[0006]The present invention relates to a cell of a transgenic seed producing plant transformed with at least one nucleotide sequence encoding a maltogenic alpha-amylase or a beta-amylase which, in the cell, is operably linked to elements required for mediating expression from said nucleotide sequence in the seeds of a plant regenerated from the plant cell.
[0007]In a further aspect the invention relates to a transgenic seed-producing plant regenerated from a cell of the invention and expressing measurable quantities of a maltogenic alpha-amylase or a beta-amylase in its seeds.
[0008]In a still further aspect the invention relates to the seeds of a plant of the invention, optionally in ground form, and the use of such seed for catalyzing an industrial process
[0009]The invention also relates to a method for producing a maltogenic alpha-amylase or beta-amylase comprising recovering the amylase or the beta-amylase from seeds of the invention.
DETAILED DISCLOSURE OF THE INVENTION
[0010]The maltogenic alpha-amylase is an enzyme classified in EC 3.21.133. The enzymatic activity does not require a non-reducing end on the substrate and the primary enzymatic activity results in the degradation of amylopectin and amylose to maltose and longer maltodextrins. It is able to hydrolyze amylose and amylopectin to maltose in the alpha-configuration, and is also able to hydrolyze maltotriose as well as cyclodextrin.
[0011]For the present invention in a particularly interesting embodiment the maltogenic alpha-amylase enzyme corresponds to maltogenic alpha-amylase cloned from Bacillus as described in EP 120 693 (hereinafter referred to as Novamyl). Novamyl has the amino acid sequence set forth in amino acids 1-686 of SEQ ID NO: 1. Novamyl is encoded in the gene harboured in the Bacillus strain NCIB 11837 (cf. ER 120 693) which has the nucleic acid sequence set forth in SEQ ID NO:1. Thus, in one preferred embodiment of the invention the maltogenic alpha-amylase enzyme is identical to a maltogenic alpha-amylase obtainable from Bacillus strain NCIB 11837.
[0012]In the context of the invention is also contemplated a nucleotide sequence encoding said enzyme, such as e.g. a nucleotide sequence obtainable from Bacilus strain NCIB 11837 encoding said enzyme. The coding sequence for Novamyl may be obtained from the strain DSM 11837 or from the plasmid denoted pLBei010 as indicated in WO 99/43794. The plasmid pLBei010 contains amyM in which the expression of amyM is directed by its own promoter and the complete gene encoding Novamyl, e.g., as contained in the strain DSM 11837. The plasmid contains the origin of replication, on, from plasmid pUB110 and an kanamycin resistance marker for selection purposes. pLBei010 is shown in FIG. 1. Preferably the maltogenic alpha-amylase enzyme for the present invention has an ants-staling effect in baking.
[0013]The present inventors have found that maltogenic alpha-amylases, (such as, e.g. Novamyl®) has a very unique performance in bread making. Other thermostable α-amylases like BAN® (product of Novo Nordisk A/S) or Termamyl® (product of Novo Nordisk A/S) must be dosed very carefully in tight intervals, e.g. between 0.5-2 times of the optimum dosage in a given recipe. Otherwise the risk is high that there is either no effect (low dosage) or too high effect (high dosage). The latter results in a gummy, non-elastic and sticky crumb, unsuited for eating. The inventors have found that maltogenic alpha-amylases does not have this problem, but can be dosed broadly. For instance, Novamyl® has a positive function on e.g. staling properties from a level of e.g. 200 MANU/kg flour to 5,000 MANU/kg, i.e. a much safer amylase in practical application than other α-amylases. This property of Novamyl® is thus a fundamental difference compared to known α-amylases. This characteristic makes it superior in baking applications, such as in connection with anti-staling, and it is also contemplated that this property makes maltogenic alpha-amylases, such as e.g. Novamyl®, particularly suitable for transgenic expression in plants, in particular in a seed producing plant, such as e.g. wheat. Accordingly, one embodiment of the present invention relates to the expression of a maltogenic alpha-amylase, such as Novamyl, in the seeds of a seed producing plant, such as, e.g. wheat.
[0014]Of particular interest for the present invention is enzymes having an anti-staling effect and at the same time having the above indicated characteristic, i.e. that relatively high dosage of the enzyme in baking does not have an essentially negative effect as compared to other enzymes. Within the scope of the invention is expression of such enzymes (with anti-staling effect and the above indicated dosage characteristics in baking) in the seeds of a seed producing plant, such as, e.g. wheat, and the use of such seed in baking. Examples of enzymes with such characteristics are maltogenic alpha-amylases, such as Novamyl. The negative effect of high dosage may be exemplified by the effect of use of high dosage of α-amylases in baking as indicated above.
[0015]Beta-amylase is another example of an enzyme that shows a relatively low level of criticality to high dosage in baking. Thus, one embodiment of the present invention relates to the expression of a beta-amylase in the seeds of a seed producing plant, such as, e.g. wheat, and the use of such seed in baking.
[0016]Within the scope of the invention is a maltogenic alpha-amylase being this an enzyme with one or more characteristics selected from the group consisting of:
[0017]i) having the amino acid sequence set forth in SEQ ID NO:2;
[0018]ii) having the amino acid sequence set forth in amino acids 1-686 of SEQ ID NO:1;
[0019]iii) having a three dimensional structural homology to Novamyl;
[0020]iv) having an amino acid sequence which has at least 70% identity to SEQ ID NO: 2, preferably at least 75%, 80%, 85% or at least 90%, e g. at least 95%, 97%, 98%, or at least 99%;
[0021]v) having an amino acid sequence which has at least 70% identity to the amino acid sequence set forth in amino acids 1-686 of SEQ ID NO:1, preferably at least 75%, 80%, 85% or at least 90%, e.g. at least 95%, 97%, 98%, or at least 99%;
[0022]vi) a fragment of i), ii) iv) or v), said fragment consisting of 10-600 amino acid residues, such as in the range of 30-300 amino acid residues, such as 50-100 amino acid residues:
[0023]vii) an amino acid sequence encoded by a nucleotide sequence which hybridizes (1) to the DNA sequence set forth in SEQ ID NO:1, (2) to the DNA sequence encoding Novamyl harboured in the Bacillus strain NCIB 11837: (3) to the DNA sequence contained in the nucleotides 100 to 2157 of SEQ ID NO:1, (4) to a subsequence of (1) or (3) of at least 30 nucleotides, such as at least 50 nucleotides, at least 100 nucleotides, at least 200 nucleotides, or (5) to a complementary strand of (1), (3), or (4) under low stringency conditions, or under medium stringency, more preferably at medium/high stringency or at high stringency or even more preferably at very high stringency;
[0024]viii) a catalytic binding site comprising amino acid residues similar to D229: E257 and D328 as shown in the amino acid sequence set forth in amino acids 1-686 of SEQ ID NO:1;
[0025]ix) a variant of the amino acid sequence set forth in amino acids 1-686 of SEQ ID NO1 comprising a substitution, deletion, and/or insertion of one or more amino acids;
[0026]The structural homology referred to above in iii) is as disclosed in WO 99/43794 and is based on other sequence homologies, hydrophobic cluster analysis or by reverse threading (Huber, T. Torda, A E, PROTEIN SCIENCE Vol. 7 , No. 1 pp. 142-149 (1998)) and which by any of these methods is predicted to have the same tertiary structure as Novamyl, wherein the tertiary structure refers to the overall folding or the folding of Domains A, B, and C, more preferably including Domain D, and most preferably including Domain E as disclosed in WO 99/43794. Alternatively, a structural alignment between Novamyl and a maltogenic alpha-amylase may be used to identify equivalent positions.
[0027]Maltogenic alpha-amylase variants are described in WO 99/43794. In further embodiments of the present invention the maltogenic alpha-amylase enzyme is a variant of the amino acid sequence set forth in amino acids 1-686 of SEQ ID NO:1 or a variant of SEQ ID NO:2, such variants are disclosed in WO 99/43794. WO 99143794 also discloses how such suitable modifications may be identified and how to prepare the modifications. Accordingly, the maltogenic alpha-amylase enzyme of the invention may be a maltogenic alpha-amylase enzyme variant having a modified amino acid sequence compared the amino acid sequence set forth in amino acids 1-686 of SEQ ID NO:1 or compared to SEQ ID NO:2.
[0028]The maltogenic alpha-amylase enzyme variant may have one or more of the following properties which are modified compared to an enzyme having the amino acid sequence of set forth in amino acids 1-686 of SEQ ID NO:1 or compared to SEQ ID NO: 2, such as stability (e.g. thermostability), pH dependent activity, substrate specificity, specific activity or ability to reduce retrogradation of starch or staling of bread. Thus, the altered property may be an altered specific activity at a given pH and/or an altered substrate specificity, such as an altered pattern of substrate cleavage or an altered pattern of substrate inhibition.
[0029]These variants may be modifications of SEQ ID NO: 2 or the amino acid sequence set forth in amino acids 1-686 of SEQ ID NO:1 consisting in substitution, deletion or insertion, or a mixture of these, of one or more amino acid residues.
[0030]In further embodiments of the invention the variant of a maltogenic alpha-amylase has an altered pH dependent activity profile as compared to Novamyl and has an amino acid sequence comprising a modification of an amino acid residue corresponding to one or more of the following residues of the amino acid sequence set forth in SEQ ID NO: 1:
D127, V129, F188, A229, Y258, V281, F284, T288, N327, M330, G370, N371, and D372, L71, S72, V74, L75, L78, T80, L81, G83, T84, D85, N86, T87, G88, Y89, H90, G91, T94, R95, D96, F97, I174, S175, N176, D178, D179, R180, Y181, E182, A193, Q184, K186, N187, F188 T189, D190, A192, G193, F194, S195, L196.
[0031]In further embodiments of the present invention the variant comprises a modification corresponding to one or more of the following modifications in the amino acid sequence set forth in SEQ ID NO: 1: D127N/L, V129S/T/G/V, F188E/K/H, A229S/T/G/V, Y258E/D/K/R/F/N, V281LT, F284K/H/D/E/Y, T288/E/K/R, N327D, M330L/F/I/D/E/K, G370N, N371D/E/G/K and D372N/V, L71I, S72C, V74I, L75N/D/Q/I/V, L78N/I, T80I/V/S/N/G, L81I/V/S/T/N/Q/K/H, G83A/S/T/N/Q/E/D/R/H/L, T84S/A/N/D/G, D85A/T/S/N/G, N86Q/E/D/Y/H/K, T87S/I, G88A/S/T, Y89F, H90N/Q/K, G91A/S/T, T94N/D/A/M/V/I, R95K/Q, D96N/V/Q/I, F97Y, I174N/Q/L, S175T/A/N/D, N176S/T/H/Q/P, D178N/Q/E/K/H, D179Y/N/H, R180W, Y181R/F/C/L, E182D, A183S/C/G, Q184E, K188R, N187Q/E/L/F/H/K/V/L, F188Y/L/I/H/N, T189N/D/A/S/H/Y/G, D190E/Q/H/N/K, A192/T/D/E/N/K, G193A/S/T, F194Y, S195N/D/E/R/K/G, L196I.
[0032]Other variants contemplated for the present invention are variants of Novamyl having an altered Ca2+ binding as compared to the parent maltogenic alpha-amylase and where said variant has an amino acid sequence comprising a modification of an amino acid residue corresponding to one or more of the following residues of the amino acid sequence set forth in SEQ ID NO: 1: D17, A30, S32, R95, H103, N131, Q201, I174, and/or H169, V74, L75, L78, T80, L81, T87 G88 Y89, H90, G91, T94 R95, D96, F97, Y167, F168, H169, H170, N171, G172, D173, I174, S175, N176, D178, D179, R180, Y181, E182, A183, Q184, K186, N187, F188, T189.
[0033]In one embodiment, the variant of SEQ ID NO: 1 has an altered Ca2+ binding as compared to the parent maltogenic alpha-amylase. In one embodiment of the invention the Ca2+ binding of a maltogenic alpha-amylase is change the partial sequence N28-P29-A30-K31-S32-Y33-G34 as set forth in SEQ ID NO: 1 is modified.
[0034]Further contemplated variants are variants having an amino acid sequence comprising a substitution corresponding to one or more of the following substitutions in the amino acid sequence set forth in SEQ ID NO: 1:
D17E/Q, A30M/L/A/V/I/E/Q, S32D/E/N/Q, R95M/L/A/V/I/E/Q, H103Y/N/Q/D/E N131D, Q201E, I174E/Q, and H169N/D/E/Q, V74I, L75N/D/Q/I/V, L78N/I, T80I//L/V/S/N/G, L81/V/S/T/N/Q/K/H, T87S/I, G88A/S/T, Y89F, H90N/Q/K, G91A/S/T, T94N/D/A/M/V/I, R95K/Q, D96N/V/Q/I, F97Y, Y167F/R/C, S175T/A/N/D, N176S/T/H/Q/P, D178N/Q/E/K/H, D179Y/N/H, R180W, Y181R/F/C/L, I174N/Q/L, S175T/A/N/D, N176S/T/H/Q/P, D178N/Q/E/K/H, D179Y/N/H, R180W, Y181R/F/C/L, E182D, A183S/C/G, Q184E, K186R, N187Q/E/L/F/H/K/V/L, F188Y/L/I/H/N, T189N/D/A/S/H/Y/G.
[0035]The maltogenic alpha-amylase variants may also have an altered thermostability and/or an altered temperature dependent activity profile compared to Novamyl, Such variants may comprise a substitution of an amino acid residue corresponding to one or more of the following residues of the amino acid sequence set forth in SEQ ID NO: 1:
L51, L75, L78, G88, G91, T94, V114, I125, V126, T134, G157, L217, S235, G236, V254, V279, V281, L286, V289, I290, V308, L321, I325, D326, L343, F349, S353, I359, I405, I448, Q449, L452, I470, G509, V515, S583, G625, L627, L628 and A670, L71, S72, V74, L75, L78, T80, L81, G83, T84, D85, N86, T87, G88, Y89, H90, G91, T94, R95, D96, F97, Y167, H169, H170, N171, G172, D173, I174, S175, N176, D178, D179, R180, Y181, E182, A183, Q184, K186, N187, F188, T189, D190, A192, G193, F194, S195, L196.
[0036]Such variants in the context of the invention may comprise one or more substitutions corresponding to the following substitutions in the amino acid sequence set forth in SEQ ID NO: 1: L217 in combination with L75 (e.g. L217F/Y in combination with L75F/Y), L51W, L75F/Y, L78I, G88A/V/T, G91T/S/V/N, T94/V/I/L, V114V/I/L, I125L/M/F/Y/W, V126I/L, T134V/I/L/M/F/Y/W, G157A/V/I/L, L217V/I/M/F/Y/W, S235I/L/M/F/Y/W, G236A/V/I/L/M/F/Y/W, V254I/L/M/F/Y/W, V279M/I/L/F, V281 I/L/M/F/Y/W, L286F, V289I/L/R, I290M/L/F, V308I/L/M/F/Y/W, L321I/M/F/Y/W, I325L/M/F/Y/W, D326E/Q, L343M/F/Y/W, F349W/Y, S353V/I/L, I359L/M/F/Y/W, I405M/L/Y/F/W, L448Y, Q449Y, L452M/Y/F/W, I470M/L/F, G509A/V/I/L/M/S/T/D/N, V515I/L, S583V/I/L/V, G625A/V/I/M/F/Y/W, L627M/F/Y, L628M/I/F/Y/W and A670V/I/L/M/F/Y/W, L71I, S72C, V74I, L75N/D/Q/I/V, L78N/I, T80I/L/V/S/N/G, L81I/V/S/T/N/Q/K/H, G83A/S/T/N/Q/E/D/R/H/L, T84S/A/N/D/G, D85A/T/S/N/G, N86Q/E/D/Y/H/K, T87S/I, G88A/S/T, Y89F, H90N/Q/K, G91A/S/T, T94N/D/A/M/V/I, R95K/Q, D96N/V/Q/I, F97Y, Y167F/R/C, F168Y, H169N/Q/K, H170N/Q/K, N171D/E/Q/H/R/K/G, G172A/T/S, D173N/S/T/Y/R/G, I174N/Q/L, S175T/A/N/D, N176S/T/H/Q/P, D178N/Q/E/K/H, D179Y/N/H, R180W, Y181R/F/C/L, E182D, A183S/C/G, Q184E, K186R, N187Q/E/L/F/H/K/V/L, F188Y/L/I/H/N, T189N/D/A/S/H/Y/G, D190E/Q/H/N/K, A192T/D/E/N/K, G193A/S/T, F194Y, S195N/D/E/R/K/G, L196.
[0037]Further variants may have an altered substrate binding site as compared to said parent. Such variant may comprise a modification in a position corresponding to one or both of the following positions in SEQ ID NO: 1: V281 and/or A629. in one embodiment of the invention the variant comprises a modification corresponding to: V281Q and/or A629N/D/E/Q.
[0038]Maltogenic alpha amylases having an improved ability to reduce the retrogradation of starch and/or s the staling of bread compared to Novamyl is also contemplated within the context of the invention. Such variants of Novamyl may comprise a modification at one or more positions corresponding to the following amino acid residues in SEQ ID NO: 1:
A30, K40, N115, T142, F188, T189, P191, A192, G193, F194, S195, D261, N327, K425, K520 and N595. Maltogenic alpha-amylases in the context of the invention may be a variant of Novamyl comprising one or more modifications corresponding to the following in SEQ ID NO: 1: A30D, K40R, N115D, T142A, F188L, T189Y, Δ(191-195), D261G, D261G, N327S, K425E, K520R and N595I.
[0039]Within the context of the invention are variants having a combination of one or more of the above with any of the other modifications disclosed herein.
[0040]Thus, the maltogenic alpha-amylase in relation to the present invention may have an amino acid which is modified compared to Novamyl where said modified sequence has one or more of the following modifications compared to the amino acid sequence set forth in amino acids 1-686 of SEQ ID NO:1:
192-A-193: Δ(191-195); D17E; S32Q; S32D; S32N; H103Y; N131D; I174Q; I174E; N176S; F188H; F188E; Δ191; 192-A-193; 192-A-G-193; Δ192; Δ262-266: F284E; F284D; F284K; T288K; T288R; N327D; G397P;
[0041]N115D+F188L; T142A+D261G; G370N+N371G; N115D+F188L; A30D+K40R+D261G; F188L+V336L+T525A; F188I+Y422F+I660V; F188L+D261G+T288P; Δ(191-195)+F188L+T189Y; K40R+F188L+D261G+A483T; T142A+N327S+K425E+K520R+N595I: T142A+N327S+K425E+K520R+N595I.
[0042]Nomenclature for amino acid modifications: The nomenclature used herein for defining mutations is essentially as described in WO 92/05249. Thus, F188H indicates a substitution of the amino acid F (Phe) in position 188 with the amino acid H (His). V129S/T/G/V indicates a substitution of V129 with S, T, G or V. Δ(191-195) or Δ(191-195) indicates a deletion of amino acids in positions 191-195. 192-A-193 indicates an insertion of A between amino acids 192 and 193.
[0043]The polypeptide sequence identity referred to above in v) is determined as the degree of homology between two sequences indicating a derivation of the first sequence from the second. The identity may be suitably determined by means of computer programs known in the art such as GAP, provided in the GCG program package (Program Manual for the Wisconsin Package, Version 8, August 1994, Genetics Computer Group, 575 Science Drive, Madison, Wis., USA 53711; Needleman, S. B. and Wunsch, C. D., 1970, Journal of Molecular Biology, 48, 443-453). Using GAP with the following settings for polypeptide sequence comparison: GAP creation penalty of 3.0 and GAP extension penalty of 0.1, the mature protein part of a polypeptide encoded by an analogous DNA sequence of the invention exhibits a degree of in identity preferably of at least 40%, preferably at least 50%, least 60%, at least 67%, at least 70%, preferably at least 75%,, 80%, 85%, at least 90%, e.g. at least 95%, 97%, 98%, or at least 99% identity to the amino acid sequence set forth in amino acids 1-686 of SEQ ID NO:1 or to the amino acid sequence set forth in SEQ ID NQ:2. In a prefered embodiment of the invention, the degree of identity between two amino acid sequences as disclosed herein is determined by the Clustal method (Higgins, 1989, CABIOS 5: 151-153) using the LASERGENE® MEGALIGN® software (DNASTAR, Inc., Madison, Wis.) with an identity table and the following multiple alignment parameters: Gap penalty of 10 and gap length penalty of 10. Pairwise alignment parameters were Ktuple=1, gap penalty=3, windows=5, and diagonals=5].
[0044]In connection with maltogenic alpha-amylases characterised by vii), the oligonucleotide probe used in a hybridization may be suitably prepared on the basis of the nucleic acid sequence set forth in SEQ ID NO:1.
[0045]The hybridization referred to above in vii) is intended to indicate that the analogous DNA sequence hybridizes to the nucleotide probe corresponding to the protein encoding part of the nucleic sequence shown in SEQ ID NO:1, under at least low stringency conditions as described in detail below.
[0046]Suitable experimental conditions for determining hybridization at low stringency between a nucleotide probe and a homologous DNA or RNA sequence involves presoaking of the filter containing the DNA fragments or RNA to hybridize in 5×SSC (sodium chloride/sodium citrate, Sambrook, et al., 1989) for 10 min, and prehybridization of the filter in a solution of 5×SSC, 5× Denhardt's solution (Sambrook. et al., 1989), 0.5% SDS and 100 μg/ml of denatured sonicated salmon sperm DNA (Sambrook, et al., 1989), followed by hybridization in the same solution containing a random-primed (Feinberg, A. P. and Vogelstein, B. (1983) Anal. Biochem. 132: 6-13), 32P-dCTP-labeled (specific activity>1×109 cpm/μg ) probe for 12 hours at ca. 45° C. The fitter is then washed twice for 30 minutes in 2×SSC, 0.5% SDS at least 55° C. (low stringency), more preferably at least 60° C. (medium stringency), more preferably at least 65° C. (medium/high stringency), more preferably at least 70° C. (high stringency), even more preferably at least 75° C. (very high stringency).
[0047]Molecules which hybridize to the oligonucleotide probe under these conditions are detected by exposure to x-ray film.
[0048]The following paragraphs describes how to prepare the transgenic plants of the invention, i.e. plants transformed so as to produce the enzymes as disclosed herein. Mainly maltogenic alpha-amylase is use as an examples but it is considered to be equally valid for the other enzymes mentioned herein, such as e.g. a beta-amylase.
Cloning a DNA Sequence Encoding a Maltogenic Alpha-amylase
[0049]The nucleotide sequence encoding the enzyme of the invention, such as the maltogenic alpha-amylase or beta-amylase, may be of any origin, including mammalian, plant and microbial origin and may be isolated from these sources by conventional methods.
[0050]Preferably, the nucleotide sequence is derived from a microorganism, such as a fungus, e.g. a yeast or a filamentous fungus, or a bacterium. The DNA sequence encoding a parent maltogenic alpha-amylase may be isolated from the cell producing the maltogenic alpha-amylase in question, using various methods well known in the art, for example, from the Bacillus strain NCIB 11837. First, a genomic DNA and/or cDNA library should be constructed using chromosomal DNA or messenger RNA from the organism that produces the maltogenic alpha-amylase to be studied. Then, if the amino acid sequence of the maltogenic alpha-amylase is known, homologous, labelled oligonucleotide probes may be synthesised and used to identify maltogenic alpha-amylase-encoding clones from a genomic library prepared from the organism in question. Alternatively, a labelled oligonucleotide probe containing sequences homologous to a known maltogenic alpha-amylase gene could be used as a probe to identify maltogenic alpha-amylase-encoding clones, using hybridization and washing conditions of lower stringency.
[0051]Another method for identifying maltogenic alpha amylase-encoding clones involves inserting fragments of genomic DNA into an expression vector, such as a plasmid, transforming maltogenic alpha-amylase negative bacteria with the resulting genomic DNA library, and then plating the transformed bacteria onto agar containing a substrate for maltogenic alpha-amylase, thereby allowing clones expressing maltogenic alpha-amylase activity to be identified.
[0052]Alternatively, the DNA sequence encoding the enzyme may be prepared synthetically by established standard methods, e.g. the phosphoroamidite method described by S. L. Beaucage and M. H. Caruthers (1981) or the method described by Matthes et al. (1984). In the phosphoroamidite method, oligonucleotides are synthesized, e.g. in an automatic DNA synthesizer, purified, annealed, ligated and cloned in appropriate vectors.
[0053]Finally, the DNA sequence may be of mixed genomic and synthetic origin, mixed synthetic and cDNA origin or mixed genomic and cDNA origin, prepared by ligating fragments of synthetic, genomic or cDNA origin, wherein the fragments correspond to various parts of the entire DNA sequence, in accordance with techniques well known in the art. The DNA sequence may also be prepared by polymerase chain reaction (PCR) using specific primers, for instance as described in U.S. Pat. No. 4,683,202 or R. K. Saiki et al. (1988). See also WO 99/43794 disclosing how to make variants, e.g. by use of mutagenesis techniques known in the art.
Expression Constructs
[0054]In order to accomplish expression of the maltogenic alpha-amylase in seeds of the transgenic plant of the invention the nucleotide sequence encoding the amylase is inserted into an expression construct containing regulatory elements capable of directing the expression of the nucleotide sequence and, if necessary, to direct secretion of the gene product or targeting of the gene product to the seeds of the plant. Manipulation of nucleotide sequences using restriction endonucleases to cleave DNA molecules into fragments and DNA ligase enzymes to unite compatible fragments into a single DNA molecule with subsequent incorporation into a suitable plasmid, cosmid, or other transformation vector are well-known in the art.
[0055]In order for transcription to occur the nucleotide sequence encoding the maltogenic alpha-amylase is operably linked to a suitable promoter capable of mediating transcription in the plant in question. The promoter may be an inducible promoter or a constitutive promoter. Typically, an inducible promoter mediates transcription in a tissue-specific or growth-stage specific manner, whereas a constitutive promoter provides for sustained transcription in all cell tissues. An example of a suitable constitutive promoter useful for the present invention is the cauliflower mosaic virus 35 S promoter. Other constitutive promoters are transcription initiation sequences from the tumor-inducing plasmid (Ti) of Agrobacterium such as the octopine synthase, nopaline synthase, or mannopine synthase initiator.
[0056]Examples of suitable inducible promoters include a seed-specific promoter such as the promoter expressing α-amylase in wheat seeds (see Stefanov et al, Acta Biologica Hungarica Vol. 42, No. 4 pp. 323-330 (1991), a promoter of the gene encoding a rice seed storage protein such as glutelin, prolamin, globulin or albumin (Wu et al., Plant and Cell Physiology Vol. 39, No. 8 pp. 885-889 (1998)), a Vicia faba promoter from the legumin B4 and the unknown seed protein gene from Vicia faba described by Conrad U. at al, Journal of Plant Physiology Vol. 152, No. 6 pp. 708-711 (1998), the storage protein napA promoter from Brassica napus, or any other seed specific promoter known in the art, e.g. as described in WO 91/14772.
[0057]In order to increase the expression of the maltogenic alpha-amylase it is desirable that a promoter enhancer element is used. For instance, the promoter enhancer may be an intron which is placed between the promoter and the amylase gene. The intron may be one derived from a monocot or a dicot. For instance, the intron may be the first intron from the rice Waxy (Wx) gene (Li et al., Plant Science Vol. 108, No. 2, pp. 181-190 (1995)), the first intron from the maize Ubi1 (Ubiquitin) gene (Vain et al., Plant Celt Reports Vol. 15, No. 7 pp. 489-494 (1996)) or the first intron from the Act1 (actin) gene. As an example of a dicot intron the chsA intron (Vain eat al. op cit,) is mentioned. Also, a seed specific enhancer may be used to increase the expression of the maltogenic alpha-amylase in seeds. An example of a seed specific enhancer is the one derived from the beta-phaseolin gene encoding the major seed storage protein of bean (Phaseotus vulgaris) disclosed by Vandergeest and Hall, Plant Molecular Biology Vol. 32, No. 4, pp. 579-588 (1996).
[0058]Also, the expression construct contains a terminator sequence to signal transcription termination of the maltogenic alpha-amylase gene such as the rbcS2' and the nos3' terminators.
[0059]To facilitate selection of successfully transformed plants, the expression construct should also include one or more selectable markers, e.g. an antibiotic resistance selection marker or a selection marker providing resistance to a herbicide. One widely used selection marker is the neomycin phosphotransferase gene (NPTII) which provides kanamycin resistance. Examples of other suitable markers include a marker providing a measurable enzyme activity, e.g. dihydrofolate reductase, tuciferase, and β-glucoronidase (GUS). Phosphinothricin acetyl transferase may be used as a selection marker in combination with the herbicide basta or bialaphos.
Transgenic Plant Species
[0060]In the present context the term "transgenic plant" is intended to mean a plant which has been genetically modified to express a maltogenic alpha-amylase and progeny of such plant having retained the capability of producing a maltogenic alpha-amylase. The term also includes a part of such plant such as a leaf, seed, stem, any tissue from the plant, an organelle, a cell of the plant, etc.
[0061]Any transformable seed-producing plant species may be used for the present invention. Of particular interest is a monocotyledonous plant species, in particular crop or cereal plants such as wheat (Triticum, e.g. aestivum), barley (Hordeum, e.g. vulgare), oats, rye, ricer sorghum and corn (Zea, eg mays). In particular, wheat is preferred.
[0062]Transformation of Plants
[0063]The transgenic plant cell of the invention may be prepared by methods known in the art. The transformation method used will depend on the plant species to be transformed and can be selected from any of the transformation methods known in the art such as Agrobacterium mediated transformation (Zambryski et at., EMBO Journal 2, pp 2143-2150, 1993), particle bombardment (Vasil et al. 1991), electroporation (Fromm et at. 1986, Nature 319, pp 791-793), and virus mediated transformation. For transformation of monocots particle bombardment (i.e. biolistic transformation) of embryogenic cell lines or cultured embryos are preferred. In the following references disclosing methods for transforming different plants are mentioned together with the plant: Rice (Cristou et at. 1991, Bio/Technology 9, pp. 957-962), Maize (Gordon-Kamm et al. 1990, Plant Cell 2, pp. 603-618), Oat (Somers et al. 1992, Bio/Technology 10, pp 1589-1594). Wheat (Vasil et al. 1991, Bio/Technology 10, pp. 667-674, Weeks et al. 1993, Plant Physiology 102, pp 1077-1084) and barley (Wan and Lemaux 1994, Plant Physiology 102, pp. 37-48, review Vasil 1994, Plant Mol. Biol. 25, pp 925-937).
[0064]More specifically, Agrobacterium mediated transformation Is conveniently achieved as follows. A vector system carrying the maltogenic alpha-amylase is constructed. The vector system may comprise one vector, but it can comprise two vectors. In the case of two vectors the vector system is referred to as a binary vector system (Gynheung An et al. (1980), Binary Vectors, Plant Molecular Biology Manual A3, 1-19).
[0065]An Agrobacterium based plant transformation vector consists of replication origin(s) for both E. coli and Agrobacterium and a bacterial selection marker. A right and preferably also a left border from the Ti plasmid from Agrobacterium tumefaciens or from the Ri plasmid from Agrobacterium rhizogens is nessesary for the transformation of the plant. Between the borders the expression construct is placed which contains the maltogenic alpha-amylase gene and appropriate regulatory sequences such as promotor and terminator sequences. Additionally, a selection gene e.g. the neomycin phosphotransferase type II (NPTII) gene from transposon Tn5 and a reporter gene such as the GUS (betha-glucuronidase) gene is cloned between the borders. A disarmed Agrobacterium strain harboring a helper plasmid containing the virulens genes is transformed with the above vector. The transformed Agrobacterium strain is then used for plant transformation.
Industrial Processes
[0066]In principle, the seeds of the invention may be used in any industrial process for which purified maltogenic alpha-amylase or beta-amylase are normally used to catalyze a reaction between one or more substrate so as to produce the desired effects or products. Of particular interest for the present invention is the use of the seeds in the bread making process for improving the properties of a dough or a baked product. According to one embodiment of the present invention the seeds of the invention are used directly in the baking process without the need for first extracting and/or isolating the enzyme. For use in a baking process it is preferred that the seeds containing the maltogenic alpha-amylase or beta-amylase are milled so as to obtain a consistency suitable for baking.
[0067]According to one aspect of the invention the seeds, optionally in a ground form, are used for preparing a flour, in particular wheat flour. More specifically, the flour may be prepared by milling seeds of the invention containing a maltogenic alpha-amylase or a beta-amylase. The milling may be conducted in accordance with methods known in the art for preparing flour from seeds.
[0068]When a flour has been produced from seeds of the present invention the maltogenic alpha-amylase activity of the resulting flour is normally measured and the strength of the enzyme activity adjusted. For instance, if too much maltogenic alpha-amylase activity is present in the flour prepared from transgenic seeds of the invention the flour may be diluted with flour free from the maltogenic alpha-amylase. If too little maltogenic alpha-amylase activity is present in the flour additional activity may be added, e.g. in the form of an isolated maltogenic alpha-amylase, such as Novamyl®, available from Novo Nordisk A/S. It follows, that the flour of the present invention may be prepared exclusively from transgenic seeds containing a maltogenic alpha-amylase or from a mixture of seeds which in addition to the transgenic seed of the invention contains non-transgenic seeds or seeds which otherwise do not contain the maltogenic alpha-amylase. The seeds of the invention preferably contains the maltogenic alpha-amylase in an amount which is effective to delay staling of a baked bread based on said seeds. One embodiment, the seed of the invention contains a measurable amount of the maltogenic alpha-amylase or the beta-amylase.
[0069]The flour of the invention may be is used in accordance with conventional techniques for the production of baked products, in particular bread products. The resulting baked product has an improved anti-staling effect, i.e. the baked product has a reduced rate of deterioration of quality parameters, e.g., softness and/or elasticity, during storage.
[0070]The maltogenic alpha-amylase, Novamyl®, has a very unique performance in bread making. Other thermostable α-amylases like BAN® or Termamyl® must be dosed very carefully in tight intervals, e.g. between 0.5-2 times of the optimum dosage in a given recipe. Otherwise the risk is high that there is either no effect (low dosage) or too high effect (high dosage). The latter will result in a gummy, non-elastic and sticky crumb, unsuited for eating. The maltogenic alpha-amylase as represented by Novamyl® does not have this problem, but can be dosed broadly. For instance, Novamyl® has a positive function on eg. staling properties from a level of e.g. 200 MANU/kg flour to 5,000 MANU/kg, i.e. a much safer amylase in practical application than other α-amylases.
[0071]The term "baked product" is defined herein as any product prepared from a dough, either of a soft or a crisp character. Examples of baked products, whether of a white, light or dark type, which may be advantageously produced by the present invention are bread (in particular white, whole-meal or rye bread), typically in the form of loaves or rolls, French baguette-type bread, pasta, pita bread, tortillas, tacos, cakes, pancakes, biscuits, cookies, pie crusts, steamed bread, and crisp bread, and the like.
[0072]In terms of enzyme activity, the appropriate dosage of the maltogenic alpha-amylase for exerting a desirable improvement of dough and/or baked products, in particular improved anti-staling properties, will depend on the specific amylase and the amylase substrate in question. The skilled person may determine a suitable enzyme unit dosage on the basis of methods known in the art. Normally, a suitable dosage of the maltogenic alpha-amylase (as present in the flour) is in the range 200-5,000 MANU/kg flour.
Determination of Maltogenic Amylase in MANU
[0073]One Maltogenic Amylase Novo Unit (MANU) is the amount of enzyme which under standard will cleave one μmol maltotriose per minute. The standard conditions are 10 mg/ml maltotriose, 37° C., pH 5.0. 30 minutes reaction time. The pH dependence is found by repeating this measurement at the same conditions, but at different pH values.
[0074]The invention is further illustrated with reference to the following examples which are not intended to be in any way limiting to the scope of the invention as claimed.
EXAMPLES
Example 1
Plasmid Construction
[0075]The plant novamyl plasmid pNP110 is constructed from the plasmid pAHC25(Christensen. A. H. Sharrock R. A. and Quail, P. H. (1992) Plant Mol. Bio. 1 18 675-689) containing the UidA reporter gene encoding beta-glucuronidase (GUS) and the bar gene as selective marker encoding phosphinothricin acetyl transferase which inactivates phosphinothricin, the active component in the herbicides Basta and Bialaphos. Each driven by the maize ubi1 promoter and the first intron and terminated by the polyadenylation signal of nos3' gene from Agrobacterium tumefaciens. The Novamyl mature gene is amplified using the forward primer: FNP110: 5'-tcccccgggatgagcagttccgcaagcgtcaaa-3' and the reverse primer RNP110: 5'-cgatgagctcctagttttgccacgt-3' using the pDN452 plasmid as template (DIDERICHSEN B. and CHRISTIANSEN L.(1988) FEMS Microbiol. Lett. 56: 53-60)under standard PCR conditions. The fragment of 2.0 Kb is digested with Smal and Sadl and ligated with the vector fragment of the plasmid pAHC25 digested with Smal and Sacl. The obtained plasmid designated pNP110 is used for the transformation experiments.
Transformation of Wheat
Plant Material:
[0076]Wheat (Tritordeum aestivum L.) plants are grown in greenhouses or in growth chambers in 16 h light (350 μmol m-2s-1)/8 h dark period at 16° C. wheat spikes are harvested when embryos are 1-2 mm. Caryopses are removed from the middle half of spikes 12 days after anthesis and surface sterilized for 10 min 5.25% sodium hypochlorite under stirring and finally washed twice in sterile H2O. Immature embryos are dissected from caryopses under a stereomicroscope using a scalpel and transferred to Petri dishes containing MS medium with scutellum side up. Twenty immature embryos are placed side by side in an area of 1 cm×1 cm and are ready for bombardment the following day.
Culture Media:
Murashige and Skoog Medium for Immature Embryos (MS):
[0077]4.3 g MS salts (Sigma M5524)
[0078]25 g Sucrose
[0079]100 mg Myo-inositol
[0080]500 mg Glutamin
[0081]100 mg Casein hydrolysate
[0082]5 g agarose
[0083]H2O to 1 L and adjust pH to 5.8.
[0084]After autoclaving add 1 ml filter sterilized vitamin solution (10 mg thiamin, 50 mg nicotinic acid, 50 mg pyridoxine HOC and 200 mg glycine in 100 mL H2O) and 1 mg 2,4-dichlorophenoxyacetic acid (2,4-D).
Selection Medium (MSS):
[0085]As MS without glutamine and casein hydrolysate, but with addition of 3 mg/L Bialaphos after autoclaving.
Shoot Induction Medium MSSI:
[0086]2.5 g MS salts, 15 g Sucrose; 50 mg Myo-inositol; 2.5 g agarose; 20 to 1 l and adjust pH to 5.8.
[0087]After autoclaving add filter-sterilized 5 mg/l bialaphos and 0.5 ml/l vitamin solution as MS and 0.1 mg/l filter-sterilized BAP, 6-benzylaminopurine
Root Induction Medium
[0088]Standard MS-medium (Sigma M9274) with filter-sterilized 1 mg/l bialaphos
Gold Coating:
[0089]6 mg gold particles are sterilized in 100 μl EtOH and vortexed for 3 min. After centrifugation at 10 K for 1 min and washed twice in H2O and finally the gold particles are resuspended in 100 μl H2O.
[0090]15 μg pNP110 Plasmid DNA, 50 μl of 2.5 M CaCl2 and 20 μl of 0.1 M spermidine are mixed with 50 μl gold suspension during vortexing for 3 min and centrifuged at 500 rpm for 5 min at 4° C. Supernatant is removed and the pellet is resuspended in 500 μl EtOH and centrifuged 500 rpm for 5 min at 4° C.
[0091]Finally, the pellet is resuspended in 80 μl EtOH and 10 μl coated gold particles are transferred to macrocarriers soaked in 70% EtOH for 10 min and air dryed.
Bombardment of Embryos:
[0092]The bombardment chamber and the acceleration cylinder is sterilized by spraying with 70% EtOH and air dryed. The delivery pressure is set to 1300 psi.
[0093]The rupture disk (1100 psi) and the steel mesh are soaked in EtOH for 10 min and air dryed. Rupture disk is placed properly in the holder and is fastened tightly. The macrocarrier and the steel mesh in the assembly unit is placed properly in the chamber (level 2 from top). The Petri dish with immature embryos is placed properly in the chamber (level 4 from top). Vacuum is turn on and subsequently the pressure is turn on at 1100 psi the rupture dish break and the DNA is bombarded into the immature embryos. The Petri dish is transferred to a growth chamber at 25° C. for 20 h without light.
[0094]The following day, the bombarded embryos are spread all over the area of the Petri dish containing MSS medium. After two to three transfers, one each second week, selected callus is transferred to shoot induction (MSSI) medium and transferred to a growth chamber with a 16 h light/8 h dark period. After two weeks green areas and shoot formation are visible, Only green-shoot-callus is transferred to new Petri dishes with MSSI medium or to tubes with root induction medium for two more weeks. Plant with roots in tubes are transferred to soil and placed in a greenhouse for three to four months and mature seeds are harvested.
Verification of Transgenic Wheat
Semipurification of Genomic DNA
[0095]0.25 g plant material in a eppendorf tube is chilled in N2 and grinded.
[0096]500 μl phenol/chloroform 1:1 and 500 μl buffer(50 mM Tris-HCL, pH 9.0+150 mM LiCl, 5 mM
[0097]EDTA, pH 8.0+5% SDS in H2O) is added with 10 μl RNAse (10 mg/ml).
[0098]Centrifuged 15000 rpm for 10 min
[0099]Topfase is transferred to a new eppendorf tube and 500 μl chloroform is added. Centrifuged 15000 rpm for 5 min and topfase is transferred to a new eppendorf tube and 1/10th vol 3 M NaAc, pH 5.3 is added with 2 vol EtOH. The tube is placed on ice for 30-60 min.
[0100]Centrifuged 1500 rpm for 20 min.
[0101]Washed with 70% EtOH, spin 6 min and air dry for 15 min.
[0102]Resuspended in 30 H2O and check 3 μl in an agarose gel.
PCR Analysis:
[0103]To test for the presence of The novamyl gene in genomic DNA of transformed lines, 250 ng genomic DNA of each transgenic line is used as template in PCR using the forward primer FN P110: 5'-tcccccgggatgagcagttccgcaagcgtcaaa-3' and the reverse primer RNP110: 5'-cgatgagcctagtttccacgt-3'. Standard PCR conditions are used with 40 cycles of 1 min at 94° C., 1 min at 61° C., 2 min 72° C.
[0104]Novamyl Positive plant lines showed a band of 2.0 kb, whereas non transformed plants showed no fragments of 2.0 kb
Example 2
[0105]The nucleotide sequence encoding Novamyl (SEQ ID NO: 1) is operably linked to the wheat promoter expressing α-amylase in wheat seeds as described in "Promoter and genotype dependent transient expression of a reporter gene in plant protoplasts."; Stefanov I; IIubaev S;. Feher A ; Margoczi K ; Dudits D; Acta Biologica Hungarica Vol. 42 N No. 4 pp. 323-330 ( 1991 The resulting DNA construct is inserted into a plasmid containing suitable regulatory elements and a selection marker, such as described in Example 1.
[0106]Protoplasts are isolated from wheat cell lines as described in ("Culture of and fertile plant-regeneration from regenerable embryogenic suspension cell-derived protoplasts of wheat (triticum-aestivum I)"; Ahmed, KZ; Sagi F; PLANT CELL REPORTS Vol. 12: pp. 175-179 (1993).
[0107]The nucleotide construct containing the maltogenic alpha-amylase coding sequence is inserted into wheat protoplast cells via PEG treatment as described in "Factors affecting transient expression of vector constructs in wheat protoplasts."; Ahmed K Z; Omirulleh S ; Sagi F ; Dudits D; Acta Biotogica Hungarica Vol. 48, No. 2 pp. 209-220 (1997). The resulting protoplast is regenerated into a wheat plant as described in "Fertile wheat (Triticum aestivum L.) regenerants from protoplasts of embryogenic suspension culture."; Pauk J; Kertesz Z; Jenes B; Purnhauser L; Manninen O; Pulli S; Barbas Z; Dudits D; Plant Cell Tissue and Organ Culture Vol. 38, No. 1 pp. 1-10 (1994). The seeds are harvested, and multiplied and used for producing transgenic wheat plant expressing Novamyl in its seeds.
Example 3
[0108]The wheat seeds are milled in accordance with conventional techniques for the preparation of wheat flour. Optionally, the wheat is allowed to malt to a predetermined degree before milling. This will allow a greater expression of the bacterial enzyme. The Novamyl content of the flour is determined in MANU: One MANU (Maltogenic Amylase Novo Unit) is defined as the amount of enzyme required to release one mmol of maltose per minute at a concentration of 10 mg of maltotriose (Sigma M 8378) substrate per ml of 0.1 M citrate buffer, pH 5.0 at 37° C. for 30 minutes.
[0109]If needed the content of Novamyl in the flour is adjusted as discussed above in the Detailed Description so as to result in a Novamyl content per kg of flour in the range of 200-5000 MANU/kg of flour.
Example 4
[0110]A baking trial is carried out. The transformed flour is compared to the original un-transformed wheat "sort". The optimum water absorption is determined on a Farinograph (AACC method The Farinograph Handbook, 3rd Edition. 1984, AACC, Edited by Bert L. D'Appolonia and Wallace H. Kunerth, ISBN 0-913250-37-6).
Preparation of White Bread (I)
[0111]The straight-dough bread-making method may be used according to AACC Method 10-10B (in Approved Methods of the American Association of Cereal Chemists, Ninth Edition, March 1995; AACC, St. Paul Minn., USA).
Basic Recipe
TABLE-US-00001 [0112] Wheat flour 100% Salt 1.5% Yeast (fresh) 5.3% Sugar 6.0% Shortening 3.0% Wafer optimum
[0113]All percentages are by weight relative to the wheat flour.
Procedure
[0114]1. Dough mixing (Hobart mixer):
[0115]The mixing time and speed should be determined by the skilled baker so as to obtain an optimum dough consistency under the testing conditions used.
[0116]2. 1st punch (e.g., 52 minutes after start)
[0117]3. 2nd punch (e.g., 25 minutes later)
[0118]4. Molding and panning (e.g., 13 minutes later).
[0119]5. Proofing to desired height (e.g. 33 minutes at 32° C., 82% RH)
[0120]5. Baking (e.g. at 215° C. for 24 minutes)
Preparation of White Bread (II):
[0121]The sponge-dough bread-making method may be used according to AACC Method 10-11 (in Approved Methods of the American Association of Cereal Chemists, Ninth Edition, March 1995; AACC, St. Paul Minn., USA).
Basic Recipe for Sponge
TABLE-US-00002 [0122] Wheat flour 60% Yeast (compressed) 36% Yeast Food 2% Water 36%
[0123]All percentages are by weight relative to the wheat flour.
Procedure
[0124]1. Add water to compressed yeast
[0125]2. Add yeast food in dry form with flour
[0126]3. Mix sponge (Hobart A-120; Hobart Corp., Troy Ohio, USA): [0127]0.5 minute at 1st speed [0128]1 minute at 2nd speed [0129]The mixing time may be adjusted so as to obtain an optimum dough consistency under the testing conditions used.
[0130]4. Ferment in a fermentation cabinet: 4 hours at 30° C., 85% RH
Basic Recipe for Dough
TABLE-US-00003 [0131] Wheat flour 40% Water 24% Sugar 5% Shortening 3% Salt 2%
[0132]All percentages are by weight relative to the wheat flour.
Procedure
[0133]1. Add dough ingredients; begin mixer (1st speed)
[0134]2. Add sponge in three approximately equal portions at 15, 25, and 35 seconds mixing time; total mixing time: 1 minute
[0135]3. At 2nd speed, mix to obtain an optimum dough consistency
[0136]4. Ferment in a fermentation cabinet. 30 minutes at 30° C. 85% RH
[0137]5. Intermediate proof: 12-15 minutes in fermentation cabinet
[0138]6. Mold and final proof at 35.5° C., 92% RH
[0139]7. Bake: 25 minutes at 218° C.
Example 5
Evaluation of Staling Properties of Bread:
[0140]The degree of stating is determined on bread, e.g., on day 1, 3, 7 and 9 after baking. Evaluation of staleness and texture can be done according to AACC method 74-09. The principles for determination of softness and elasticity of bread crumb are as follows:
[0141]1. A slice of bread is compressed with a constant speed in a texture analyser, measuring the force for compression in g.
[0142]2. The softness of the crumb is measured as the force at 25% compression.
[0143]3. The force at 40% compression (P2) and after keeping 40% compression constant for 30 seconds (P3) is measured. The ratio (P3/P2) is the elasticity of the crumb.
Sequence CWU
1
512160DNABacillus species 1atgaaaaaga aaacgctttc tttatttgtg ggactgatgc
tcctcatcgg tcttctgttc 60agcggttctc ttccgtacaa tccaaacgcc gctgaagcca
gcagttccgc aagcgtcaaa 120ggggacgtga tttaccagat tatcattgac cggttttacg
atggggacac gacgaacaac 180aatcctgcca aaagttatgg actttacgat ccgaccaaat
cgaagtggaa aatgtattgg 240ggcggggatc tggagggggt tcgtcaaaaa cttccttatc
ttaaacagct gggcgtaacg 300acaatctggt tgtccccggt tttggacaat ctggatacac
tggcgggcac cgataacacg 360ggctatcacg gatactggac gcgcgatttt aaacagattg
aggaacattt cgggaattgg 420accacatttg acacgttggt caatgatgct caccaaaacg
gaatcaaggt gattgtcgac 480tttgtgccca atcattcgac tccttttaag gcaaacgatt
ccacctttgc ggaaggcggc 540gccctctaca acaatggaac ctatatgggc aattattttg
atgacgcaac aaaagggtac 600ttccaccata atggggacat cagcaactgg gacgaccggt
acgaggcgca atggaaaaac 660ttcacggatc cagccggttt ctcgcttgcc gatttgtcgc
aggaaaatgg cacgattgct 720caatacctga ccgatgcggc ggttcaattg gtagcacatg
gagcggatgg tttgcggatt 780gatgcggtga agcattttaa ttcggggttc tccaaatcgt
tggccgataa actgtaccaa 840aagaaagaca ttttcctggt gggggaatgg tacggagatg
accccggaac agccaatcat 900ctggaaaagg tccggtacgc caacaacagc ggtgtcaatg
tgctggattt tgatctcaac 960acggtgattc gaaatgtgtt cggcacattt acgcaaacga
tgtacgatct taacaatatg 1020gtgaaccaaa cggggaacga gtacaaatac aaagaaaatc
taatcacatt tatcgataac 1080catgatatgt caagatttct ttcggtaaat tcgaacaagg
cgaatttgca ccaggcgctt 1140gctttcattc tcacttcgcg gggtacgccc tccatctatt
atggaaccga acaatacatg 1200gcaggcggca atgacccgta caaccggggg atgatgccgg
cgtttgatac gacaaccacc 1260gcctttaaag aggtgtcaac tctggcgggg ttgcgcagga
acaatgcggc gatccagtac 1320ggcaccacca cccagcgttg gatcaacaat gatgtttaca
tttatgaacg gaaatttttc 1380aacgatgtcg tgttggtggc catcaatcga aacacgcaat
cctcctattc gatttccggt 1440ttgcagacgg ccttgccaaa tggcagctat gcggattatc
tgtcagggct gttggggggg 1500aacgggattt ccgtttccaa tggaagtgtc gcttcgttca
cgcttgcgcc tggagccgtg 1560tctgtttggc agtacagcac atccgcttca gcgccgcaaa
tcggatcggt tgctccaaat 1620atggggattc cgggtaatgt ggtcacgatc gacgggaaag
gttttgggac gacgcaggga 1680accgtgacat ttggcggagt gacagcgact gtgaaatcct
ggacatccaa tcggattgaa 1740gtgtacgttc ccaacatggc cgccgggctg accgatgtga
aagtcaccgc gggtggagtt 1800tccagcaatc tgtattctta caatattttg agtggaacgc
agacatcggt tgtgtttact 1860gtgaaaagtg cgcctccgac caacctgggg gataagattt
acctgacggg caacataccg 1920gaattgggga attggagcac ggatacgagc ggagccgtta
acaatgcgca agggcccctg 1980ctcgcgccca attatccgga ttggttttat gtattcagcg
ttccagcagg aaagacgatt 2040caattcaagt tcttcatcaa gcgtgcggat ggaacgattc
aatgggagaa tggttcgaac 2100cacgtggcca caactcccac gggtgcaacc ggtaacatta
ctgttacgtg gcaaaactag 21602719PRTBacillus species 2Met Lys Lys Lys Thr
Leu Ser Leu Phe Val Gly Leu Met Leu Leu Ile1 5
10 15Gly Leu Leu Phe Ser Gly Ser Leu Pro Tyr Asn
Pro Asn Ala Ala Glu 20 25
30Ala Ser Ser Ser Ala Ser Val Lys Gly Asp Val Ile Tyr Gln Ile Ile
35 40 45Ile Asp Arg Phe Tyr Asp Gly Asp
Thr Thr Asn Asn Asn Pro Ala Lys 50 55
60Ser Tyr Gly Leu Tyr Asp Pro Thr Lys Ser Lys Trp Lys Met Tyr Trp65
70 75 80Gly Gly Asp Leu Glu
Gly Val Arg Gln Lys Leu Pro Tyr Leu Lys Gln 85
90 95Leu Gly Val Thr Thr Ile Trp Leu Ser Pro Val
Leu Asp Asn Leu Asp 100 105
110Thr Leu Ala Gly Thr Asp Asn Thr Gly Tyr His Gly Tyr Trp Thr Arg
115 120 125Asp Phe Lys Gln Ile Glu Glu
His Phe Gly Asn Trp Thr Thr Phe Asp 130 135
140Thr Leu Val Asn Asp Ala His Gln Asn Gly Ile Lys Val Ile Val
Asp145 150 155 160Phe Val
Pro Asn His Ser Thr Pro Phe Lys Ala Asn Asp Ser Thr Phe
165 170 175Ala Glu Gly Gly Ala Leu Tyr
Asn Asn Gly Thr Tyr Met Gly Asn Tyr 180 185
190Phe Asp Asp Ala Thr Lys Gly Tyr Phe His His Asn Gly Asp
Ile Ser 195 200 205Asn Trp Asp Asp
Arg Tyr Glu Ala Gln Trp Lys Asn Phe Thr Asp Pro 210
215 220Ala Gly Phe Ser Leu Ala Asp Leu Ser Gln Glu Asn
Gly Thr Ile Ala225 230 235
240Gln Tyr Leu Thr Asp Ala Ala Val Gln Leu Val Ala His Gly Ala Asp
245 250 255Gly Leu Arg Ile Asp
Ala Val Lys His Phe Asn Ser Gly Phe Ser Lys 260
265 270Ser Leu Ala Asp Lys Leu Tyr Gln Lys Lys Asp Ile
Phe Leu Val Gly 275 280 285Glu Trp
Tyr Gly Asp Asp Pro Gly Thr Ala Asn His Leu Glu Lys Val 290
295 300Arg Tyr Ala Asn Asn Ser Gly Val Asn Val Leu
Asp Phe Asp Leu Asn305 310 315
320Thr Val Ile Arg Asn Val Phe Gly Thr Phe Thr Gln Thr Met Tyr Asp
325 330 335Leu Asn Asn Met
Val Asn Gln Thr Gly Asn Glu Tyr Lys Tyr Lys Glu 340
345 350Asn Leu Ile Thr Phe Ile Asp Asn His Asp Met
Ser Arg Phe Leu Ser 355 360 365Val
Asn Ser Asn Lys Ala Asn Leu His Gln Ala Leu Ala Phe Ile Leu 370
375 380Thr Ser Arg Gly Thr Pro Ser Ile Tyr Tyr
Gly Thr Glu Gln Tyr Met385 390 395
400Ala Gly Gly Asn Asp Pro Tyr Asn Arg Gly Met Met Pro Ala Phe
Asp 405 410 415Thr Thr Thr
Thr Ala Phe Lys Glu Val Ser Thr Leu Ala Gly Leu Arg 420
425 430Arg Asn Asn Ala Ala Ile Gln Tyr Gly Thr
Thr Thr Gln Arg Trp Ile 435 440
445Asn Asn Asp Val Tyr Ile Tyr Glu Arg Lys Phe Phe Asn Asp Val Val 450
455 460Leu Val Ala Ile Asn Arg Asn Thr
Gln Ser Ser Tyr Ser Ile Ser Gly465 470
475 480Leu Gln Thr Ala Leu Pro Asn Gly Ser Tyr Ala Asp
Tyr Leu Ser Gly 485 490
495Leu Leu Gly Gly Asn Gly Ile Ser Val Ser Asn Gly Ser Val Ala Ser
500 505 510Phe Thr Leu Ala Pro Gly
Ala Val Ser Val Trp Gln Tyr Ser Thr Ser 515 520
525Ala Ser Ala Pro Gln Ile Gly Ser Val Ala Pro Asn Met Gly
Ile Pro 530 535 540Gly Asn Val Val Thr
Ile Asp Gly Lys Gly Phe Gly Thr Thr Gln Gly545 550
555 560Thr Val Thr Phe Gly Gly Val Thr Ala Thr
Val Lys Ser Trp Thr Ser 565 570
575Asn Arg Ile Glu Val Tyr Val Pro Asn Met Ala Ala Gly Leu Thr Asp
580 585 590Val Lys Val Thr Ala
Gly Gly Val Ser Ser Asn Leu Tyr Ser Tyr Asn 595
600 605Ile Leu Ser Gly Thr Gln Thr Ser Val Val Phe Thr
Val Lys Ser Ala 610 615 620Pro Pro Thr
Asn Leu Gly Asp Lys Ile Tyr Leu Thr Gly Asn Ile Pro625
630 635 640Glu Leu Gly Asn Trp Ser Thr
Asp Thr Ser Gly Ala Val Asn Asn Ala 645
650 655Gln Gly Pro Leu Leu Ala Pro Asn Tyr Pro Asp Trp
Phe Tyr Val Phe 660 665 670Ser
Val Pro Ala Gly Lys Thr Ile Gln Phe Lys Phe Phe Ile Lys Arg 675
680 685Ala Asp Gly Thr Ile Gln Trp Glu Asn
Gly Ser Asn His Val Ala Thr 690 695
700Thr Pro Thr Gly Ala Thr Gly Asn Ile Thr Val Thr Trp Gln Asn705
710 715333DNAArtificial SequenceSynthetic
construct 3tcccccggga tgagcagttc cgcaagcgtc aaa
33425DNAArtificial SequenceSynthetic construct 4cgatgagctc
ctagttttgc cacgt
255686PRTBacillus species 5Ser Ser Ser Ala Ser Val Lys Gly Asp Val Ile
Tyr Gln Ile Ile Ile1 5 10
15Asp Arg Phe Tyr Asp Gly Asp Thr Thr Asn Asn Asn Pro Ala Lys Ser
20 25 30Tyr Gly Leu Tyr Asp Pro Thr
Lys Ser Lys Trp Lys Met Tyr Trp Gly 35 40
45Gly Asp Leu Glu Gly Val Arg Gln Lys Leu Pro Tyr Leu Lys Gln
Leu 50 55 60Gly Val Thr Thr Ile Trp
Leu Ser Pro Val Leu Asp Asn Leu Asp Thr65 70
75 80Leu Ala Gly Thr Asp Asn Thr Gly Tyr His Gly
Tyr Trp Thr Arg Asp 85 90
95Phe Lys Gln Ile Glu Glu His Phe Gly Asn Trp Thr Thr Phe Asp Thr
100 105 110Leu Val Asn Asp Ala His
Gln Asn Gly Ile Lys Val Ile Val Asp Phe 115 120
125Val Pro Asn His Ser Thr Pro Phe Lys Ala Asn Asp Ser Thr
Phe Ala 130 135 140Glu Gly Gly Ala Leu
Tyr Asn Asn Gly Thr Tyr Met Gly Asn Tyr Phe145 150
155 160Asp Asp Ala Thr Lys Gly Tyr Phe His His
Asn Gly Asp Ile Ser Asn 165 170
175Trp Asp Asp Arg Tyr Glu Ala Gln Trp Lys Asn Phe Thr Asp Pro Ala
180 185 190Gly Phe Ser Leu Ala
Asp Leu Ser Gln Glu Asn Gly Thr Ile Ala Gln 195
200 205Tyr Leu Thr Asp Ala Ala Val Gln Leu Val Ala His
Gly Ala Asp Gly 210 215 220Leu Arg Ile
Asp Ala Val Lys His Phe Asn Ser Gly Phe Ser Lys Ser225
230 235 240Leu Ala Asp Lys Leu Tyr Gln
Lys Lys Asp Ile Phe Leu Val Gly Glu 245
250 255Trp Tyr Gly Asp Asp Pro Gly Thr Ala Asn His Leu
Glu Lys Val Arg 260 265 270Tyr
Ala Asn Asn Ser Gly Val Asn Val Leu Asp Phe Asp Leu Asn Thr 275
280 285Val Ile Arg Asn Val Phe Gly Thr Phe
Thr Gln Thr Met Tyr Asp Leu 290 295
300Asn Asn Met Val Asn Gln Thr Gly Asn Glu Tyr Lys Tyr Lys Glu Asn305
310 315 320Leu Ile Thr Phe
Ile Asp Asn His Asp Met Ser Arg Phe Leu Ser Val 325
330 335Asn Ser Asn Lys Ala Asn Leu His Gln Ala
Leu Ala Phe Ile Leu Thr 340 345
350Ser Arg Gly Thr Pro Ser Ile Tyr Tyr Gly Thr Glu Gln Tyr Met Ala
355 360 365Gly Gly Asn Asp Pro Tyr Asn
Arg Gly Met Met Pro Ala Phe Asp Thr 370 375
380Thr Thr Thr Ala Phe Lys Glu Val Ser Thr Leu Ala Gly Leu Arg
Arg385 390 395 400Asn Asn
Ala Ala Ile Gln Tyr Gly Thr Thr Thr Gln Arg Trp Ile Asn
405 410 415Asn Asp Val Tyr Ile Tyr Glu
Arg Lys Phe Phe Asn Asp Val Val Leu 420 425
430Val Ala Ile Asn Arg Asn Thr Gln Ser Ser Tyr Ser Ile Ser
Gly Leu 435 440 445Gln Thr Ala Leu
Pro Asn Gly Ser Tyr Ala Asp Tyr Leu Ser Gly Leu 450
455 460Leu Gly Gly Asn Gly Ile Ser Val Ser Asn Gly Ser
Val Ala Ser Phe465 470 475
480Thr Leu Ala Pro Gly Ala Val Ser Val Trp Gln Tyr Ser Thr Ser Ala
485 490 495Ser Ala Pro Gln Ile
Gly Ser Val Ala Pro Asn Met Gly Ile Pro Gly 500
505 510Asn Val Val Thr Ile Asp Gly Lys Gly Phe Gly Thr
Thr Gln Gly Thr 515 520 525Val Thr
Phe Gly Gly Val Thr Ala Thr Val Lys Ser Trp Thr Ser Asn 530
535 540Arg Ile Glu Val Tyr Val Pro Asn Met Ala Ala
Gly Leu Thr Asp Val545 550 555
560Lys Val Thr Ala Gly Gly Val Ser Ser Asn Leu Tyr Ser Tyr Asn Ile
565 570 575Leu Ser Gly Thr
Gln Thr Ser Val Val Phe Thr Val Lys Ser Ala Pro 580
585 590Pro Thr Asn Leu Gly Asp Lys Ile Tyr Leu Thr
Gly Asn Ile Pro Glu 595 600 605Leu
Gly Asn Trp Ser Thr Asp Thr Ser Gly Ala Val Asn Asn Ala Gln 610
615 620Gly Pro Leu Leu Ala Pro Asn Tyr Pro Asp
Trp Phe Tyr Val Phe Ser625 630 635
640Val Pro Ala Gly Lys Thr Ile Gln Phe Lys Phe Phe Ile Lys Arg
Ala 645 650 655Asp Gly Thr
Ile Gln Trp Glu Asn Gly Ser Asn His Val Ala Thr Thr 660
665 670Pro Thr Gly Ala Thr Gly Asn Ile Thr Val
Thr Trp Gln Asn 675 680 685
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