Article Abstract:
RNA triphosphatase, guanylyl-transferase and methyltransferase are enzymatic activities wherein sequential action is needed by mRNA capping. The gene (CEL-1) is believed to encode the C.elegans capping enzymes and has a C-terminal domain having motifs detected in yeast and vaccinia virus capping enzyme guanylyltransferases. The N-terminal domain of CEL-1 has a noticeable sequence resemblance to the protein tyrosine phosphatase (PTP) enzyme family although it does not have detectable PTP activity. Furthermore, this domain is not similar to vaccinia virus capping enzyme even though it has RNA triphosphatase activity.
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Article Abstract:
Double-stranded RNA (dsRNA) was infused into Drosophila embryos to interfere with the gene function and determine the process of signal transduction of Drosophila Wnt-1 ortholog Wingless (Wg). The injection demonstrated that dsRNA effectively and specifically constrains the activities of wg, fushi tarazu, even-skipped and tramtrack. By comparison, single-strand RNA did not have any potency. When combined, interference of the frizzled and Drosophila frizzled 2 genes led to embryonic patterning defects that emulate loss of wingless function. However, single interference did not alter patterning.
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Article Abstract:
A broadly applicable genetic method that exploits the power of Escherichia coli genetics is developed to identify Rev amino acid residues with the ability to recognize Rev response element stem-loop IIB. The method, which subjects IacZ expression to translational control by inserting a binding site for the protein, is applied to the HIV Rev-1 protein. Results provide genetic evidence of the direct contact between specific Rev amino acids and RNA nucleotides in the RNA complex of Rev.
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