Article Abstract:
Cadmium (Cd) decreases the iron (Fe) uptake and ferrireductase activity of the Saccharomyces cerevisiae and causes toxicity. Cells grown in an iron-rich medium are resistant to the toxic effects of Cd due to the regulation of Fe metabolism by the YAP1 and CAD1/YAP2 genes. The genes probably change the redox status of the cells. Overexpression of YAP increases resistance to the iron chelator 1,10-phenanthroline and suppresses cell growth in an Fe deficient medium. The thiol present in the intercellular spaces and along the cell surface increases.
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Article Abstract:
Previous research has indicated the possibility that changes in the lipid environment can result in the activation of H+-ATPase in the plasma membrane of Saccharomyces cerevisiae. This hypothesis is investigated by studying the effect of decanoic acid on membrane fluidity and lipid composition in the plasma membrane H+-ATPase in cells grown either with or without decanoic acid. Results indicate a correlation between plasma membrane H+-ATPase activation and changes in membrane lipid constituents.
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Article Abstract:
The formation of spores by the yeast Saccharomyces cerevisiae, in a medium rich in nutrients, requires the presence of L-lysine and Ca2+ and is independent of the cAMP concentration. Sporulation takes place only when the concentration of L-lysine becomes 0.2-0.5 mmol/g cells. Ca2+ is obtained by the movement of Ca2+ into the cell from the external medium. D-lysine is also able to induce sporulation. The cells forming spores increase in size and collect L-lysine and L-cysteine.
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