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Analysis of lysine-dependent yeast sporulation: a decrease in cyclic AMP is not required for initiation of meiosis and sporulation in Saccharomyces cerevisiae Export

Microbiology, Vol. 141, No. 10. (1 October 1995), pp. 2463-2469.

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Summary: Cells of the yeast Saccharomyces cerevisiae sporulated in nutrient-rich medium containing L-lysine. Sporulation was specific to the presence of L-lysine and was initiated when the cellular content of this basic amino acid reached approximately 0.2-0.5 mmol (g cells)-1, at early stationary phase. The formation of asci was most efficient at pH 7.0 and 50-100 mM L-lysine; in these optimum conditions, the sporulation frequency reached about 60% after 5 d incubation. The L-lysine-dependent sporulation system in nutrient-rich conditions was distinct from the currently used potassium-acetate-dependent system in nutrient-deficient conditions. Analysis of the L-lysine-dependent system indicated that, prior to entrance into meiosis and/or sporulation processes, the yeast cells change in shape, their pool sizes for L-cysteine and glutathione alter, and they synthesize a protein with a molecular mass of 15 kDa. A low level of cAMP was not required for the entrance into meiosis and/or sporulation. 10.1099/13500872-141-10-2463


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