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DiploidSaccharomyces cerevisiae cells induce YVH1 expression and enter the developmental pathway, leading to sporulation when starved for nitrogen. We show thatyvh1 disruption causes a defect in spore maturation; overexpression ofMCK1 orIME1 suppresses thisyvh1 phenotype. Whilemck1 mutations are epistatic to those inyvh1 relative to spore maturation, overexpression ofMCK1 does not suppress theyvh1 slow-vegetative-growth phenotype. We conclude that (i) Yvh1p functions earlier than Mck1p and Ime1p in the signal transduction cascade that regulates sporulation and is triggered by nitrogen starvation and (ii) the role of Yvh1p in gametogenesis can be genetically distinguished from its role in vegetative growth.

journal of bacteriology

The Dual-Specificity Protein Phosphatase Yvh1p Acts Upstream of the Protein Kinase Mck1p in Promoting Spore Development in <i>Saccharomyces cerevisiae</i>

The Dual-Specificity Protein Phosphatase Yvh1p Acts Upstream of the Protein Kinase Mck1p in Promoting Spore Development in Saccharomyces cerevisiae