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Journal of Bacteriology, September 1999, p. 5219-5224, Vol. 181, No. 17
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

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

Alexander E. Beeser and Terrance G. Cooper*

Department of Microbiology and Immunology, University of Tennessee, Memphis, Tennessee 38163

Received 1 March 1999/Accepted 17 June 1999

Diploid Saccharomyces cerevisiae cells induce YVH1 expression and enter the developmental pathway, leading to sporulation when starved for nitrogen. We show that yvh1 disruption causes a defect in spore maturation; overexpression of MCK1 or IME1 suppresses this yvh1 phenotype. While mck1 mutations are epistatic to those in yvh1 relative to spore maturation, overexpression of MCK1 does not suppress the yvh1 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.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, University of Tennessee, Memphis, TN 38163. Phone: (901) 448-6175. Fax: (901) 448-8462. E-mail: tcooper{at}utmem1.utmem.edu.

Journal of Bacteriology, September 1999, p. 5219-5224, Vol. 181, No. 17
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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