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Molecular and Cellular Biology, October 1998, p. 5970-5980, Vol. 18, No. 10
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Transcriptional Regulation of the SMK1 Mitogen-Activated Protein Kinase Gene during Meiotic Development in Saccharomyces cerevisiae

Michael Pierce,1 Marisa Wagner,1 Jianxin Xie,2 Valérie Gailus-Durner,2 John Six,1 Andrew K. Vershon,2 and Edward Winter1,*

Department of Biochemistry and Molecular Pharmacology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107,1 and Waksman Institute and Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 088542

Received 3 April 1998/Accepted 18 May 1998

Meiotic development (sporulation) in Saccharomyces cerevisiae is characterized by an ordered pattern of gene expression, with sporulation-specific genes classified as early, middle, mid-late, or late depending on when they are expressed. SMK1 encodes a mitogen-activated protein kinase required for spore morphogenesis that is expressed as a middle sporulation-specific gene. Here, we identify the cis-acting DNA elements that regulate SMK1 transcription and characterize the phenotypes of mutants with altered expression patterns. The SMK1 promoter contains an upstream activating sequence (UASS) that specifically interacts with the transcriptional activator Abf1p. The Abf1p-binding sites from the early HOP1 and the middle SMK1 promoters are functionally interchangeable, demonstrating that these elements do not play a direct role in their differential transcriptional timing. Timing of SMK1 expression is determined by another cis-acting DNA sequence termed MSE (for middle sporulation element). The MSE is required not only for activation of SMK1 transcription during middle sporulation but also for its repression during vegetative growth and early meiosis. In addition, the SMK1 MSE can repress vegetative expression in the context of the HOP1 promoter and convert HOP1 from an early to a middle gene. SMK1 function is not contingent on its tight transcriptional regulation as a middle sporulation-specific gene. However, promoter mutants with different quantitative defects in SMK1 transcript levels during middle sporulation show distinct sporulation phenotypes.

* Corresponding author. Mailing address: Department of Biochemistry and Molecular Pharmacology, Thomas Jefferson University, 233 South 10th St., Philadelphia, PA 19107. Phone: (215) 503-4139. Fax: (215) 923-9162. E-mail: winter{at}calvin.jci.tju.edu.

Molecular and Cellular Biology, October 1998, p. 5970-5980, Vol. 18, No. 10
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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