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Genetic interactions between SIN3 mutations and the Saccharomyces cerevisiae transcriptional activators encoded by MCM1, STE12, and SWI1

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Abstract

SIN3 was first identified by a mutation which suppresses the effects of an swi5 mutation on expression of the HO gene in Saccharomyces cerevisiae. We now show that a sin3 mutation also partially suppresses the effects of swi1 on HO transcription, and partially suppresses the growth defect and inositol requirement observed in swi1 mutants. This suggests that SIN3 and SWI1 may play opposite regulatory roles in controlling expression of many yeast genes. Yeast SIN3 has been shown to function as a negative transcriptional regulator of a number of yeast genes. However, expression of the yeast STE6 gene is reduced in a sin3 mutant strain. This suggests that SIN3 functions as a positive regulator for STE6 transcription, although this apparent activation function could be indirect. In order to understand how SIN3 functions in STE6 regulation, we have performed a genetic analysis. It has been previously demonstrated that MCM1 and STE12 are transcriptional activators of a-specific genes such as STE6, and we now show that SWI1 is also required for STE6 expression. Our data suggest that STE12 and SWI1 function in different pathways of activation, and that STE12 is epistatic to SIN3 and SWI1. We show that the activities of the Mcmlp and Stel2p activators are modestly reduced in a sin3 mutant strain, and that phosphorylation of the Stel2p activator is decreased in a sin3 mutant. Thus, it is possible that the decreased transcription of STE6 in sin3 mutants is due to the combined effect of the diminished activities of Mcmlp and Stel2p.

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  1. H. Wang

    Present address: Genecor International, 180 Kimball Way, 94080, South San Francisco, CA, USA

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  1. Department of Cellular, Viral, and Molecular Biology, University of Utah Medical Center, 84132, Salt Lake City, UT, USA

    H. Wang, L. Reynolds-Hager & D. J. Stillman

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Wang, H., Reynolds-Hager, L. & Stillman, D.J. Genetic interactions between SIN3 mutations and the Saccharomyces cerevisiae transcriptional activators encoded by MCM1, STE12, and SWI1 . Molec. Gen. Genet. 245, 675–685 (1994). https://doi.org/10.1007/BF00297274

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