Identification of the Saccharomyces cerevisiae genes STB1–STB5 encoding Sin3p binding proteins (original) (raw)

Abstract

The yeast SIN3 gene functions as a transcriptional repressor, despite the fact that Sin3p does not bind DNA directly. We have conducted a two-hybrid screen to look for proteins that interact with Sin3p, using the PAH2 domain of Sin3p as bait. Five new genes, STB1_–_STB5 were identified, as well as the STB6 gene, which is similar to STB2. STB1, STB2, STB3, and STB6 are novel genes, and STB4 and STB5 encode C6 zinc cluster DNA-binding proteins. None of these genes is essential for viability, and several of these genes may encode transcriptional activators. Several special problems were encountered in using a transcriptional repressor in a two-hybrid screen. For example, the STB genes will interact with a LexA-Sin3(PAH2) fusion protein containing a region of Sin3p, but a LexA-Sin3p fusion protein containing full-length Sin3p, along with a STB clone, does not produce two-hybrid activation of a transcriptional reporter. In addition, a sin3 mutation reduces the transcriptional activation by two-hybrid partners, suggesting that a sin3 mutation reduces the transcriptional efficiency of the Gal4p and VP16 activation domains. We have shown previously that Sin3p is part of a large multiprotein complex, and we show here that Stb1p and Stb2p are present in this complex.

Access this article

Log in via an institution

Subscribe and save

Buy Now

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Similar content being viewed by others

Author information

Authors and Affiliations

  1. Division of Molecular Biology and Genetics, Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah Health Sciences Center, Salt Lake City, UT 84132, USA Fax: + 1–801–581–3607; e-mail: stillman@genetics.utah.edu, , , , , , US
    M. M. Kasten & D. J. Stillman

Authors

  1. M. M. Kasten
    You can also search for this author inPubMed Google Scholar
  2. D. J. Stillman
    You can also search for this author inPubMed Google Scholar

Additional information

Received: 2 April 1997 / Accepted: 2 July 1997

Rights and permissions

About this article

Cite this article

Kasten, M., Stillman, D. Identification of the Saccharomyces cerevisiae genes STB1_–_STB5 encoding Sin3p binding proteins.Mol Gen Genet 256, 376–386 (1997). https://doi.org/10.1007/s004380050581

Download citation