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Molecular and Cellular Biology, September 1998, p. 5500-5510, Vol. 18, No. 9
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Transcriptional Repression by the SMRT-mSin3 Corepressor: Multiple Interactions, Multiple Mechanisms, and a Potential Role for TFIIB

Chi-Wai Wong and Martin L. Privalsky*

Section of Microbiology, Division of Biological Sciences, University of California at Davis, Davis, California 95616

Received 22 January 1998/Returned for modification 10 March 1998/Accepted 11 June 1998

A variety of eukaryotic transcription factors, including the nuclear hormone receptors, Max-Mad, BCL-6, and PLZF, appear to mediate transcriptional repression through the ability to recruit a multiprotein corepressor complex to the target promoter. This corepressor complex includes the SMRT/N-CoR polypeptides, mSin3A or -B, and histone deacetylase 1 or 2. The presence of a histone-modifying activity in the corepressor complex has led to the suggestion that gene silencing is mediated by modification of the chromatin template, perhaps rendering it less accessible to the transcriptional machinery. We report here, however, that the corepressor complex actually appears to exhibit multiple mechanisms of transcriptional repression, only one of which corresponds with detectable recruitment of the histone deacetylase. We provide evidence instead of an alternative pathway of repression that may be mediated by direct physical interactions between components of the corepressor complex and the general transcription factor TFIIB.

* Corresponding author. Mailing address: Section of Microbiology, Division of Biological Sciences, One Shields Ave., University of California at Davis, Davis, CA 95616. Phone: (530) 752-3013. Fax: (530) 752-9014. E-mail: mlprivalsky{at}ucdavis.edu.

Molecular and Cellular Biology, September 1998, p. 5500-5510, Vol. 18, No. 9
0270-7306/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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Copyright © 1998 by the American Society for Microbiology. All rights reserved.