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Molecular and Cellular Biology, October 2005, p. 9016-9027, Vol. 25, No. 20
0270-7306/05/$08.00+0     doi:10.1128/MCB.25.20.9016-9027.2005

Regulating SWI/SNF Subunit Levels via Protein-Protein Interactions and Proteasomal Degradation: BAF155 and BAF170 Limit Expression of BAF57

Jianguang Chen and Trevor K. Archer*

Chromatin and Gene Expression Section, Laboratory of Molecular Carcinogenesis, National Institute of Environmental Health Sciences, National Institutes of Health, 111 Alexander Drive, P.O. Box 12233 (MD C4-06), Research Triangle Park, North Carolina 27709

Received 1 June 2005/ Returned for modification 5 July 2005/ Accepted 18 July 2005

The mammalian SWI/SNF chromatin remodeling complex, whose function is of critical importance in transcriptional regulation, contains approximately 10 protein components. The expression levels of the core SWI/SNF subunits, including BRG1/Brm, BAF155, BAF170, BAF60, hSNF/Ini1, and BAF57, are stoichiometric, with few to no unbound molecules in the cell. Here we report that exogenous expression of the wild type or certain deletion mutants of BAF57, a key subunit that mediates the interaction between the remodeling complex and transcription factors, results in diminished expression of endogenous BAF57. This down-regulation process is mediated by an increase in proteasome-dependent degradation of the BAF57 protein. Furthermore, the protein levels of BAF155/170 dictate the maximum cellular amount of BAF57. We mapped the domains responsible for the interaction between BAF57 and BAF155 and demonstrated that protein-protein interactions between them play an important role in this regulatory process. These findings provide insights into the physiological mechanisms responsible for maintaining the proper stoichiometric levels of the protein components comprising multimeric enzyme complexes.

* Corresponding author. Mailing address: Chromatin and Gene Expression Section, Laboratory of Molecular Carcinogenesis, National Institute of Environmental Health Sciences, 111 Alexander Drive, P.O. Box 12233 (MD C4-06), Research Triangle Park, NC 27709. Phone: (919) 316-4565. Fax: (919) 316-4566. E-mail: archer1{at}niehs.nih.gov.

Molecular and Cellular Biology, October 2005, p. 9016-9027, Vol. 25, No. 20
0022-538X/05/$08.00+0     doi:10.1128/MCB.25.20.9016-9027.2005




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