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The SWI/SNF complex participates as a co-activator in the transcriptional regulation of certain genes. Conversely, we and others have recently established that Brg1 and Brm, the central components of SWI/SNF, act instead as co-repressors for E2F-mediated transcriptional repression, and for the transcription of certain other promoters. We report here that Brg-1 and Brm can switch their mode of function at same promoter between activation and repression by ligand-directed differential coordination with BAF155, BAF170, HDAC1, p300 and prohibitin. This ligand and context-dependent reprogramming of the SWI/SNF complex allows it to differentially serve as either a co-repressor or a co-activator of transcription at th... More
