Transcriptional activity relies on coregulators that modify chromatin structure or serve as bridging factors between transcription factors and the basal transcription machinery. We identified a new coregulator of peroxisome proliferator-activated receptor gamma, BRG1/Brm-associated factor of 60 kDa, subunit c2 (BAF60c2), in a yeast two-hybrid screen of a human adipose tissue cDNA library. BAF60c2 represents a new isoform of BAF60c, a component of the SWI/SNF (mating type switching/sucrose non-fermenting) chromatin remodeling complex. This new isoform as well as the previously identified protein, renamed BAF60c1, is localized primarily in the cell nucleus and is expressed in a wide variety of tissues. Both BAF60c isoforms bind to several nuclear receptors and transcription factors of various families. BAF60c proteins interact in a ligand-independent manner with peroxisome proliferator-activated receptor gamma and enhance its transcriptional activity. Both isoforms are enriched in the central nervous system and also modulate the transcriptional activity of retinoic acid-related orphan receptor alpha1. In conclusion, BAF60c represents a new coregulator that constitutes an important anchoring point by which the SWI/SNF complex is recruited to nuclear receptors and other transcription factors.
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