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Disassembly of Transcriptional Regulatory Complexes by Molecular Chaperones
Brian C. Freeman,1Keith R. Yamamoto2*
Many biological processes are initiated by
cooperative assembly of large multicomponent complexes; however,
mechanisms formodulating or terminating the actions of these complexes
are notwell understood. For example, hormone-bound intracellular
receptors(IRs) nucleate formation of transcriptional regulatory
complexeswhose actions cease promptly upon hormone withdrawal. Here,
weshow that the p23 molecular chaperone localizes in vivo to genomicresponse elements in a hormone-dependent manner, disrupting
receptor-mediatedtranscriptional activation in vivo and in
vitro; Hsp90 weaklydisplayed similar activities. Indeed, p23 and Hsp90
also disruptedthe activities of some non-IR-containing
transcriptional regulatorycomplexes. We suggest that molecular
chaperones promote disassemblyof transcriptional regulatory complexes,
thus enabling regulatorymachineries to detect and respond to signaling
changes.
1 Department of Cell and Structural Biology,
University of Illinois, Urbana-Champaign, 601 South Goodwin Avenue,
Urbana, IL 61801, USA.
2 Department of Cellular and
Molecular Pharmacology, University of California, San Francisco, 513 Parnassus, San Francisco, CA 94143-0450, USA.
*
To whom correspondence should be addressed. E-mail:
yamamoto{at}cgl.ucsf.edu
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