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J. Biol. Chem., Vol. 277, Issue 44, 41674-41685, November 1, 2002
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From the The mammalian SWI/SNF-related complexes
facilitate gene transcription by remodeling chromatin using the energy
of ATP hydrolysis. The recruitment of these complexes to promoters
remains poorly understood and may involve histone modifications or
direct interactions with site-specific transcription factors or other
cofactors. Here we report the isolation of two related but distinct
cDNA clones, hOsa1 and hOsa2, that encode the largest subunits of
human SWI/SNF. hOsa1 is identical to previously reported BAF250, and
hOsa2 shares a high degree of sequence similarity with hOsa1. Mass
spectrometric analysis, and immunoblotting with antibodies specific to
hOsa1 or hOsa2 demonstrate the presence of both proteins in SWI/SNF-A but not in the related polybromo-BRG1-associated factors complex purified from HeLa cells. Co-precipitation studies indicate that hOsa1
and hOsa2 associate with BRG1 and hBRM through the C-terminal domain of
hOsa. We define multiple domains within hBRM and BRG1 that interact
with the hOsa C terminus. In cultured mammalian cells, hOsa1 and hOsa2
stimulate transcription by the glucocorticoid, estrogen, and androgen
receptors. The glucocorticoid receptor-mediated activation is not
observed with the C-terminal domain or with the hOsa2 polypeptide
lacking the ARID DNA binding domain. These results suggest that hOsa1
and hOsa2 participate in promoting transcriptional activation by the
steroid hormone receptors.
The nucleotide sequence(s) reported in this paper has been submitted to the GenBankTM/EBI Data Bank with accession number(s) AF521670 and AF521671.
Largest Subunits of the Human SWI/SNF Chromatin-remodeling
Complex Promote Transcriptional Activation by Steroid Hormone
Receptors*
§,
§¶,
,
,
, and
**
Department of Microbiology and Kaplan Cancer
Center, New York University School of Medicine, New York, New York
10016-6481 and the
Department of Molecular and Cell Biology,
Howard Hughes Medical Institute, University of California,
Berkeley, California 94720-3204
*
This work was supported in part by American Cancer Society
Grant RSG-01-248-01-CCE. Computing Resources was supported by National Science Foundation Grant BIR-9318128.The costs of publication of this
article were defrayed in part by the
payment of page charges. The article
must therefore be hereby marked
"advertisement" in accordance with 18 U.S.C. Section
1734 solely to indicate this fact.
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