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PMID: 9238002 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

RAC3, a steroid/nuclear receptor-associated coactivator that is related to SRC-1 and TIF2.

Li H, Gomes PJ, Chen JD

Abstract

Steroids, thyroid hormones, vitamin D3, and retinoids are lipophilic small molecules that regulate diverse biological effects such as cell differentiation, development, and homeostasis. The actions of these hormones are mediated by steroid/nuclear receptors which function as ligand-dependent transcriptional regulators. Transcriptional activation by ligand-bound receptors is a complex process requiring dissociation and recruitment of several additional cofactors. We report here the cloning and characterization of receptor-associated coactivator 3 (RAC3), a human transcriptional coactivator for steroid/nuclear receptors. RAC3 interacts with several liganded receptors through a mechanism which requires their respective ligand-dependent activation domains. RAC3 can activate transcription when tethered to a heterologous DNA-binding domain. Overexpression of RAC3 enhances the ligand-dependent transcriptional activation by the receptors in mammalian cells. Sequence analysis reveals that RAC3 is related to steroid receptor coactivator 1 (SRC-1) and transcriptional intermediate factor 2 (TIF2), two of the most potent coactivators for steroid/nuclear receptors. Thus, RAC3 is a member of a growing coactivator network that should be useful as a tool for understanding hormone action and as a target for developing new therapeutic agents that can block hormone-dependent neoplasia.

MeSH Terms
Amino Acid Sequence Animals Cell Line Cloning, Molecular Histone Acetyltransferases Humans Infant Molecular Sequence Data Nuclear Receptor Coactivator 1 Nuclear Receptor Coactivator 2 Nuclear Receptor Coactivator 3 Receptors, Steroid/metabolism Sequence Alignment Sequence Analysis Trans-Activators/genetics,metabolism Transcription Factors/genetics,metabolism Transfection
Chemicals
NCOA2 protein, human Nuclear Receptor Coactivator 2 Receptors, Steroid Trans-Activators Transcription Factors Histone Acetyltransferases NCOA1 protein, human Nuclear Receptor Coactivator 1 Nuclear Receptor Coactivator 3
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Li H
Department of Pharmacology and Molecular Toxicology, University of Massachusetts Medical School, 55 Lake Avenue North, Worcester, MA 01655-0126, USA.
Gomes P J
Chen J D
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
1997-08-05
Pages
8479-84
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC22964
Subset
IM
Databases
GENBANK
AF010227
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