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Volume 272, Number 50, Issue of December 12, 1997
pp. 31465-31474
Chicken Ovalbumin Upstream Promoter-Transcription Factor
Interacts with Estrogen Receptor, Binds to Estrogen Response Elements
and Half-Sites, and Inhibits Estrogen-induced Gene Expression
(Received for publication, June 24, 1997, and in revised form, September 19, 1997)
Carolyn M.
Klinge
,
Bethany F.
Silver
,
Mark D.
Driscoll
¶
,
Ganesan
Sathya
¶
,
Robert A.
Bambara
¶
and
Russell
Hilf
¶
From the Department of Biochemistry and Molecular
Biology, University of Louisville School of Medicine,
Louisville, Kentucky 40292 and the ¶ Department of Biochemistry,
University of Rochester School of Medicine,
Rochester, New York 14642
Chicken ovalbumin upstream promoter-transcription
factor (COUP-TF) was identified as a low abundance protein in bovine
uterus that co-purified with estrogen receptor (ER) in a
ligand-independent manner and was separated from the ER by its lower
retention on estrogen response element (ERE)-Sepharose. In gel mobility
shift assays, COUP-TF bound as an apparent dimer to ERE and ERE
half-sites. COUP-TF bound to an ERE half-site with high affinity,
Kd = 1.24 nM. In contrast, ER did not
bind a single ERE half-site. None of the class II nuclear receptors
analyzed, i.e. retinoic acid receptor, retinoid X receptor,
thyroid receptor, peroxisome proliferator-activated receptor, or
vitamin D receptor, were constituents of the COUP-TF·DNA binding
complex detected in gel mobility shift assays. Direct interaction of
COUP-TF with ER was indicated by GST "pull-down" and
co-immunoprecipitation assays. The nature of the ER ligand influenced
COUP-TF-ERE half-site binding. When ER was liganded by the antiestrogen
4-hydroxytamoxifen (4-OHT), COUP-TF-half-site interaction decreased.
Conversely, COUP-TF transcribed and translated in vitro
enhanced the ERE binding of purified estradiol (E2)-liganded ER but not 4-OHT-liganded ER. Co-transfection
of ER-expressing MCF-7 human breast cancer cells with an expression vector for COUP-TFI resulted in a dose-dependent inhibition
of E2-induced expression of a luciferase reporter gene
under the control of three tandem copies of EREc38. The ability of
COUP-TF to bind specifically to EREs and half-sites, to interact with ER, and to inhibit E2-induced gene expression suggests
COUP-TF regulates ER action by both direct DNA binding competition and through protein-protein interactions.

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Copyright © 1997 by the American Society for Biochemistry and Molecular Biology.
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