Nucleic Acids Research, Vol 25, Issue 16 3318-3325, Copyright © 1997 by Oxford University Press
Z Sun, J Pan and SP Balk
An increasing number of proteins which bind to hormone-dependent nuclear
receptors and mediate their effects on gene expression are being
identified. The human prostate-specific antigen (PSA) and kallikrein 2
(KLK2) genes are regulated by the androgen receptor (AR). Using
electrophoresis mobility shift assays (EMSA), a common nuclear protein(s)
which binds upstream of the androgen-responsive elements (AREs) in the PSA
and KLK2 promoters was identified. Binding occurred between bp -539 and
-399 and bp -349 and -224 in the PSA and KLK2 promoters respectively, which
were shown previously to be necessary for AR-mediated transactivation.
Glutathione S-transferase (GST)-AR fusion proteins were constructed to
determine whether the AR interacted directly with this protein or protein
complex. Specific interactions were observed with AR fusion proteins
containing the DNA binding domain. EMSA supershift experiments and GST-AR
pull-down experiments followed by Western blotting identified a Fos-related
protein(s) of approximately 40 kDa as part of this complex. Competition
experiments with a double-stranded oligonucleotide containing an AP-1
binding site demonstrated that DNA binding was not mediated by AP-1. These
results indicate that a Fos-containing protein complex distinct from AP-1
binds upstream of the AREs in the PSA and KLK2 promoters, interacts with
the AR and may participate in regulation of these two androgen-responsive
genes.
ARTICLES
Androgen receptor-associated protein complex binds upstream of the androgen-responsive elements in the promoters of human prostate- specific antigen and kallikrein 2 genes
Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA. zsun@bih.harvard.edu
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