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J. Biol. Chem., Vol. 277, Issue 20, 17781-17788, May 17, 2002
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§, and
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From the Androgen receptor (AR)-interacting protein 3 (ARIP3/PIASx
Biomedicum Helsinki, Institute of
Biomedicine (Physiology), § Institute of Biotechnology, and
the ¶ Department of Clinical Chemistry, University of Helsinki and
Helsinki University Central Hospital, Helsinki FIN-00014, Finland
) is a coregulator capable of modulating transcriptional
activity of various steroid receptors. We have characterized functional regions of ARIP3 and studied its interaction with the glucocorticoid receptor (GR)-interacting protein 1 (GRIP1). We find that the potential
zinc-binding domain is critical for ARIP3 to function as a coactivator;
the deletion of amino acids 347-418 or the mutation of the conserved
cysteines 385 and 388 to serines converts ARIP3 to a transcriptional
repressor from AR-dependent minimal promoters and abolishes
its ability to activate GR. By contrast, mutations in the two
LXXLL motifs of ARIP3 have relatively minor effects on its
ability to regulate AR or GR function. ARIP3 is able to interact with
different regions of GRIP1, but the strongest interaction is detected
with the C-terminal region (amino acids 1122-1462) of GRIP1. The
interaction of ARIP3 with the latter GRIP1 domain or full-length GRIP1
and the ability of ARIP3 to cooperate with GRIP1 in the regulation of
AR- or GR-dependent transcription are dependent on the
ARIP3 zinc-binding region. We also find a strong synergism between
GRIP1 and two other PIAS family members, Miz1 and PIAS1. Taken
together, our results suggest that PIAS proteins and GRIP1 interact
functionally in transcriptional regulation.
To whom correspondence should be addressed: Biomedicum
Helsinki, Institute of Biomedicine, University of Helsinki, P.O. Box 63, FIN-00014 Helsinki, Finland. Tel.: 358-9-191-25040; Fax:
358-9-191-25047; E-mail: olli.janne@helsinki.fi.
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