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J. Biol. Chem., Vol. 277, Issue 52, 50991-50995, December 27, 2002
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From the Laboratory of Molecular Biology, Cardiovascular Branch,
National Heart, Lung and Blood Institute, National Institutes of
Health, Bethesda, MD 20892
The nuclear co-activator PGC-1
Identification of a Specific Molecular Repressor of the
Peroxisome Proliferator-activated Receptor
Coactivator-1
(PGC-1
)*
,
, and
is a pivotal
regulator of numerous pathways controlling both metabolism and
overall energy homeostasis. Inappropriate increases in PGC-1
activity have been linked to a number of pathological conditions
including heart failure and diabetes mellitus. Previous studies
(Puigserver, P., Adelmant, G., Wu, Z., Fan, M., Xu, J., O'Malley, B.,
and Spiegelman, B. M. (1999) Science 286, 1368-1371)
have demonstrated an inhibitory domain within PGC-1
that limits
transcriptional activity. Using this inhibitory domain in a
yeast two-hybrid screen, we demonstrate that PGC-1
directly
associates with the orphan nuclear receptor estrogen-related
receptor-
(ERR-
). The binding of ERR-
to PGC-1
requires the
C-terminal AF2 domain of ERR-
. PGC-1
and ERR-
have a similar
pattern of expression in human tissues, with both being present
predominantly in organs with high metabolic needs such as skeletal
muscle and kidney. Similarly, we show that in mice physiological
stimuli such as fasting coordinately induces PGC-1
and ERR-
transcription. We also demonstrate that under normal conditions
PGC-1
is located within discrete nuclear speckles, whereas the
expression of ERR-
results in PGC-1
redistributing uniformly
throughout the nucleoplasm. Finally, we show that the expression of
ERR-
can dramatically and specifically repress PGC-1
transcriptional activity. These results suggest a novel mechanism of
transcriptional control wherein ERR-
can function as a specific
molecular repressor of PGC-1
activity. In addition, our
results suggest that other co-activators might also have specific repressors, thereby identifying another layer of combinatorial complexity in transcriptional regulation.
*
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.
These authors contributed equally to this work.
§
To whom correspondence should be addressed: National Institutes of
Health, Bldg. 10/6N-240, 10 Center Dr., Bethesda, MD 20892-1622. Tel.:
301-402-4081; Fax: 301-402-9311; E-mail: finkelt@nih.gov.
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