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Mol. Cell. Biol., Oct 1996, 5458-5465, Vol 16, No. 10
I Zamir, HP Harding, GB Atkins, A Horlein, CK Glass, MG Rosenfeld and MA Lazar
Ligand-independent transcriptional repression is an important function of
nuclear hormone receptors. An interaction screen with the repression domain
of the orphan receptor RevErb identified N-CoR, the corepressor for thyroid
hormone receptor (TR) and retinoic acid receptor (RAR). N- CoR is likely to
be a bona fide transcriptional corepressor for RevErb because (i) RevErb
interacts with endogenous N-CoR, (ii) ectopic N-CoR potentiates
RevErb-mediated repression, and (iii) transcriptional repression by RevErb
correlates with its ability to bind N-CoR. Remarkably, a region homologous
to the CoR box which is necessary for TR and RAR to interact with N-CoR is
not required for RevErb. Rather, two short regions of RevErb separated by
approximately 200 amino acids are required for interaction with N-CoR. The
primary amino acid sequence of the N-terminal region of RevErb essential
for N-CoR interaction is not homologous to that of TR or RAR, whereas
similarities exist among the C-terminal domains of the receptors. N-CoR
contains two adjacent but distinct interaction domains, one of which binds
tightly to both RevErb and TR whereas the other binds more weakly and
differentially interacts with the nuclear receptors. These results indicate
that multiple nuclear receptors, utilizing different primary amino acid
sequences, repress transcription by interacting with N-CoR.
Copyright © 1996, American Society for Microbiology
A nuclear hormone receptor corepressor mediates transcriptional silencing by receptors with distinct repression domains
Department of Medicine, University of Pennsylvania School of Medicine, Philadelphia 19104, USA.
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