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The Specificity of Interactions between Nuclear Hormone Receptors and Corepressors Is Mediated by Distinct Amino Acid Sequences within the Interacting Domains

Section of Endocrinology (R.N.C., F.E.W.) Department of Medicine University of Chicago Chicago, Illinois 60637
Thyroid Unit (S.B., B.K., A.N.H.) Division of Endocrinology and Division of Bone and Mineral Metabolism (M.C.) Beth Israel Deaconess Medical Center Boston, Massachusetts 02215

The thyroid hormone receptor (TR) and retinoic acid receptor (RAR) isoforms interact with the nuclear corepressors [NCoR (nuclear corepressor protein) and SMRT (silencing mediator for retinoid and thyroid hormone receptors)] in the absence of ligand to silence transcription. NCoR and SMRT contain C-terminal nuclear hormone receptor (NHR) interacting domains that each contain variations of the consensus sequence I/L-x-x-I/V-I (CoRNR box). We have previously demonstrated that TRß1 preferentially interacts with NCoR, whereas RAR prefers SMRT. Here, we demonstrate that this is due, in part, to the presence of a novel NCoR interacting domain, termed N3, upstream of the previously described domains. An analogous domain is not present in SMRT. This domain is specific for TR and interacts poorly with RAR. Our data suggest that the presence of two corepressor interacting domains are necessary for full interactions with nuclear receptors in cells. Interestingly, mutation of N3 alone specifically decreases binding of NCoR to TR in cells but does not decrease NCoR-RAR interactions. In addition, while the exact CoRNR box sequence of a SMRT interacting domain is critical for recruitment of SMRT by RAR, the CoRNR box sequences themselves do not explain the strong interaction of the N2 domain with TRß1. Additional regions distal to the CoRNR box sequence are needed for optimal binding. Thus, through sequence differences in known interacting domains and the presence of a newly identified interacting domain, NCoR is able to preferentially bind TRß1. These preferences are likely to be important in corepressor action in vivo.

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