Journal
NATURE STRUCTURAL & MOLECULAR BIOLOGY
Volume 17, Issue 7, Pages 808-U51Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nsmb.1860
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Funding
- US National Institutes of Health [DK45586]
- Penn-GlaxoSmithKline Academic Drug Discovery Initiative
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Repression of gene transcription by the nuclear receptor Rev-erb alpha plays an integral role in the core molecular circadian clock. We report the crystal structure of a nuclear receptor-co-repressor (N-CoR) interaction domain 1 (ID1) peptide bound to truncated human Rev-erb alpha ligand-binding domain (LBD). The ID1 peptide forms an unprecedented antiparallel beta-sheet with Rev-erb alpha, as well as an alpha-helix similar to that seen in nuclear receptor ID2 crystal structures but out of register by four residues. Comparison with the structure of Rev-erb beta bound to heme indicates that ID1 peptide and heme induce substantially different conformational changes in the LBD. Although heme is involved in Rev-erb repression, the structure suggests that Rev-erb alpha could also mediate repression via ID1 binding in the absence of heme. The previously uncharacterized secondary structure induced by ID1 peptide binding advances our understanding of nuclear receptor-co-repressor interactions.
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