6u8i
BRD4-BD2 in complex with the cyclic peptide 3.2_2
Structural highlights
DiseaseBRD4_HUMAN Note=A chromosomal aberration involving BRD4 is found in a rare, aggressive, and lethal carcinoma arising in midline organs of young people. Translocation t(15;19)(q14;p13) with NUT which produces a BRD4-NUT fusion protein.[1] [2] FunctionBRD4_HUMAN Plays a role in a process governing chromosomal dynamics during mitosis (By similarity). Publication Abstract from PubMedCyclic peptide library screening technologies show immense promise for identifying drug leads and chemical probes for challenging targets. However, the structural and functional diversity encoded within such libraries is largely undefined. We have systematically profiled the affinity, selectivity, and structural features of library-derived cyclic peptides selected to recognize three closely related targets: the acetyllysine-binding bromodomain proteins BRD2, -3, and -4. We report affinities as low as 100 pM and specificities of up to 10(6)-fold. Crystal structures of 13 peptide-bromodomain complexes reveal remarkable diversity in both structure and binding mode, including both alpha-helical and beta-sheet structures as well as bivalent binding modes. The peptides can also exhibit a high degree of structural preorganization. Our data demonstrate the enormous potential within these libraries to provide diverse binding modes against a single target, which underpins their capacity to yield highly potent and selective ligands. Cyclic peptides can engage a single binding pocket through highly divergent modes.,Patel K, Walport LJ, Walshe JL, Solomon PD, Low JKK, Tran DH, Mouradian KS, Silva APG, Wilkinson-White L, Norman A, Franck C, Matthews JM, Guss JM, Payne RJ, Passioura T, Suga H, Mackay JP Proc Natl Acad Sci U S A. 2020 Oct 27;117(43):26728-26738. doi: , 10.1073/pnas.2003086117. Epub 2020 Oct 12. PMID:33046654[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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