8h1t

Cryo-EM structure of BAP1-ASXL1 bound to chromatosome

spinqualitylabelsall models 8h1t, resolution 3.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8h1t is a 14 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function H31_HUMAN Publication Abstract from PubMed Repression of gene expression by protein complexes of the Polycomb group is a fundamental mechanism that governs embryonic development and cell-type specification(1-3). The Polycomb repressive deubiquitinase (PR-DUB) complex removes the ubiquitin moiety from monoubiquitinated histone H2A K119 (H2AK119ub1) on the nucleosome(4), counteracting the ubiquitin E3 ligase activity of Polycomb repressive complex 1 (PRC1)(5) to facilitate the correct silencing of genes by Polycomb proteins and safeguard active genes from inadvertent silencing by PRC1 (refs. (6-9)). The intricate biological function of PR-DUB requires accurate targeting of H2AK119ub1, but PR-DUB can deubiquitinate monoubiquitinated free histones and peptide substrates indiscriminately; the basis for its exquisite nucleosome-dependent substrate specificity therefore remains unclear. Here we report the cryo-electron microscopy structure of human PR-DUB, composed of BAP1 and ASXL1, in complex with the chromatosome. We find that ASXL1 directs the binding of the positively charged C-terminal extension of BAP1 to nucleosomal DNA and histones H3-H4 near the dyad, an addition to its role in forming the ubiquitin-binding cleft. Furthermore, a conserved loop segment of the catalytic domain of BAP1 is situated near the H2A-H2B acidic patch. This distinct nucleosome-binding mode displaces the C-terminal tail of H2A from the nucleosome surface, and endows PR-DUB with the specificity for H2AK119ub1. Basis of the H2AK119 specificity of the Polycomb repressive deubiquitinase.,Ge W, Yu C, Li J, Yu Z, Li X, Zhang Y, Liu CP, Li Y, Tian C, Zhang X, Li G, Zhu B, Xu RM Nature. 2023 Apr;616(7955):176-182. doi: 10.1038/s41586-023-05841-y. Epub 2023 , Mar 29. PMID:36991118 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Histone 3D structures 3D structures of ubiquitin

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