2rvq

Solution structure of the isolated histone H2A-H2B heterodimer

spinqualitylabelsall models 2rvq, 10 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2rvq is a 2 chain structure with sequence from Human. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: HIST1H2AB, H2AFM, HIST1H2AE, H2AFA (HUMAN), HIST1H2BJ, H2BFR (HUMAN) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [H2B1J_HUMAN] Core component of nucleosome. Nucleosomes wrap and compact DNA into chromatin, limiting DNA accessibility to the cellular machineries which require DNA as a template. Histones thereby play a central role in transcription regulation, DNA repair, DNA replication and chromosomal stability. DNA accessibility is regulated via a complex set of post-translational modifications of histones, also called histone code, and nucleosome remodeling. Has broad antibacterial activity. May contribute to the formation of the functional antimicrobial barrier of the colonic epithelium, and to the bactericidal activity of amniotic fluid. Publication Abstract from PubMed During chromatin-regulated processes, the histone H2A-H2B heterodimer functions dynamically in and out of the nucleosome. Although detailed crystal structures of nucleosomes have been established, that of the isolated full-length H2A-H2B heterodimer has remained elusive. Here, we have determined the solution structure of human H2A-H2B by NMR coupled with CS-Rosetta. H2A and H2B each contain a histone fold, comprising four alpha-helices and two beta-strands (alpha1-beta1-alpha2-beta2-alpha3-alphaC), together with the long disordered N- and C-terminal H2A tails and the long N-terminal H2B tail. The N-terminal alphaN helix, C-terminal beta3 strand, and 310 helix of H2A observed in the H2A-H2B nucleosome structure are disordered in isolated H2A-H2B. In addition, the H2A alpha1 and H2B alphaC helices are not well fixed in the heterodimer, and the H2A and H2B tails are not completely random coils. Comparison of hydrogen-deuterium exchange, fast hydrogen exchange, and {(1)H}-(15)N hetero-nuclear NOE data with the CS-Rosetta structure indicates that there is some conformation in the H2A 310 helical and H2B Lys11 regions, while the repression domain of H2B (residues 27-34) exhibits an extended string-like structure. This first structure of the isolated H2A-H2B heterodimer provides insight into its dynamic functions in chromatin. Solution structure of the isolated histone H2A-H2B heterodimer.,Moriwaki Y, Yamane T, Ohtomo H, Ikeguchi M, Kurita J, Sato M, Nagadoi A, Shimojo H, Nishimura Y Sci Rep. 2016 May 16;6:24999. doi: 10.1038/srep24999. PMID:27181506 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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