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Title: Structure of human nucleosome containing the testis-specific histone variant TSH2B

The crystal structure of human nucleosome containing the testis-specific TSH2B variant has been determined. The TSH2B Ser85 residue does not interact with H4 in the nucleosome, and induces a local structural difference between TSH2B and H2B in nucleosomes. The human histone H2B variant TSH2B is highly expressed in testis and may function in the chromatin transition during spermatogenesis. In the present study, the crystal structure of the human testis-specific nucleosome containing TSH2B was determined at 2.8 Å resolution. A local structural difference between TSH2B and canonical H2B in nucleosomes was detected around the TSH2B-specific amino-acid residue Ser85. The TSH2B Ser85 residue does not interact with H4 in the nucleosome, but in the canonical nucleosome the H2B Asn84 residue (corresponding to the TSH2B Ser85 residue) forms water-mediated hydrogen bonds with the H4 Arg78 residue. In contrast, the other TSH2B-specific amino-acid residues did not induce any significant local structural changes in the TSH2B nucleosome. These findings may provide important information for understanding how testis-specific histone variants form nucleosomes during spermatogenesis.
Authors:
; ; ; ;  [1]
  1. Waseda University, 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480 (Japan)
Publication Date:
OSTI Identifier:
22375684
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta crystallographica. Section F, Structural biology communications; Journal Volume: 70; Journal Issue: Pt 4; Other Information: PMCID: PMC3976059; PMID: 24699735; PUBLISHER-ID: tt5048; OAI: oai:pubmedcentral.nih.gov:3976059; Copyright (c) Urahama et al. 2014; This is an open-access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CRYSTAL STRUCTURE; HYDROGEN; RESOLUTION; WATER