Structural basis of a nucleosome containing histone H2A.B/H2A.Bbd that transiently associates with reorganized chromatin

Yasuhiro Arimura, Hiroshi Kimura*, Takashi Oda, Koichi Sato, Akihisa Osakabe, Hiroaki Tachiwana, Yuko Sato, Yasuha Kinugasa, Tsuyoshi Ikura, Masaaki Sugiyama, Mamoru Sato, Hitoshi Kurumizaka

*この研究の対応する著者

研究成果: Article査読

42 被引用数 (Scopus)

抄録

Human histone H2A.B (formerly H2A.Bbd), a non-allelic H2A variant, exchanges rapidly as compared to canonical H2A, and preferentially associates with actively transcribed genes. We found that H2A.B transiently accumulated at DNA replication and repair foci in living cells. To explore the biochemical function of H2A.B, we performed nucleosome reconstitution analyses using various lengths of DNA. Two types of H2A.B nucleosomes, octasome and hexasome, were formed with 116, 124, or 130 base pairs (bp) of DNA, and only the octasome was formed with 136 or 146 bp DNA. In contrast, only hexasome formation was observed by canonical H2A with 116 or 124 bp DNA. A small-angle X-ray scattering analysis revealed that the H2A.B octasome is more extended, due to the flexible detachment of the DNA regions at the entry/exit sites from the histone surface. These results suggested that H2A.B rapidly and transiently forms nucleosomes with short DNA segments during chromatin reorganization.

本文言語English
論文番号3510
ジャーナルScientific Reports
3
DOI
出版ステータスPublished - 2013 12月 16
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ASJC Scopus subject areas

  • 一般

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