Structural and Biochemical Analyses of Monoubiquitinated Human Histones H2B and H4

Overview

Journal Open Biol

Specialties Biology
Cell Biology
Molecular Biology

Date 2016 Jun 24

PMID 27335322

Citations 16

Authors

Shinichi Machida

Satoshi Sekine

Yuuki Nishiyama

Naoki Horikoshi

Hitoshi Kurumizaka

Affiliations

Soon will be listed here.

Abstract

Monoubiquitination is a major histone post-translational modification. In humans, the histone H2B K120 and histone H4 K31 residues are monoubiquitinated and may form transcriptionally active chromatin. In this study, we reconstituted nucleosomes containing H2B monoubiquitinated at position 120 (H2Bub120) and/or H4 monoubiquitinated at position 31 (H4ub31). We found that the H2Bub120 and H4ub31 monoubiquitinations differently affect nucleosome stability: the H2Bub120 monoubiquitination enhances the H2A-H2B association with the nucleosome, while the H4ub31 monoubiquitination decreases the H3-H4 stability in the nucleosome, when compared with the unmodified nucleosome. The H2Bub120 and H4ub31 monoubiquitinations both antagonize the Mg(2+)-dependent compaction of a poly-nucleosome, suggesting that these monoubiquitinations maintain more relaxed conformations of chromatin. In the crystal structure, the H2Bub120 and H4ub31 monoubiquitinations do not change the structure of the nucleosome core particle and the ubiquitin molecules were flexibly disordered in the H2Bub120/H4ub31 nucleosome structure. These results revealed the differences and similarities of the H2Bub120 and H4ub31 monoubiquitinations at the mono- and poly-nucleosome levels and provide novel information to clarify the roles of monoubiquitination in chromatin.

Citing Articles

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Histone H2B ubiquitylation: Connections to transcription and effects on chromatin structure.

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