INO80 exchanges H2A.Z for H2A by translocating on DNA proximal to histone dimers.

作者：Brahma Sandipan; Udugama Maheshi I; Kim Jongseong; Hada Arjan; Bhardwaj Saurabh K; Hailu Solomon G; Lee Tae Hee; Bartholomew Blaine

来源：Nature Communications, 2017, 8: 15616-15616.

DOI：10.1038/ncomms15616

ATP-dependent chromatin remodellers modulate nucleosome dynamics by mobilizing or disassembling nucleosomes, as well as altering nucleosome composition. These chromatin remodellers generally function by translocating along nucleosomal DNA at the H3-H4 interface of nucleosomes. Here we show that, unlike other remodellers, INO80 translocates along DNA at the H2A-H2B interface of nucleosomes and persistently displaces DNA from the surface of H2A-H2B. DNA translocation and DNA torsional strain created near the entry site of nucleosomes by INO80 promotes both the mobilization of nucleosomes and the selective exchange of H2A.Z-H2B dimers out of nucleosomes and replacement by H2A-H2B dimers without any additional histone chaperones. We find that INO80 translocates and mobilizes H2A.Z-containing nucleosomes more efficiently than those containing H2A, partially accounting for the preference of INO80 to replace H2A.Z with H2A. Our data suggest that INO80 has a mechanism for dimer exchange that is distinct from other chromatin remodellers including its paralogue SWR1.

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  University of Texas, MD Anderson Cancer Center; The University of Texas, MD Anderson Cancer Center; University of Texas MD Anderson Cancer Center; UNIVERSITY OF TEXAS MD ANDERSON CANCER CENTER; The University of Texas MD Anderson Cancer Center; Southern Illinois University; The Pennsylvania State University, University Park; the university of Texas MD Anderson Cancer Center; University of Texas, M.D. Anderson Cancer Center; University of Texas,M.D.Anderson Cancer Center; University of Texas M.D.Anderson cancer center; University Of Texas MD Anderson Cancer Center; The University of Texas M.D Anderson Cancer Center; University of Texas M.D.Anderson Cancer Center; University of Texas M. D. Anderson Cancer Center; The university of Texas,M.D.Anderson Cancer Center; The University of Texas M.D anderson Cancer Center; The University of Texas M.D.Anderson Cancer Center