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Histone Sin mutations promote nucleosome traversal and histone displacement by RNA polymerase II
Author(s) -
Hsieh FuKai,
Fisher Michael,
Újvári Andrea,
Studitsky Vasily M,
Luse Donal S
Publication year - 2010
Publication title -
embo reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.584
H-Index - 184
eISSN - 1469-3178
pISSN - 1469-221X
DOI - 10.1038/embor.2010.113
Subject(s) - histone , nucleosome , chromatin , biology , microbiology and biotechnology , rna polymerase ii , transcription (linguistics) , genetics , gene expression , dna , gene , promoter , linguistics , philosophy
Nucleosome traversal by RNA polymerase II (pol II) and recovery of chromatin structure after transcription are essential for proper gene expression. In this paper we show that nucleosomes assembled with Sin mutant histones present a much weaker barrier to traversal by pol II and are less likely to survive transcription. Increases in traversal from incorporation of Sin mutant histones and histones lacking H2A/H2B amino‐terminal tails were in most cases additive, indicating that traversal can be facilitated by distinct mechanisms. We had identified a key intermediate in traversal, the zero (∅)‐loop, which mediates nucleosome survival during transcription. Sin mutations probably destabilize these intermediates and thus increase the likelihood of nucleosome disassociation.