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SWI/SNF remodeling and p300‐dependent transcription of histone variant H2ABbd nucleosomal arrays
Author(s) -
Angelov Dimitar,
Verdel André,
An Woojin,
Bondarenko Vladimir,
Hans Fabienne,
Doyen CécileMarie,
Studitsky Vassily M,
Hamiche Ali,
Roeder Robert G,
Bouvet Philippe,
Dimitrov Stefan
Publication year - 2004
Publication title -
the embo journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 7.484
H-Index - 392
eISSN - 1460-2075
pISSN - 0261-4189
DOI - 10.1038/sj.emboj.7600400
Subject(s) - library science , biology , humanities , philosophy , computer science
A histone variant H2ABbd was recently identified, but its function is totally unknown. Here we have studied the structural and functional properties of nucleosome and nucleosomal arrays reconstituted with this histone variant. We show that H2ABbd can replace the conventional H2A in the nucleosome, but this replacement results in alterations of the nucleosomal structure. The remodeling complexes SWI/SNF and ACF are unable to mobilize the variant H2ABbd nucleosome. However, SWI/SNF was able to increase restriction enzyme access to the variant nucleosome and assist the transfer of variant H2ABbd–H2B dimer to a tetrameric histone H3–H4 particle. In addition, the p300‐ and Gal4‐VP16‐activated transcription appeared to be more efficient for H2ABbd nucleosomal arrays than for conventional H2A arrays. The intriguing mechanisms by which H2ABbd affects both nucleosome remodeling and transcription are discussed.