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ASF1 binds to a heterodimer of histones H3 and H4: A two-step mechanism for the assembly of the H3-H4 heterotetramer on DNA

Biochemistry, ISSN: 0006-2960, Vol: 44, Issue: 42, Page: 13673-13682
2005
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Article Description

The first step in the formation of the nucleosome is commonly assumed to be the deposition of a histone H3-H4 heterotetramer onto DNA. Antisilencing function 1 (ASF1) is a major histone H3-H4 chaperone that deposits histones H3 and H4 onto DNA. With a goal of understanding the mechanism of deposition of histones H3 and H4 onto DNA, we have determined the stoichiometry of the Asf1-H3-H4 complex. We have established that a single molecule of Asf1 binds to an H3-H4 heterodimer using gel filtration, amino acid, reversed-phase chromatography, and analytical ultracentrifugation analyses. We demonstrate that Asf1 blocks formation of the H3-H4 heterotetramer by a mechanism that likely involves occlusion of the H3-H3 dimerization interface. © 2005 American Chemical Society.

Bibliographic Details

English, Christine M; Maluf, Nasib K; Tripet, Brian; Churchill, Mair E A; Tyler, Jessica K

American Chemical Society (ACS)

Biochemistry, Genetics and Molecular Biology

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