Shearing of the CENP-A dimerization interface mediates plasticity in the octameric centromeric nucleosome.

Abstract:

:The centromeric nucleosome is a key epigenetic determinant of centromere identity and function. Consequently, deciphering how CENP-A containing nucleosomes contribute structurally to centromere function is a fundamental question in chromosome biology. Here, we performed microsecond timescale all-atom molecular dynamics (MD) simulations of CENP-A and H3 nucleosomes, and report that the octameric CENP-A core particles and nucleosomes display different dynamics from their canonical H3-containing counterparts. The most significant motion observed is within key interactions at the heart of the CENP-A octameric core, wherein shearing of contacts within the CENP-A:CENP-A' dimerization interface results in a weaker four helix bundle, and an extrusion of 10-30 bp of DNA near the pseudo-dyad. Coupled to other local and global fluctuations, the CENP-A nucleosome occupies a more rugged free energy landscape than the canonical H3 nucleosome. Taken together, our data suggest that CENP-A encodes enhanced distortability to the octameric nucleosome, which may allow for enhanced flexing of the histone core in vivo.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Winogradoff D,Zhao H,Dalal Y,Papoian GA

doi

10.1038/srep17038

subject

Has Abstract

pub_date

2015-11-25 00:00:00

pages

17038

issn

2045-2322

pii

srep17038

journal_volume

5

pub_type

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