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Dynamic intramolecular regulation of the histone chaperone nucleoplasmin controls histone binding and release.

Abstract：

:Nucleoplasmin (Npm) is a highly conserved histone chaperone responsible for the maternal storage and zygotic release of histones H2A/H2B. Npm contains a pentameric N-terminal core domain and an intrinsically disordered C-terminal tail domain. Though intrinsically disordered regions are common among histone chaperones, their roles in histone binding and chaperoning remain unclear. Using an NMR-based approach, here we demonstrate that the Xenopus laevis Npm tail domain controls the binding of histones at its largest acidic stretch (A2) via direct competition with both the C-terminal basic stretch and basic nuclear localization signal. NMR and small-angle X-ray scattering (SAXS) structural analyses allowed us to construct models of both the tail domain and the pentameric complex. Functional analyses demonstrate that these competitive intramolecular interactions negatively regulate Npm histone chaperone activity in vitro. Together these data establish a potentially generalizable mechanism of histone chaperone regulation via dynamic and specific intramolecular shielding of histone interaction sites.

journal_name

Nat Commun

journal_title

Nature communications

authors

Warren C,Matsui T,Karp JM,Onikubo T,Cahill S,Brenowitz M,Cowburn D,Girvin M,Shechter D

doi

10.1038/s41467-017-02308-3

subject

Has Abstract

pub_date

2017-12-20 00:00:00

pages

2215

issue

1

issn

2041-1723

pii

10.1038/s41467-017-02308-3

journal_volume

8

pub_type

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