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

Journal Article · · Nature Communications
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  1. Albert Einstein College of Medicine, Bronx, NY (United States)
  2. Stanford Univ., Menlo Park, CA (United States)
  3. Albert Einstein College of Medicine, Bronx, NY (United States); Rockefeller Univ., New York, NY (United States)

Here, 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.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1420044
Journal Information:
Nature Communications, Vol. 8, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (7)

Structure-function relationship of H2A-H2B specific plant histone chaperones journal November 2019
Structural insights into the ability of nucleoplasmin to assemble and chaperone histone octamers for DNA deposition journal July 2019
Newly developed Laboratory-based Size exclusion chromatography Small-angle x-ray scattering System (La-SSS) journal August 2019
Nucleoplasmin is a limiting component in the scaling of nuclear size with cytoplasmic volume journal October 2019
AtFKBP53: a chimeric histone chaperone with functional nucleoplasmin and PPIase domains journal December 2019
The Transcriptional Roles of ALK Fusion Proteins in Tumorigenesis journal July 2019
The Transcriptional Roles of ALK Fusion Proteins in Tumorigenesis. text January 2019

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