2Z2R

Nucleosome assembly proteins I (NAP-1, 74-365)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.260 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A beta-hairpin comprising the nuclear localization sequence sustains the self-associated states of nucleosome assembly protein 1

Park, Y.J.McBryant, S.J.Luger, K.

(2008) J.Mol.Biol. 375: 1076-1085

  • DOI: 10.1016/j.jmb.2007.11.031

  • PubMed Abstract: 
  • The histone chaperone nucleosome assembly protein 1 (NAP1) is implicated in histone shuttling as well as nucleosome assembly and disassembly. Under physiological conditions, NAP1 dimers exist in a mixture of various high-molecular-weight oligomers wh ...

    The histone chaperone nucleosome assembly protein 1 (NAP1) is implicated in histone shuttling as well as nucleosome assembly and disassembly. Under physiological conditions, NAP1 dimers exist in a mixture of various high-molecular-weight oligomers whose size may be regulated by the cell cycle-dependent concentration of NAP1. Both the functional and structural significance of the observed oligomers are unknown. We have resolved the molecular mechanism by which yeast NAP1 (yNAP1) dimers oligomerize by applying x-ray crystallographic, hydrodynamic, and functional approaches. We found that an extended beta-hairpin that protrudes from the compact core of the yNAP1 dimer forms a stable beta-sheet with beta-hairpins of neighboring yNAP1 dimers. Disruption of the beta-hairpin (whose sequence is conserved among NAP1 proteins in various species) by the replacement of one or more amino acids with proline results in complete loss of yNAP1 dimer oligomerization. The in vitro functions of yNAP1 remain unaffected by the mutations. We have thus identified a conserved structural feature of NAP1 whose function, in addition to presenting the nuclear localization sequence, appears to be the formation of higher-order oligomers.


    Organizational Affiliation

    Howard Hughes Medical Institute and Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, CO 80523-1870, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Nucleosome assembly protein
A, B
292Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Mutation(s): 0 
Gene Names: NAP1
Find proteins for P25293 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P25293
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.260 
  • Space Group: P 42 21 2
Unit Cell:
Length (Å)Angle (°)
a = 125.000α = 90.00
b = 125.000β = 90.00
c = 146.670γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data collection
CNSrefinement
CNSphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2007-05-25 
  • Released Date: 2008-03-11 
  • Deposition Author(s): Park, Y.J., Luger, K.

Revision History 

  • Version 1.0: 2008-03-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Derived calculations, Version format compliance