2VTX

ACTIVATION OF NUCLEOPLASMIN, AN OLIGOMERIC HISTONE CHAPERONE, CHALLENGES ITS STABILITY


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.182 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Activation of Nucleoplasmin, an Oligomeric Histone Chaperone, Challenges its Stability.

Taneva, S.G.Munoz, I.G.Franco, G.Falces, J.Arregi, I.Muga, A.Montoya, G.Urbaneja, M.A.Banuelos, S.

(2008) Biochemistry 47: 13897

  • DOI: 10.1021/bi800975r

  • PubMed Abstract: 
  • Nucleoplasmin (NP) is a pentameric, ring-shaped histone chaperone involved in chromatin remodeling processes such as sperm decondensation at fertilization. Monomers are formed by a core domain, responsible for oligomerization, that confers the protei ...

    Nucleoplasmin (NP) is a pentameric, ring-shaped histone chaperone involved in chromatin remodeling processes such as sperm decondensation at fertilization. Monomers are formed by a core domain, responsible for oligomerization, that confers the protein a high stability and compactness and a flexible tail domain, that harbors a polyglutamic tract and the nuclear localization signal. Fully activated NP presents multiple phosphorylated residues in the tail and in flexible regions of the core domain. In this work, we analyze the effect of activation on the structure and stability of the full-length protein and the isolated core domain through phosphorylation mimicking mutations. We have solved the crystal structure of an activated NP core domain that, however, is not significantly different from that of the wild-type,inactive, NP core. Nevertheless, we find that NP activation results in a strong destabilization of the pentamer probably due to electrostatic repulsion. Moreover, characterization of the hydrodynamic properties of both full-length and core domain proteins indicates that activating mutations lead to an expansion of the NP pentamer in solution. These findings suggest that NP needs a compact and stable structure to afford the accumulation of negative charges that weakens its quaternary interactions but is required for its biological function.


    Organizational Affiliation

    Unidad de Biofísica (CSIC-UPV/EHU) and Dpto. de Bioquímica y Biología Molecular, UniVersidad del País Vasco, P.O. Box644, 48080 Bilbao, Spain.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
NPM-A PROTEIN
A, B, C, D, E, G, H, I, K
120Xenopus laevisMutation(s): 8 
Find proteins for P05221 (Xenopus laevis)
Go to UniProtKB:  P05221
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
NPM-A PROTEIN
J
120Xenopus laevisMutation(s): 8 
Find proteins for P05221 (Xenopus laevis)
Go to UniProtKB:  P05221
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.269 
  • R-Value Work: 0.182 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 67.034α = 90.00
b = 94.601β = 90.00
c = 176.100γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
EPMRphasing
REFMACrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-12-16
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance