4IYP

structure of the nPP2Ac-alpha4 complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.797 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.179 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis of protein phosphatase 2A stable latency.

Jiang, L.Stanevich, V.Satyshur, K.A.Kong, M.Watkins, G.R.Wadzinski, B.E.Sengupta, R.Xing, Y.

(2013) Nat Commun 4: 1699-1699

  • DOI: 10.1038/ncomms2663

  • PubMed Abstract: 
  • The catalytic subunit of protein phosphatase 2A (PP2Ac) is stabilized in a latent form by α4, a regulatory protein essential for cell survival and biogenesis of all PP2A complexes. Here we report the structure of α4 bound to the N-terminal fragment o ...

    The catalytic subunit of protein phosphatase 2A (PP2Ac) is stabilized in a latent form by α4, a regulatory protein essential for cell survival and biogenesis of all PP2A complexes. Here we report the structure of α4 bound to the N-terminal fragment of PP2Ac. This structure suggests that α4 binding to the full-length PP2Ac requires local unfolding near the active site, which perturbs the scaffold subunit binding site at the opposite surface via allosteric relay. These changes stabilize an inactive conformation of PP2Ac and convert oligomeric PP2A complexes to the α4 complex upon perturbation of the active site. The PP2Ac-α4 interface is essential for cell survival and sterically hinders a PP2A ubiquitination site, important for the stability of cellular PP2Ac. Our results show that α4 is a scavenger chaperone that binds to and stabilizes partially folded PP2Ac for stable latency, and reveal a mechanism by which α4 regulates cell survival, and biogenesis and surveillance of PP2A holoenzymes.


    Organizational Affiliation

    McArdle Laboratory, Department of Oncology, University of Wisconsin-Madison, School of Medicine and Public Health, Madison, Wisconsin 53706, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Immunoglobulin-binding protein 1
A
222Homo sapiensMutation(s): 0 
Gene Names: IGBP1 (IBP1)
Find proteins for P78318 (Homo sapiens)
Go to Gene View: IGBP1
Go to UniProtKB:  P78318
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein phosphatase 2A catalytic subunit alpha isoform
C
151Homo sapiensMutation(s): 0 
Gene Names: PPP2CA
EC: 3.1.3.16
Find proteins for P67775 (Homo sapiens)
Go to Gene View: PPP2CA
Go to UniProtKB:  P67775
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, C
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.797 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.179 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 116.127α = 90.00
b = 116.127β = 90.00
c = 81.230γ = 120.00
Software Package:
Software NamePurpose
CRANKphasing
ADSCdata collection
HKL-2000data scaling
PHENIXrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-04-17
    Type: Initial release
  • Version 1.1: 2013-05-29
    Type: Database references
  • Version 1.2: 2017-11-15
    Type: Refinement description