2PF4

Crystal structure of the full-length simian virus 40 small t antigen complexed with the protein phosphatase 2A Aalpha subunit


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.244 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis of PP2A inhibition by small t antigen.

Cho, U.S.Morrone, S.Sablina, A.A.Arroyo, J.D.Hahn, W.C.Xu, W.

(2007) Plos Biol. 5: e202-e202

  • DOI: 10.1371/journal.pbio.0050202

  • PubMed Abstract: 
  • The SV40 small t antigen (ST) is a potent oncoprotein that perturbs the function of protein phosphatase 2A (PP2A). ST directly interacts with the PP2A scaffolding A subunit and alters PP2A activity by displacing regulatory B subunits from the A subun ...

    The SV40 small t antigen (ST) is a potent oncoprotein that perturbs the function of protein phosphatase 2A (PP2A). ST directly interacts with the PP2A scaffolding A subunit and alters PP2A activity by displacing regulatory B subunits from the A subunit. We have determined the crystal structure of full-length ST in complex with PP2A A subunit at 3.1 A resolution. ST consists of an N-terminal J domain and a C-terminal unique domain that contains two zinc-binding motifs. Both the J domain and second zinc-binding motif interact with the intra-HEAT-repeat loops of HEAT repeats 3-7 of the A subunit, which overlaps with the binding site of the PP2A B56 subunit. Intriguingly, the first zinc-binding motif is in a position that may allow it to directly interact with and inhibit the phosphatase activity of the PP2A catalytic C subunit. These observations provide a structural basis for understanding the oncogenic functions of ST.


    Organizational Affiliation

    Department of Biological Structure, University of Washington, Seattle, Washington, United States of America.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein phosphatase 2A 65 kDa regulatory subunit A alpha isoform
A, B, C, D
589Mus musculusMutation(s): 0 
Gene Names: Ppp2r1a
Find proteins for Q76MZ3 (Mus musculus)
Go to UniProtKB:  Q76MZ3
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Small T antigen
E, F, G, H
174Simian virus 40Mutation(s): 0 
Find proteins for P03081 (Simian virus 40)
Go to UniProtKB:  P03081
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
E, F, G, H
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.1 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.244 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 94.711α = 115.64
b = 105.501β = 109.55
c = 111.937γ = 94.11
Software Package:
Software NamePurpose
HKL-2000data reduction
SHARPphasing
DENZOdata reduction
DMphasing
REFMACrefinement
HKL-2000data scaling
SCALEPACKdata scaling
PHASERphasing
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-08-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2013-05-22
    Type: Database references
  • Version 1.3: 2017-10-18
    Type: Refinement description