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: 3.10 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.247 

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
  • Primary Citation of Related Structures:  
    2PF4

  • 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 subunit. We have determined the crystal structure of full-length ST in complex with PP2A A subunit at 3 ...

    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: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Serine/threonine-protein phosphatase 2A 65 kDa regulatory subunit A alpha isoform A, B, C, D589Mus musculusMutation(s): 0 
Gene Names: Ppp2r1a
Find proteins for Q76MZ3 (Mus musculus)
Explore Q76MZ3 
Go to UniProtKB:  Q76MZ3
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Small T antigen E, F, G, H174Macaca mulatta polyomavirus 1Mutation(s): 0 
Gene Names: small t antigen
Find proteins for P03081 (Simian virus 40)
Explore P03081 
Go to UniProtKB:  P03081
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.244 
  • R-Value Observed: 0.247 
  • 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
DENZOdata reduction
SCALEPACKdata scaling
PHASERphasing
SHARPphasing
DMphasing
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report


View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

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