2PKG

Structure of a complex between the A subunit of protein phosphatase 2A and the small t antigen of SV40


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.312 
  • R-Value Work: 0.247 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural and biochemical insights into the regulation of protein phosphatase 2A by small t antigen of SV40.

Chen, Y.Xu, Y.Bao, Q.Xing, Y.Li, Z.Lin, Z.Stock, J.B.Jeffrey, P.D.Shi, Y.

(2007) Nat.Struct.Mol.Biol. 14: 527-534

  • DOI: 10.1038/nsmb1254

  • PubMed Abstract: 
  • The small t antigen (ST) of DNA tumor virus SV40 facilitates cellular transformation by disrupting the functions of protein phosphatase 2A (PP2A) through a poorly defined mechanism. The crystal structure of the core domain of SV40 ST bound to the sca ...

    The small t antigen (ST) of DNA tumor virus SV40 facilitates cellular transformation by disrupting the functions of protein phosphatase 2A (PP2A) through a poorly defined mechanism. The crystal structure of the core domain of SV40 ST bound to the scaffolding subunit of human PP2A reveals that the ST core domain has a novel zinc-binding fold and interacts with the conserved ridge of HEAT repeats 3-6, which overlaps with the binding site for the B' (also called PR61 or B56) regulatory subunit. ST has a lower binding affinity than B' for the PP2A core enzyme. Consequently, ST does not efficiently displace B' from PP2A holoenzymes in vitro. Notably, ST inhibits PP2A phosphatase activity through its N-terminal J domain. These findings suggest that ST may function mainly by inhibiting the phosphatase activity of the PP2A core enzyme, and to a lesser extent by modulating assembly of the PP2A holoenzymes.


    Organizational Affiliation

    Department of Molecular Biology, Lewis Thomas Laboratory, Princeton University, Princeton, New Jersey 08544, USA.




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
580Homo sapiensGene Names: PPP2R1A
Find proteins for P30153 (Homo sapiens)
Go to Gene View: PPP2R1A
Go to UniProtKB:  P30153
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Small T antigen
C, D
88Simian virus 40N/A
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 
C, D
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.312 
  • R-Value Work: 0.247 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 137.700α = 90.00
b = 147.790β = 90.00
c = 209.650γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
ADSCdata collection
PHASERphasing
SCALEPACKdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2007-04-17 
  • Released Date: 2007-05-15 
  • Deposition Author(s): Jeffrey, P.D., Shi, Y.

Revision History 

  • Version 1.0: 2007-05-15
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance