2IAE

Crystal structure of a protein phosphatase 2A (PP2A) holoenzyme.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.257 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Crystal structure of a protein phosphatase 2A heterotrimeric holoenzyme.

Cho, U.S.Xu, W.

(2007) Nature 445: 53-57

  • DOI: 10.1038/nature05351

  • PubMed Abstract: 
  • Protein phosphatase 2A (PP2A) is a principal Ser/Thr phosphatase, the deregulation of which is associated with multiple human cancers, Alzheimer's disease and increased susceptibility to pathogen infections. How PP2A is structurally organized and fun ...

    Protein phosphatase 2A (PP2A) is a principal Ser/Thr phosphatase, the deregulation of which is associated with multiple human cancers, Alzheimer's disease and increased susceptibility to pathogen infections. How PP2A is structurally organized and functionally regulated remains unclear. Here we report the crystal structure of an AB'C heterotrimeric PP2A holoenzyme. The structure reveals that the HEAT repeats of the scaffold A subunit form a horseshoe-shaped fold, holding the catalytic C and regulatory B' subunits together on the same side. The regulatory B' subunit forms pseudo-HEAT repeats and interacts with the C subunit near the active site, thereby defining substrate specificity. The methylated carboxy-terminal tail of the C subunit interacts with a highly negatively charged region at the interface between A and B' subunits, suggesting that the C-terminal carboxyl methylation of the C subunit promotes B' subunit recruitment by neutralizing charge repulsion. Together, our structural results establish a crucial foundation for understanding PP2A assembly, substrate recruitment and regulation.


    Organizational Affiliation

    Department of Biological Structure, University of Washington, Seattle, Washington 98195, 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, D
589Mus musculusMutation(s): 0 
Gene Names: Ppp2r1a
Find proteins for Q76MZ3 (Mus musculus)
Go to UniProtKB:  Q76MZ3
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein phosphatase 2A 56 kDa regulatory subunit gamma isoform
B, E
407Homo sapiensMutation(s): 0 
Gene Names: PPP2R5C (KIAA0044)
Find proteins for Q13362 (Homo sapiens)
Go to Gene View: PPP2R5C
Go to UniProtKB:  Q13362
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein phosphatase 2A catalytic subunit alpha isoform
C, F
309Homo sapiensMutation(s): 1 
Gene Names: PPP2CA
EC: 3.1.3.16
Find proteins for P67775 (Homo sapiens)
Go to Gene View: PPP2CA
Go to UniProtKB:  P67775
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
microcystin-LR
M, N
7N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

Download SDF File 
Download CCD File 
C, F
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
Biologically Interesting Molecules 1 Unique
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000212
Query on PRD_000212
M,NMicrocystin LROligopeptide / Toxin

--

Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MLL
Query on MLL
C, F
L-PEPTIDE LINKINGC7 H15 N O2LEU
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.257 
  • Space Group: P 21 3
Unit Cell:
Length (Å)Angle (°)
a = 265.301α = 90.00
b = 265.301β = 90.00
c = 265.301γ = 90.00
Software Package:
Software NamePurpose
DMphasing
HKL-2000data reduction
REFMACrefinement
SCALEPACKdata scaling
SHARPphasing
HKL-2000data scaling
DENZOdata reduction
HKL-2000data collection
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2006-09-07 
  • Released Date: 2006-12-26 
  • Deposition Author(s): Cho, U.S., Xu, W.

Revision History 

  • Version 1.0: 2006-12-26
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Database references, Derived calculations, Non-polymer description, Version format compliance
  • Version 1.3: 2012-12-12
    Type: Other
  • Version 1.4: 2017-10-18
    Type: Advisory, Refinement description