2IAE

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.257 
  • R-Value Observed: 0.260 

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This is version 1.5 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
  • Primary Citation of Related Structures:  
    2IAE

  • 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 functionally regulated remains unclear ...

    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
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Serine/threonine-protein phosphatase 2A 65 kDa regulatory subunit A alpha isoformA, D589Mus musculusMutation(s): 0 
Gene Names: Ppp2r1a
EC: 3.1.3.16
UniProt
Find proteins for Q76MZ3 (Mus musculus)
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Go to UniProtKB:  Q76MZ3
Entity Groups  
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UniProt GroupQ76MZ3
Protein Feature View
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Serine/threonine-protein phosphatase 2A 56 kDa regulatory subunit gamma isoformB, E407Homo sapiensMutation(s): 0 
Gene Names: PPP2R5CKIAA0044
EC: 3.1.3.16
UniProt & NIH Common Fund Data Resources
Find proteins for Q13362 (Homo sapiens)
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Go to UniProtKB:  Q13362
PHAROS:  Q13362
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UniProt GroupQ13362
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Serine/threonine-protein phosphatase 2A catalytic subunit alpha isoformC, F309Homo sapiensMutation(s): 1 
Gene Names: PPP2CA
EC: 3.1.3.16
UniProt & NIH Common Fund Data Resources
Find proteins for P67775 (Homo sapiens)
Explore P67775 
Go to UniProtKB:  P67775
PHAROS:  P67775
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UniProt GroupP67775
Protein Feature View
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  • Reference Sequence

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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
microcystin-LRG [auth M],
H [auth N]
7Microcystis aeruginosaMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MLL
Query on MLL
C, F L-PEPTIDE LINKINGC7 H15 N O2LEU
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 4
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000212
Query on PRD_000212
G [auth M], H [auth N]Microcystin LROligopeptide / Toxin Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.257 
  • R-Value Observed: 0.260 
  • Space Group: P 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 265.301α = 90
b = 265.301β = 90
c = 265.301γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SHARPphasing
DMphasing
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

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

Revision History  (Full details and data files)

  • Version 1.0: 2006-12-26
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Database references, Derived calculations, Non-polymer description, Version format compliance
  • Version 1.3: 2012-12-12
    Changes: Other
  • Version 1.4: 2017-10-18
    Changes: Advisory, Refinement description
  • Version 1.5: 2021-10-20
    Changes: Database references, Derived calculations