4I5J

PP2A PR70 Holoenzyme


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.09 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.197 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of the Ca(2+)-dependent PP2A heterotrimer and insights into Cdc6 dephosphorylation.

Wlodarchak, N.Guo, F.Satyshur, K.A.Jiang, L.Jeffrey, P.D.Sun, T.Stanevich, V.Mumby, M.C.Xing, Y.

(2013) Cell Res 23: 931-946

  • DOI: 10.1038/cr.2013.77
  • Primary Citation of Related Structures:  
    4I5J, 4I5K, 4I5L, 4I5N

  • PubMed Abstract: 
  • The B″/PR72 family of protein phosphatase 2A (PP2A) is an important PP2A family involved in diverse cellular processes, and uniquely regulated by calcium binding to the regulatory subunit. The PR70 subunit in this family interacts with cell division ...

    The B″/PR72 family of protein phosphatase 2A (PP2A) is an important PP2A family involved in diverse cellular processes, and uniquely regulated by calcium binding to the regulatory subunit. The PR70 subunit in this family interacts with cell division control 6 (Cdc6), a cell cycle regulator important for control of DNA replication. Here, we report crystal structures of the isolated PR72 and the trimeric PR70 holoenzyme at a resolution of 2.1 and 2.4 Å, respectively, and in vitro characterization of Cdc6 dephosphorylation. The holoenzyme structure reveals that one of the PR70 calcium-binding motifs directly contacts the scaffold subunit, resulting in the most compact scaffold subunit conformation among all PP2A holoenzymes. PR70 also binds distinctively to the catalytic subunit near the active site, which is required for PR70 to enhance phosphatase activity toward Cdc6. Our studies provide a structural basis for unique regulation of B″/PR72 holoenzymes by calcium ions, and suggest the mechanisms for precise control of substrate specificity among PP2A holoenzymes.


    Organizational Affiliation

    McArdle Laboratory, Department of Oncology, University of Wisconsin-Madison, School of Medicine and Public Health, Madison, WI, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Serine/threonine-protein phosphatase 2A regulatory subunit B'' subunit alphaA285Homo sapiensMutation(s): 0 
Gene Names: PPP2R3APPP2R3
Find proteins for Q06190 (Homo sapiens)
Explore Q06190 
Go to UniProtKB:  Q06190
NIH Common Fund Data Resources
PHAROS  Q06190
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.09 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.197 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.61α = 90
b = 67.61β = 90
c = 139.11γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
CNSrefinement
CBASSdata collection
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-05-08
    Type: Initial release
  • Version 1.1: 2013-07-24
    Changes: Database references
  • Version 1.2: 2019-07-17
    Changes: Data collection, Refinement description