4I5K

PP2A PR70 Holoenzyme model3_diCa_rcsb.pdb bppnat5_extend.mtz


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.207 

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:  

  • 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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein phosphatase 2A regulatory subunit B'' subunit alpha
A, B
285Homo sapiensMutation(s): 0 
Gene Names: PPP2R3A (PPP2R3)
Find proteins for Q06190 (Homo sapiens)
Go to Gene View: PPP2R3A
Go to UniProtKB:  Q06190
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.207 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 132.812α = 90.00
b = 109.086β = 109.05
c = 67.651γ = 90.00
Software Package:
Software NamePurpose
CNSphasing
PHENIXrefinement
SCALEPACKdata scaling
CNSrefinement
CBASSdata collection
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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