2G62

Crystal structure of human PTPA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.152 
  • R-Value Observed: 0.154 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

The crystal structure of a human PP2A phosphatase activator reveals a novel fold and highly conserved cleft implicated in protein-protein interactions.

Magnusdottir, A.Stenmark, P.Flodin, S.Nyman, T.Hammarstrom, M.Ehn, M.Bakali H, M.A.Berglund, H.Nordlund, P.

(2006) J Biol Chem 281: 22434-22438

  • DOI: 10.1074/jbc.C600100200
  • Primary Citation of Related Structures:  
    2G62

  • PubMed Abstract: 
  • Protein phosphatase 2A (PP2A) is a heterotrimeric Ser/Thr phosphatase that is involved in regulating a plethora of signaling pathways in the cell, making its regulation a critical part of the well being of the cell. For example, three of the non-catalytic PP2A subunits have been linked to carcinogenic events ...

    Protein phosphatase 2A (PP2A) is a heterotrimeric Ser/Thr phosphatase that is involved in regulating a plethora of signaling pathways in the cell, making its regulation a critical part of the well being of the cell. For example, three of the non-catalytic PP2A subunits have been linked to carcinogenic events. Therefore, the molecular basis for the complicated protein-protein interaction pattern of PP2A and its regulators is of special interest. The PP2A phosphatase activator (PTPA) protein is highly conserved from humans to yeast. It is an activator of PP2A and has been shown to be essential for a fully functional PP2A, but its mechanism of activation is still not well defined. We have solved the crystal structure of human PTPA to 1.6A. It reveals a two-domain protein with a novel fold comprised of 13 alpha-helices. We have identified a highly conserved cleft as a potential region for interaction with peptide segments of other proteins. Binding studies with ATP and its analogs are not consistent with ATP being a cofactor/substrate for PTPA as had previously been proposed. The structure of PTPA can serve as a basis for structure-function studies directed at elucidating its mechanism as an activator of PP2A.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, Stockholm University 10691 Stockholm, Sweden.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
protein phosphatase 2A, regulatory subunit B' (PR 53) A325Homo sapiensMutation(s): 0 
Gene Names: PPP2R4PTPA
EC: 5.2.1.8
Find proteins for Q15257 (Homo sapiens)
Explore Q15257 
Go to UniProtKB:  Q15257
NIH Common Fund Data Resources
PHAROS:  Q15257
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.183 
  • R-Value Work: 0.152 
  • R-Value Observed: 0.154 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.19α = 90
b = 76.42β = 90
c = 87.3γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
SOLVEphasing

Structure Validation

View Full Validation Report



Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2006-04-04
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2018-06-20
    Changes: Data collection, Structure summary