4LAC

Crystal Structure of Protein Phosphatase 2A (PP2A) and PP2A phosphatase activator (PTPA) complex with ATPgammaS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.82 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.188 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis of PP2A activation by PTPA, an ATP-dependent activation chaperone.

Guo, F.Stanevich, V.Wlodarchak, N.Sengupta, R.Jiang, L.Satyshur, K.A.Xing, Y.

(2014) Cell Res. 24: 190-203

  • DOI: 10.1038/cr.2013.138

  • PubMed Abstract: 
  • Proper activation of protein phosphatase 2A (PP2A) catalytic subunit is central for the complex PP2A regulation and is crucial for broad aspects of cellular function. The crystal structure of PP2A bound to PP2A phosphatase activator (PTPA) and ATPγS ...

    Proper activation of protein phosphatase 2A (PP2A) catalytic subunit is central for the complex PP2A regulation and is crucial for broad aspects of cellular function. The crystal structure of PP2A bound to PP2A phosphatase activator (PTPA) and ATPγS reveals that PTPA makes broad contacts with the structural elements surrounding the PP2A active site and the adenine moiety of ATP. PTPA-binding stabilizes the protein fold of apo-PP2A required for activation, and orients ATP phosphoryl groups to bind directly to the PP2A active site. This allows ATP to modulate the metal-binding preferences of the PP2A active site and utilize the PP2A active site for ATP hydrolysis. In vitro, ATP selectively and drastically enhances binding of endogenous catalytic metal ions, which requires ATP hydrolysis and is crucial for acquisition of pSer/Thr-specific phosphatase activity. Furthermore, both PP2A- and ATP-binding are required for PTPA function in cell proliferation and survival. Our results suggest novel mechanisms of PTPA in PP2A activation with structural economy and a unique ATP-binding pocket that could potentially serve as a specific therapeutic target.


    Organizational Affiliation

    McArdle Laboratory, Department of Oncology, University of Wisconsin at Madison, School of Medicine and Public Health, Madison, WI 53706, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein phosphatase 2A activator
B
308Homo sapiensMutation(s): 0 
Gene Names: PTPA (PPP2R4)
EC: 5.2.1.8
Find proteins for Q15257 (Homo sapiens)
Go to Gene View: PTPA
Go to UniProtKB:  Q15257
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PP2A Scaffold Subunit A, Truncated, an internal deletion of PP2A A
A
258Homo sapiensMutation(s): 0 
Gene Names: PPP2R1A
Find proteins for P30153 (Homo sapiens)
Go to Gene View: PPP2R1A
Go to UniProtKB:  P30153
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein phosphatase 2A catalytic subunit alpha isoform
C
311Homo sapiensMutation(s): 0 
Gene Names: PPP2CA
EC: 3.1.3.16
Find proteins for P67775 (Homo sapiens)
Go to Gene View: PPP2CA
Go to UniProtKB:  P67775
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

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Download CCD File 
C
MANGANESE (II) ION
Mn
WAEMQWOKJMHJLA-UHFFFAOYSA-N
 Ligand Interaction
PEG
Query on PEG

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Download CCD File 
A
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
AGS
Query on AGS

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Download CCD File 
C
PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER
ATP-GAMMA-S; ADENOSINE 5'-(3-THIOTRIPHOSPHATE); ADENOSINE 5'-(GAMMA-THIOTRIPHOSPHATE); ADENOSINE-5'-DIPHOSPHATE MONOTHIOPHOSPHATE
C10 H16 N5 O12 P3 S
NLTUCYMLOPLUHL-KQYNXXCUSA-N
 Ligand Interaction
MES
Query on MES

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C
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.82 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.188 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 57.070α = 90.00
b = 100.186β = 90.00
c = 167.450γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
REFMACrefinement
ADSCdata collection
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-10-09
    Type: Initial release
  • Version 1.1: 2013-10-30
    Type: Database references
  • Version 1.2: 2014-02-19
    Type: Database references