2IE4

Structure of the Protein Phosphatase 2A Core Enzyme Bound to okadaic acid


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.270 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of Protein Phosphatase 2A Core Enzyme Bound to Tumor-Inducing Toxins

Xing, Y.Xu, Y.Chen, Y.Jeffrey, P.D.Chao, Y.Lin, Z.Li, Z.Strack, S.Stock, J.B.Shi, Y.

(2006) Cell 127: 341-353

  • DOI: 10.1016/j.cell.2006.09.025
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The serine/threonine phosphatase protein phosphatase 2A (PP2A) plays an essential role in many aspects of cellular functions and has been shown to be an important tumor suppressor. The core enzyme of PP2A comprises a 65 kDa scaffolding subunit and a ...

    The serine/threonine phosphatase protein phosphatase 2A (PP2A) plays an essential role in many aspects of cellular functions and has been shown to be an important tumor suppressor. The core enzyme of PP2A comprises a 65 kDa scaffolding subunit and a 36 kDa catalytic subunit. Here we report the crystal structures of the PP2A core enzyme bound to two of its inhibitors, the tumor-inducing agents okadaic acid and microcystin-LR, at 2.6 and 2.8 A resolution, respectively. The catalytic subunit recognizes one end of the elongated scaffolding subunit by interacting with the conserved ridges of HEAT repeats 11-15. Formation of the core enzyme forces the scaffolding subunit to undergo pronounced structural rearrangement. The scaffolding subunit exhibits considerable conformational flexibility, which is proposed to play an essential role in PP2A function. These structures, together with biochemical analyses, reveal significant insights into PP2A function and serve as a framework for deciphering the diverse roles of PP2A in cellular physiology.


    Organizational Affiliation

    Department of Molecular Biology, Lewis Thomas Laboratory, Princeton University, NJ 08544, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein Phosphatase 2, regulatory subunit A (PR 65), alpha isoform
A
589Homo sapiensMutation(s): 0 
Gene Names: PPP2R1A
Find proteins for P30153 (Homo sapiens)
Go to Gene View: PPP2R1A
Go to UniProtKB:  P30153
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein phosphatase 2A catalytic subunit alpha isoform
C
309Homo 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 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MN
Query on MN

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

Download SDF File 
Download CCD File 
C
OKADAIC ACID
9,10-DEEPITHIO-9,10-DIDEHYDROACANTHIFOLICIN
C44 H68 O13
QNDVLZJODHBUFM-WFXQOWMNSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
OKAIC50: 0.1 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.270 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 92.540α = 90.00
b = 194.850β = 90.00
c = 201.350γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data collection
CNSrefinement
HKL-2000data reduction
AMoREphasing
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-11-07
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance