Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 3-mer - A1B1C1 

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 306.54 kDa 
• Atom Count: 20717 
• Modelled Residue Count: 2596 
• Deposited Residue Count: 2690 
• Unique protein chains: 4

3DW8

Structure of a Protein Phosphatase 2A Holoenzyme with B55 subunit

• DOI: 10.2210/pdb3DW8/pdb

• Classification: HYDROLASE/HYDROLASE INHIBITOR
• Organism(s): Homo sapiens, Cyanobacteria
• Expression System: Escherichia coli, Spodoptera frugiperda
• Mutation(s): Yes 


• Deposited: 2008-07-21 Released: 2008-10-07 
• Deposition Author(s): Xu, Y., Chen, Y., Zhang, P., Jeffrey, P.D., Shi, Y.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.85 Å
• R-Value Free: 0.285 
• R-Value Work: 0.228 
• R-Value Observed: 0.231 

Literature

Structure of a protein phosphatase 2A holoenzyme: insights into B55-mediated Tau dephosphorylation.

Xu, Y., Chen, Y., Zhang, P., Jeffrey, P.D., Shi, Y.

(2008) Mol Cell 31: 873-885

• PubMed: 18922469 
• DOI: 10.1016/j.molcel.2008.08.006
• Primary Citation of Related Structures:  
  3DW8


• PubMed Abstract: 
  

Protein phosphatase 2A (PP2A) regulates many essential aspects of cellular physiology. Members of the regulatory B/B55/PR55 family are thought to play a key role in the dephosphorylation of Tau, whose hyperphosphorylation contributes to Alzheimer's disease. The underlying mechanisms of the PP2A-Tau connection remain largely enigmatic. Here, we report the complete reconstitution of a Tau dephosphorylation assay and the crystal structure of a heterotrimeric PP2A holoenzyme involving the regulatory subunit Balpha. We show that Balpha specifically and markedly facilitates dephosphorylation of the phosphorylated Tau in our reconstituted assay. The Balpha subunit comprises a seven-bladed beta propeller, with an acidic, substrate-binding groove located in the center of the propeller. The beta propeller latches onto the ridge of the PP2A scaffold subunit with the help of a protruding beta hairpin arm. Structure-guided mutagenesis studies revealed the underpinnings of PP2A-mediated dephosphorylation of Tau.

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Organizational Affiliation: 

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

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Serine/threonine-protein phosphatase 2A 65 kDa regulatory subunit A alpha isoform	A, D	582	Homo sapiens	Mutation(s): 0  Gene Names: PPP2R1A
Find proteins for P30153 (Homo sapiens) Explore P30153  Go to UniProtKB:  P30153
NIH Common Fund Data Resources
PHAROS:  P30153 GTEx:  ENSG00000105568

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Serine/threonine-protein phosphatase 2A 55 kDa regulatory subunit B alpha isoform	B, E	447	Homo sapiens	Mutation(s): 1  Gene Names: PPP2R2A
Find proteins for P63151 (Homo sapiens) Explore P63151  Go to UniProtKB:  P63151
NIH Common Fund Data Resources
PHAROS:  P63151 GTEx:  ENSG00000221914

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Serine/threonine-protein phosphatase 2A catalytic subunit alpha isoform	C, F	309	Homo sapiens	Mutation(s): 0  Gene Names: PPP2CA EC: 3.1.3.16
Find proteins for P67775 (Homo sapiens) Explore P67775  Go to UniProtKB:  P67775
NIH Common Fund Data Resources
PHAROS:  P67775 GTEx:  ENSG00000113575

Entity ID: 4
Molecule	Chains	Sequence Length	Organism	Details	Image
microcystin LR	G, H	7	Cyanobacteria	Mutation(s): 0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
MN	C, F	MANGANESE (II) ION Mn WAEMQWOKJMHJLA-UHFFFAOYSA-N

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 4
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_000212	G, H	Microcystin LR	Oligopeptide /  Toxin		--

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.85 Å
• R-Value Free: 0.285 
• R-Value Work: 0.228 
• R-Value Observed: 0.231 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 247.34	α = 90
b = 121.39	β = 132.6
c = 172.48	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
CBASS	data collection
DENZO	data reduction
SCALEPACK	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-07-21 
• Released Date: 2008-10-07 
Deposition Author(s): Xu, Y., Chen, Y., Zhang, P., Jeffrey, P.D., Shi, Y.

Revision History  

• Version 1.0: 2008-10-07
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2011-07-27
  Changes: Database references, Derived calculations, Non-polymer description
• Version 1.3: 2013-02-27
  Changes: Other
• Version 1.4: 2013-09-25
  Changes: Derived calculations
• Version 1.5: 2013-10-16
  Changes: Derived calculations