9MZW | pdb_00009mzw

PP2A-B55 holoenzyme

• PDB DOI: https://doi.org/10.2210/pdb9MZW/pdb
• EM Map EMD-48770: EMDB EMDataResource

• Classification: ONCOPROTEIN
• Organism(s): Homo sapiens
• Expression System: Homo sapiens
• Mutation(s): No 


• Deposited: 2025-01-23 Released: 2025-09-10 
• Deposition Author(s): Shi, S., Li, X., Alderman, C., Huang, W., Taylor, D., Zhao, R.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.16 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

PP2A Holoenzyme with B55 subunit

Shi, S., Li, X., Alderman, C., Huang, W., Zhao, R.

To be published.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 152.89 kDa 
• Atom Count: 10,476 
• Modeled Residue Count: 1,311 
• Deposited Residue Count: 1,346 
• Unique protein chains: 3

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Serine/threonine-protein phosphatase 2A 65 kDa regulatory subunit A alpha isoform	A	584	Homo sapiens	Mutation(s): 0  Gene Names: PPP2R1A
UniProt & NIH Common Fund Data Resources
Find proteins for P30153 (Homo sapiens) Explore P30153  Go to UniProtKB:  P30153
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	451	Homo sapiens	Mutation(s): 0  Gene Names: PPP2R2A
UniProt & NIH Common Fund Data Resources
Find proteins for P63151 (Homo sapiens) Explore P63151  Go to UniProtKB:  P63151
PHAROS:  P63151 GTEx:  ENSG00000221914

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Serine/threonine-protein phosphatase 2A catalytic subunit alpha isoform	C	311	Homo sapiens	Mutation(s): 0  Gene Names: PPP2CA EC: 3.1.3.16
UniProt & NIH Common Fund Data Resources
Find proteins for P67775 (Homo sapiens) Explore P67775  Go to UniProtKB:  P67775
PHAROS:  P67775 GTEx:  ENSG00000113575

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.16 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	1.21_5207

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-09-10 
Deposition Author(s): Shi, S., Li, X., Alderman, C., Huang, W., Taylor, D., Zhao, R.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R35GM145289

Revision History  

• Version 1.0: 2025-09-10
  Type: Initial release