9MRG | pdb_00009mrg

Cryo-EM structure of KwaA tetramer with C2 symmetry

• PDB DOI: https://doi.org/10.2210/pdb9MRG/pdb
• EM Map EMD-48556: EMDB EMDataResource

• Classification: IMMUNE SYSTEM
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2025-01-07 Released: 2025-11-05 
• Deposition Author(s): Zhang, Z., Patel, D.J.
• Funding Organization(s): National Institutes of Health/National Cancer Institute (NIH/NCI)

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Experimental Data Snapshot

• Method: ELECTRON MICROSCOPY
• Resolution: 3.69 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Literature

Cryo-EM structure of KwaA tetramer with C2 symmetry

Zhang, Z., Patel, D.J.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C4  (Explore in 3D)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: electron microscopy

Macromolecule Content 

• Total Structure Weight: 91.11 kDa 
• Atom Count: 5,953 
• Modeled Residue Count: 721 
• Deposited Residue Count: 780 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Kiwa protein KwaA	A, B, C, D	195	Escherichia coli	Mutation(s): 0  Gene Names: kwaA, ECO55CA74_24535
UniProt
Find proteins for P0DW45 (Escherichia coli O55:H7 (strain RM12579 / EPEC)) Explore P0DW45  Go to UniProtKB:  P0DW45

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
AV0 (Subject of Investigation/LOI)	E [auth B]	Lauryl Maltose Neopentyl Glycol C47 H88 O22 MADJBYLAYPCCOO-VWHTXWAPSA-N

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 3.69 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-11-05 
Deposition Author(s): Zhang, Z., Patel, D.J.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)	United States	P30 CA008748

Revision History  

• Version 1.0: 2025-11-05
  Type: Initial release