9O6A | pdb_00009o6a

CryoEM structure of EcKatG S-Trp105 at 2.22 Angstrom resolution revealing an asymmetric sulfur center in O=S-Trp

• PDB DOI: https://doi.org/10.2210/pdb9O6A/pdb
• EM Map EMD-70168: EMDB EMDataResource

• Classification: OXIDOREDUCTASE
• Organism(s): Escherichia coli K-12
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2025-04-11 Released: 2026-04-22 
• Deposition Author(s): Duan, R., Li, J., Nathan, B., Yang, X., Liu, A.
• 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: 2.22 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental

Literature

2.22 Angstrom resolution cryoEM structure of EcKatG S-Trp105 with asymmetric S-oxygenation

Duan, R., Li, J., Liu, A.

To be published.

Biological Assembly 1  

Global Symmetry: Dihedral - D2  (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: 326.89 kDa 
• Atom Count: 20,360 
• Modeled Residue Count: 2,576 
• Deposited Residue Count: 2,932 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Catalase-peroxidase	A, B, C, D	733	Escherichia coli K-12	Mutation(s): 0  Gene Names: katG, ECDH10B_4131 EC: 1.11.1.21
UniProt
Find proteins for B1XBA8 (Escherichia coli (strain K12 / DH10B)) Explore B1XBA8  Go to UniProtKB:  B1XBA8

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEM	E [auth A], F [auth B], G [auth C], H [auth D]	PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
A1B9V	A, B, C, D	L-PEPTIDE LINKING	C11 H13 N O3 S		TRP

Experimental Data & Validation

Experimental Data

• Method: ELECTRON MICROSCOPY
• Resolution: 2.22 Å
• Aggregation State: PARTICLE 
• Reconstruction Method: SINGLE PARTICLE 

EM Software:

Task	Software Package	Version
MODEL REFINEMENT	PHENIX	2.0rc1_5599
RECONSTRUCTION	cryoSPARC	4.5.3

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-04-22 
Deposition Author(s): Duan, R., Li, J., Nathan, B., Yang, X., Liu, A.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R01 GM152982

Revision History  

• Version 1.0: 2026-04-22
  Type: Initial release