9XVH | pdb_00009xvh

Crystal structure of mature Bacteroides fragilis toxin 1

• PDB DOI: https://doi.org/10.2210/pdb9XVH/pdb

• Classification: TOXIN
• Organism(s): Bacteroides fragilis
• Expression System: Escherichia coli 'BL21-Gold(DE3)pLysS AG
• Mutation(s): No 


• Deposited: 2025-11-26 Released: 2026-01-07 
• Deposition Author(s): Fu, G., Zhao, X., Chai, Y., Wang, L.
• Funding Organization(s): Other government, National Natural Science Foundation of China (NSFC), Chinese Academy of Sciences

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.94 Å
• R-Value Free: 
  0.266 (Depositor), 0.265 (DCC) 
• R-Value Work: 
  0.225 (Depositor), 0.225 (DCC) 
• R-Value Observed: 
  0.227 (Depositor) 

Starting Model: in silico

Literature

Crystal structure of mature Bacteroides fragilis toxin 1

Fu, G., Zhao, X., Chai, Y., Wang, L.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Biological Assembly 3  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 3 assigned by authors.

Biological Assembly 4  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 4 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 83.06 kDa 
• Atom Count: 5,988 
• Modeled Residue Count: 744 
• Deposited Residue Count: 744 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Fragilysin	A, B, C, D	186	Bacteroides fragilis	Mutation(s): 0  Gene Names: btfP EC: 3.4.24.74
UniProt
Find proteins for P54355 (Bacteroides fragilis) Explore P54355  Go to UniProtKB:  P54355

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN (Subject of Investigation/LOI)	E [auth A], F [auth B], G [auth C], H [auth D]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.94 Å
• R-Value Free:  0.266 (Depositor), 0.265 (DCC) 
• R-Value Work:  0.225 (Depositor), 0.225 (DCC) 
• R-Value Observed: 0.227 (Depositor) 

Space Group: P 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 55.318	α = 90.29
b = 63.841	β = 111.89
c = 65.17	γ = 111.72

Software Package:

Software Name	Purpose
PHENIX	refinement
PHENIX	refinement
autoPROC	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2026-01-07 
Deposition Author(s): Fu, G., Zhao, X., Chai, Y., Wang, L.

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Funding Organization	Location	Grant Number
Other government	China	2020YFA0509202, 2025YFC2311800
National Natural Science Foundation of China (NSFC)	China	82222040
Chinese Academy of Sciences	China	YSBR-083

Revision History  

• Version 1.0: 2026-01-07
  Type: Initial release