Biological Assembly 1  

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

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

Macromolecule Content

• Total Structure Weight: 279.05 kDa 
• Atom Count: 20,821 
• Modelled Residue Count: 2,367 
• Deposited Residue Count: 2,432 
• Unique protein chains: 1

 7KGY

Beta-glucuronidase from Faecalibacterium prausnitzii bound to the inhibitor UNC10201652-glucuronide

• PDB DOI:  https://doi.org/10.2210/pdb7KGY/pdb

• Classification: HYDROLASE/INHIBITOR
• Organism(s): Faecalibacterium prausnitzii
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2020-10-19 Released: 2021-11-10 
• Deposition Author(s): Simpson, J.B., Redinbo, M.R.
• Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.193 
• R-Value Work: 0.147 
• R-Value Observed: 0.147 

Literature

Microbial enzymes induce colitis by reactivating triclosan in the mouse gastrointestinal tract.

Zhang, J., Walker, M.E., Sanidad, K.Z., Zhang, H., Liang, Y., Zhao, E., Chacon-Vargas, K., Yeliseyev, V., Parsonnet, J., Haggerty, T.D., Wang, G., Simpson, J.B., Jariwala, P.B., Beaty, V.V., Yang, J., Yang, H., Panigrahy, A., Minter, L.M., Kim, D., Gibbons, J.G., Liu, L., Li, Z., Xiao, H., Borlandelli, V., Overkleeft, H.S., Cloer, E.W., Major, M.B., Goldfarb, D., Cai, Z., Redinbo, M.R., Zhang, G.

(2022) Nat Commun 13: 136-136

• PubMed: 35013263 
• DOI: https://doi.org/10.1038/s41467-021-27762-y
• Primary Citation of Related Structures:  
  7KGY, 7KGZ


• PubMed Abstract: 
  

Emerging research supports that triclosan (TCS), an antimicrobial agent found in thousands of consumer products, exacerbates colitis and colitis-associated colorectal tumorigenesis in animal models. While the intestinal toxicities of TCS require the presence of gut microbiota, the molecular mechanisms involved have not been defined. Here we show that intestinal commensal microbes mediate metabolic activation of TCS in the colon and drive its gut toxicology. Using a range of in vitro, ex vivo, and in vivo approaches, we identify specific microbial β-glucuronidase (GUS) enzymes involved and pinpoint molecular motifs required to metabolically activate TCS in the gut. Finally, we show that targeted inhibition of bacterial GUS enzymes abolishes the colitis-promoting effects of TCS, supporting an essential role of specific microbial proteins in TCS toxicity. Together, our results define a mechanism by which intestinal microbes contribute to the metabolic activation and gut toxicity of TCS, and highlight the importance of considering the contributions of the gut microbiota in evaluating the toxic potential of environmental chemicals.

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Organizational Affiliation: 

Department of Food Science and Technology, National University of Singapore, Singapore, Singapore. [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Beta-glucuronidase	A, B, C, D	608	Faecalibacterium prausnitzii	Mutation(s): 0  Gene Names: uidA, ERS852426_02720 EC: 3.2.1.31 (PDB Primary Data), 3.2.1.23 (UniProt)
UniProt
Find proteins for A0A174DZW7 (Faecalibacterium prausnitzii) Explore A0A174DZW7  Go to UniProtKB:  A0A174DZW7

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
I9G (Subject of Investigation/LOI)	E [auth A], G [auth B], I [auth C], J [auth D]	8-(4-beta-D-glucopyranuronosylpiperazin-1-yl)-5-(morpholin-4-yl)-1,2,3,4-tetrahydro[1,2,3]triazino[4',5':4,5]thieno[2,3 -c]isoquinoline C26 H33 N7 O7 S AQRGEQSNANJABA-WFFUTXBBSA-N
GOL	F [auth A], H [auth B], K [auth D]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.193 
• R-Value Work: 0.147 
• R-Value Observed: 0.147 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 114.52	α = 90
b = 128.405	β = 90
c = 177.264	γ = 90

Software Package:

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

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2021-11-10 
Deposition Author(s): Simpson, J.B., Redinbo, M.R.

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	GM137286

Revision History  

• Version 1.0: 2021-11-10
  Type: Initial release
  
• Version 1.1: 2022-01-26
  Changes: Database references