FMN-binding beta-glucuronidase from Roseburia hominis

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.141 
  • R-Value Observed: 0.143 

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Ligand Structure Quality Assessment 

This is version 1.2 of the entry. See complete history


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

  • 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.

  • Organizational Affiliation

    Department of Food Science, University of Massachusetts, Amherst, MA, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
734Roseburia hominisMutation(s): 0 
Find proteins for A0A395V874 (Roseburia hominis)
Explore A0A395V874 
Go to UniProtKB:  A0A395V874
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A395V874
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.141 
  • R-Value Observed: 0.143 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.354α = 90
b = 161.142β = 107.332
c = 86.947γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM137286

Revision History  (Full details and data files)

  • Version 1.0: 2021-11-10
    Type: Initial release
  • Version 1.1: 2022-01-26
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Refinement description