Prominent members of the human gut microbiota express endo-acting O-glycanases to initiate mucin breakdown

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.197 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Prominent members of the human gut microbiota express endo-acting O-glycanases to initiate mucin breakdown.

Crouch, L.I.Liberato, M.V.Urbanowicz, P.A.Basle, A.Lamb, C.A.Stewart, C.J.Cooke, K.Doona, M.Needham, S.Brady, R.R.Berrington, J.E.Madunic, K.Wuhrer, M.Chater, P.Pearson, J.P.Glowacki, R.Martens, E.C.Zhang, F.Linhardt, R.J.Spencer, D.I.R.Bolam, D.N.

(2020) Nat Commun 11: 4017-4017

  • DOI: https://doi.org/10.1038/s41467-020-17847-5
  • Primary Citation of Related Structures:  
    6T2N, 6T2O, 6T2P, 6T2Q, 6T2R, 6T2S

  • PubMed Abstract: 

    The thick mucus layer of the gut provides a barrier to infiltration of the underlying epithelia by both the normal microbiota and enteric pathogens. Some members of the microbiota utilise mucin glycoproteins as a nutrient source, but a detailed understanding of the mechanisms used to breakdown these complex macromolecules is lacking. Here we describe the discovery and characterisation of endo-acting enzymes from prominent mucin-degrading bacteria that target the polyLacNAc structures within oligosaccharide side chains of both animal and human mucins. These O-glycanases are part of the large and diverse glycoside hydrolase 16 (GH16) family and are often lipoproteins, indicating that they are surface located and thus likely involved in the initial step in mucin breakdown. These data provide a significant advance in our knowledge of the mechanism of mucin breakdown by the normal microbiota. Furthermore, we also demonstrate the potential use of these enzymes as tools to explore changes in O-glycan structure in a number of intestinal disease states.

  • Organizational Affiliation

    Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, UK. l.i.crouch@bham.ac.uk.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-glycosidaseA [auth AAA]264Bacteroides caccaeMutation(s): 0 
Gene Names: bglA_5DW190_07485DW794_15185DWY26_17235DWZ35_07795DXA49_02580EAJ00_16275ERS852494_03890
Find proteins for A0A174TK78 (Bacteroides caccae)
Explore A0A174TK78 
Go to UniProtKB:  A0A174TK78
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A174TK78
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.197 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 46.928α = 90
b = 87.135β = 90
c = 156.193γ = 90
Software Package:
Software NamePurpose
xia2data reduction
DIALSdata reduction
BUCCANEERmodel building
Cootmodel building

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/M029018/1

Revision History  (Full details and data files)

  • Version 1.0: 2020-07-08
    Type: Initial release
  • Version 1.1: 2020-08-26
    Changes: Database references
  • Version 1.2: 2024-01-24
    Changes: Data collection, Database references, Derived calculations, Refinement description