6C0B

Structural basis for recognition of frizzled proteins by Clostridium difficile toxin B


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.5 of the entry. See complete history


Literature

Structural basis for recognition of frizzled proteins byClostridium difficiletoxin B.

Chen, P.Tao, L.Wang, T.Zhang, J.He, A.Lam, K.H.Liu, Z.He, X.Perry, K.Dong, M.Jin, R.

(2018) Science 360: 664-669

  • DOI: https://doi.org/10.1126/science.aar1999
  • Primary Citation of Related Structures:  
    6C0B

  • PubMed Abstract: 

    Clostridium difficile infection is the most common cause of antibiotic-associated diarrhea in developed countries. The major virulence factor, C. difficile toxin B (TcdB), targets colonic epithelia by binding to the frizzled (FZD) family of Wnt receptors, but how TcdB recognizes FZDs is unclear. Here, we present the crystal structure of a TcdB fragment in complex with the cysteine-rich domain of human FZD2 at 2.5-angstrom resolution, which reveals an endogenous FZD-bound fatty acid acting as a co-receptor for TcdB binding. This lipid occupies the binding site for Wnt-adducted palmitoleic acid in FZDs. TcdB binding locks the lipid in place, preventing Wnt from engaging FZDs and signaling. Our findings establish a central role of fatty acids in FZD-mediated TcdB pathogenesis and suggest strategies to modulate Wnt signaling.


  • Organizational Affiliation

    Department of Physiology and Biophysics, University of California, Irvine, Irvine, CA, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Toxin B522Clostridioides difficileMutation(s): 0 
Gene Names: tcdB
EC: 3.4.22
UniProt
Find proteins for P18177 (Clostridioides difficile)
Explore P18177 
Go to UniProtKB:  P18177
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP18177
Sequence Annotations
Expand
  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Frizzled-2156Homo sapiensMutation(s): 0 
Gene Names: FZD2
UniProt & NIH Common Fund Data Resources
Find proteins for Q14332 (Homo sapiens)
Explore Q14332 
Go to UniProtKB:  Q14332
PHAROS:  Q14332
GTEx:  ENSG00000180340 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ14332
Glycosylation
Glycosylation Sites: 1Go to GlyGen: Q14332-1
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.199 
  • R-Value Observed: 0.201 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.611α = 90
b = 175.613β = 90
c = 174.423γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR01AI091823, R01 AI125704, and R21AI123920

Revision History  (Full details and data files)

  • Version 1.0: 2018-05-16
    Type: Initial release
  • Version 1.1: 2018-05-23
    Changes: Data collection, Database references
  • Version 1.2: 2019-02-20
    Changes: Author supporting evidence, Data collection
  • Version 1.3: 2019-12-18
    Changes: Author supporting evidence
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Structure summary
  • Version 1.5: 2024-11-06
    Changes: Data collection, Database references, Structure summary