1O9W

F17-aG lectin domain from Escherichia coli in complex with N-acetyl-glucosamine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.211 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The Fimbrial Adhesin F17-G of Enterotoxigenic Escherichia Coli Has an Immunoglobulin-Like Lectin Domain that Binds N-Acetylglucosamine

Buts, L.Bouckaert, J.De Genst, E.Loris, R.Oscarson, S.Lahmann, M.Messens, J.Brosens, E.Wyns, L.De Greve, H.

(2003) Mol.Microbiol. 49: 705

  • Primary Citation of Related Structures:  1O9V, 1O9Z

  • PubMed Abstract: 
  • The F17-G adhesin at the tip of flexible F17 fimbriae of enterotoxigenic Escherichia coli mediates binding to N-acetyl-beta-D-glucosamine-presenting receptors on the microvilli of the intestinal epithelium of ruminants. We report the 1.7 A resolution ...

    The F17-G adhesin at the tip of flexible F17 fimbriae of enterotoxigenic Escherichia coli mediates binding to N-acetyl-beta-D-glucosamine-presenting receptors on the microvilli of the intestinal epithelium of ruminants. We report the 1.7 A resolution crystal structure of the lectin domain of F17-G, both free and in complex with N-acetylglucosamine. The monosaccharide is bound on the side of the ellipsoid-shaped protein in a conserved site around which all natural variations of F17-G are clustered. A model is proposed for the interaction between F17-fimbriated E. coli and microvilli with enhanced affinity compared with the binding constant we determined for F17-G binding to N-acetylglucosamine (0.85 mM-1). Unexpectedly, the F17-G structure reveals that the lectin domains of the F17-G, PapGII and FimH fimbrial adhesins all share the immunoglobulin-like fold of the structural components (pilins) of their fimbriae, despite lack of any sequence identity. Fold comparisons with pilin and chaperone structures of the chaperone/usher pathway highlight the central role of the C-terminal beta-strand G of the immunoglobulin-like fold and provides new insights into pilus assembly, function and adhesion.


    Related Citations: 
    • Identification, Characterization and Nucleotide Sequence of the F17G Gene, which Determines Receptor Binding of Escherichia Coli F17 Fimbriae
      Lintermans, P.F.,Bertels, A.,Schlicker, C.,Deboeck, F.,Charlier, G.,Pohl, P.,Norgren, M.,Normark, S.,Van Montagu, M.,De Greve, H.
      (1991) J.Bacteriol. 173: 3366
    • Solving the Phase Problem for Carbohydrate -Binding Proteins Using Selenium Derivatives of Their Ligands: A Case Study Involving the Bacterial F17-G Adhesin
      Buts, L.,Loris, R.,De Genst, E.,Oscarson, S.,Lahmann, M.,Messens, J.,Brosens, E.,Wyns, L.,De Greve, H.,Bouckaert, J.
      (2003) Acta Crystallogr.,Sect.D 59: 1012


    Organizational Affiliation

    Department of Ultrastructure, Institute for Molecular Biology, Vrije Universiteit Brussel, Vlaams Interuniversitair Instituut voor Biotechnologie, Brussels, Belgium.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
F17A-G FIMBRIAL ADHESIN
A
177Escherichia coliGene Names: f17aG
Find proteins for Q99003 (Escherichia coli)
Go to UniProtKB:  Q99003
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NAG
Query on NAG

Download SDF File 
Download CCD File 
A
N-ACETYL-D-GLUCOSAMINE
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
NAGKd: 1180000 nM BINDINGMOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.211 
  • Space Group: P 61 2 2
Unit Cell:
Length (Å)Angle (°)
a = 42.329α = 90.00
b = 42.329β = 90.00
c = 268.714γ = 120.00
Software Package:
Software NamePurpose
CNSphasing
SCALEPACKdata scaling
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-05-29
    Type: Initial release
  • Version 1.1: 2012-01-18
    Type: Database references, Derived calculations, Non-polymer description, Other, Refinement description, Structure summary, Version format compliance