2O2L

Crystal structure of human heat-labile enterotoxin in complex with a blood group A antigen analog


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.53 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Blood Group Antigen Recognition by Escherichia coli Heat-labile Enterotoxin

Holmner, A.Askarieh, G.Okvist, M.Krengel, U.

(2007) J.Mol.Biol. 371: 754-764

  • DOI: 10.1016/j.jmb.2007.05.064

  • PubMed Abstract: 
  • In a number of bacterial infections, such as Helicobacter pylori, Campylobacter jejuni and Vibrio cholerae infections, a correlation between the severity of disease and blood group phenotype of infected individuals has been observed. In the present i ...

    In a number of bacterial infections, such as Helicobacter pylori, Campylobacter jejuni and Vibrio cholerae infections, a correlation between the severity of disease and blood group phenotype of infected individuals has been observed. In the present investigation, we have studied the molecular basis of this effect for enterotoxigenic Escherichia coli (ETEC) infections. ETEC are non-invasive bacteria, which act through second messenger pathways to cause diarrhea. It has been suggested that the major virulence factor of ETEC from human isolates, i.e. the human heat-labile enterotoxin (hLT), recognizes certain blood group epitopes, although the molecular basis of blood group antigen recognition is unknown. The 2.5 A crystal structure of the receptor-binding B-subunit of hLT in complex with the blood group A antigen analog GalNAcalpha3(Fucalpha2)Galbeta4(Fucalpha3)Glcbeta provides evidence of a previously unknown binding site in the native toxin. The structure reveals the molecular interactions underlying blood group antigen recognition and suggests how this protein can discriminate between different blood group epitopes. These results support the previously debated role of hLT in the blood group dependence of ETEC infections. Similar observations regarding the closely related cholera toxin in V. cholera infections are also discussed.


    Organizational Affiliation

    Department of Chemistry and Bioscience, Chalmers University of Technology, PO box 462, SE-40530 Göteborg, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Heat-labile enterotoxin B chain
D, E, F, G, H, I, J, K, L, M
103Escherichia coliGene Names: eltB (ltpB)
Find proteins for P0CK94 (Escherichia coli)
Go to UniProtKB:  P0CK94
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BGC
Query on BGC

Download SDF File 
Download CCD File 
N, O, P, Q, R, S, T, U, V, W
BETA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-VFUOTHLCSA-N
 Ligand Interaction
FUC
Query on FUC

Download SDF File 
Download CCD File 
N, O, P, Q, R, S, T, U, V, W
ALPHA-L-FUCOSE
C6 H12 O5
SHZGCJCMOBCMKK-SXUWKVJYSA-N
 Ligand Interaction
GAL
Query on GAL

Download SDF File 
Download CCD File 
N, O, P, Q, R, S, T, U, V, W
BETA-D-GALACTOSE
C6 H12 O6
WQZGKKKJIJFFOK-FPRJBGLDSA-N
 Ligand Interaction
A2G
Query on A2G

Download SDF File 
Download CCD File 
N, O, P, Q, R, S, T, U, V, W
N-ACETYL-2-DEOXY-2-AMINO-GALACTOSE
C8 H15 N O6
OVRNDRQMDRJTHS-CBQIKETKSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.53 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.181 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 117.799α = 90.00
b = 166.965β = 90.00
c = 57.478γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
REFMACrefinement
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-08-14
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Derived calculations, Version format compliance