2NZX image
Entry Detail
PDB ID:
2NZX
Keywords:
Title:
Crystal Structure of alpha1,3-Fucosyltransferase with GDP
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2006-11-27
Release Date:
2007-01-23
Method Details:
Experimental Method:
Resolution:
1.90 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Alpha1,3-fucosyltransferase
Chain IDs:A, B, C
Chain Length:371
Number of Molecules:3
Biological Source:Helicobacter pylori
Primary Citation
Structure and mechanism of Helicobacter pylori fucosyltransferase. A basis for lipopolysaccharide variation and inhibitor design.
J. Biol. Chem. 282 9973 9982 (2007)
PMID: 17251184 DOI: 10.1074/jbc.M610285200

Abstact

Helicobacter pylori alpha1,3-fucosyltransferase (FucT) is involved in catalysis to produce the Lewis x trisaccharide, the major component of the bacteria's lipopolysaccharides, which has been suggested to mimic the surface sugars in gastric epithelium to escape host immune surveillance. We report here three x-ray crystal structures of FucT, including the FucT.GDP-fucose and FucT.GDP complexes. The protein structure is typical of the glycosyltransferase-B family despite little sequence homology. We identified a number of catalytically important residues, including Glu-95, which serves as the general base, and Glu-249, which stabilizes the developing oxonium ion during catalysis. The residues Arg-195, Tyr-246, Glu-249, and Lys-250 serve to interact with the donor substrate, GDP-fucose. Variations in the protein and ligand conformations, as well as a possible FucT dimer, were also observed. We propose a catalytic mechanism and a model of polysaccharide binding not only to explain the observed variations in H. pylori lipopolysaccharides, but also to facilitate the development of potent inhibitors.

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