This is the N-terminal domain of the alpha chain found in Helicobacter pylori Fucosyltransferase protein which is involved in the production of Lewis x trisaccharide, a major component of lipopolysaccharide. The N-terminal domain contains the catalyst base, Glu-95 which is equivalent to the Asp-100 of other members of the glycosyltransferases-B family. The domain contains the pocket where LacNAc binds. The domain is composed of 2-10 heptad repeats and a conserved N-terminal alpha-beta-alpha motif which has little sequence similarity to the conserved N-terminal motif in other glycosyltransferases [1].

1: Structure and mechanism of Helicobacter pylori fucosyltransferase. A basis for lipopolysaccharide variation and inhibitor design. Sun HY, Lin SW, Ko TP, Pan JF, Liu CL, Lin CN, Wang AH, Lin CH; J Biol Chem. 2007;282:9973-9982. PMID:17251184