This entry represents the catalytic C-terminal domain of the LpxI enzyme that is involved in biosynthesis of lipid A. Specifically it carried out the hydrolysis of UDP-2,3-diacyl- glucosamine. This step is either carried out by LpxI or LpxH [1]. This domain comprises a five-stranded mixed beta-sheet bracketed by one alpha-helix on one side and three on the other. This domain is structurally related to a superfamily that includes cytosine deaminase [1].

1: LpxI structures reveal how a lipid A precursor is synthesized. Metzger LE 4th, Lee JK, Finer-Moore JS, Raetz CR, Stroud RM; Nat Struct Mol Biol. 2012;19:1132-1138. PMID:23042606