This is a family of lipid-A-disaccharide synthetases, EC:2.4.2.128. These enzymes catalyse the reaction: UDP-2,3-bis(3-hydroxytetradecanoyl) glucosamine + 2,3-bis(3-hydroxytetradecanoyl)-beta-D-glucosaminyl 1-phosphate <=> UDP + 2,3-bis(3-hydroxytetradecanoyl)-D-glucosaminyl-1,6 -beta-D-2,3-bis(3-hydroxytetradecanoyl)-beta-D-glucosaminyl 1-phosphate. These enzymes catalyse the fist disaccharide step in the synthesis of lipid-A-disaccharide.

1: Cloning and expression of genes encoding lipid A biosynthesis from Haemophilus influenzae type b. Servos S, Khan S, Maskell D; Gene 1996;175:137-141. PMID:8917090

2: Nucleotide sequence of the Escherichia coli gene for lipid A disaccharide synthase. Crowell DN, Reznikoff WS, Raetz CR; J Bacteriol 1987;169:5727-5734. PMID:2824445