2.4.1.182 | a UDP-2-N,3-O-bis[(3R)-3-hydroxyacyl]-alpha-D-glucosamine + a lipid X = UDP + a lipid A disaccharide |
enzyme LpxB catalyzes the nucleophilic attack of the 6'-hydroxyl of lipid X (1) on the anomeric carbon of UDP-DAG (2) with UDP as the leaving group. As for other inverting GT-B enzymes, this reaction is thought to proceed by an SN2 mechanism |
759836 |