UDP-glycosyltransferase activity lipid-A-disaccharide synthase activity https://github.com/geneontology/go-ontology/issues/30154 https://github.com/geneontology/go-ontology/issues/30193 Catalysis of the reaction: a lipid X + a UDP-2-N,3-O-bis[(3R)-3-hydroxyacyl]-alpha-D-glucosamine = a lipid A disaccharide + UDP + H+. MetaCyc:RXN-22484 KEGG_REACTION:R04606 RHEA:22668 UDP-2,3-bis(3-hydroxytetradecanoyl)glucosamine:2,3-bis-(3-hydroxytetradecanoyl)-beta-D-glucosaminyl-1-phosphate 2,3-bis(3-hydroxytetradecanoyl)-glucosaminyltransferase activity GO:0008915 molecular_function RHEA:67828 EC:2.4.1.182 hexosyltransferase activity