pentosyltransferase activity 4-amino-4-deoxy-L-arabinose transferase activity https://github.com/geneontology/go-ontology/issues/30193 EC:2.4.2.43 Catalysis of the reaction: (Kdo)2-lipid A + 2 4-amino-4-deoxy-alpha-L-arabinopyranosyl di-trans,poly-cis-undecaprenyl phosphate = (beta-L-Ara4N)2-(KDO)2-lipid A + 2 ditrans,polycis-undecaprenyl phosphate. RHEA:35371 GO:0103015 molecular_function MetaCyc:RXN0-2001