An ATP-binding cassette (ABC) transporter complex made up of a dimer of MsbA. Facilitates the export across the plasma membrane of, amongst others, lipid A and lipopolysaccharide. In contrast to most ABC transporter complexes, each chain of the homodimer contains both the transmembrane domain (TMD) and the cytoplasmic ATP-binding domain (NBD).
Catalysis of the reaction: 2 3-acyl-sn-glycero-1-phospho-(1'-sn-glycerol) = 3-acyl-sn-glycero-1-phospho-(3'-acyl-1'-sn-glycerol) + sn-glycero-1-phospho-(1'-sn-glycerol).
Catalysis of the synthesis of the HKK-1 carbohydrate epitope; adds a sulfate group to a precursor, GlcA-beta-(1->3)-Gal-beta-(1->4)-GlcNAc-beta-(1->R), forming sulfo-3GlcA-beta-(1->3)-Gal-beta-(1->4)-GlcNAc-beta-(1->R).