ID 7.5.2.14 DE ABC-type homopolymeric O-antigen exporter. CA ATP + a lipid-linked O antigencytosol + H2O = ADP + phosphate + a lipid- CA linked O antigenperiplasm. CC -!- Unlike heteropolymeric O antigens, which are polymerized in the CC periplasm by EC 2.4.99.27, homopolymeric O antigens are polymerized CC inside the cytoplasm by a progressive transfer of sugar monomers to a CC growing chain attached to a polyprenyl diphosphate membrane anchor. CC -!- When the chain reaches its full length it is transported across the CC cytoplasmic membrane by this ABC-type transporter, which consists of CC an ATP-binding subunit (Wzt) and an integral membrane protein (Wzm). CC -!- Wzm proteins are poorly conserved in their primary sequence. CC -!- Once in the periplasm, the O antigen is ligated to the lipid A-core CC complex by EC 2.4.99.26. //