A hetero-hexameric complex of 2 membrane proteins, A and B, with stoichiometry A4B2. The A and B proteins form a channel through which flow the ions that power the bacterial-type flagellum. They form the stator, or nonrotating portion, of the flagellum motor with the B protein apparently attached to the peptidoglycan cell wall. Examples include the H+ driven MotA-MotB stator complex of Escherichia coli and Salmonella enterica, and the Na+ driven PomA-PomB stator complex of Vibrio and Shewanella species. [ http://www.ncbi.nlm.nih.gov/pubmed/12624192 http://www.ncbi.nlm.nih.gov/pubmed/10572114 http://www.ncbi.nlm.nih.gov/pubmed/24697492 http://www.ncbi.nlm.nih.gov/pubmed/25251856 ]