This family of proteins constists of bacterial multicomponent K+:H+ and Na+:H+ antiporters. The best characterized systems are the PhaABCDEFG system of Rhizobium meliloti which functions in pH adaptation and as a K+ efflux system and the MnhABCDEFG system of Staphylococcus aureus which functions as a Na+:H+ antiporter. [Transport and binding proteins, Cations and iron carrying compounds]
Jiyao W et al.(2023). "The conserved domain database in 2023.",