Part of the high-affinity ABC transporter complex ScaABC involved in manganese import. Probably responsible for energy coupling to the transport system. Essential for growth under Mn(2+)-limiting conditions. ATP + H2O + Mn(2+)(out) = ADP + H(+) + Mn(2+)(in) + phosphate The complex is composed of two ATP-binding proteins (ScaC), two transmembrane proteins (ScaB) and a solute-binding protein (ScaA). Inactivation of the gene results in both impaired growth and strong inhibition of Mn(2+) uptake. Belongs to the ABC transporter superfamily.