Part of the ABC transporter complex MetNIQ involved in methionine import. Responsible for energy coupling to the transport system. ATP + H2O + L-methionine(out) = ADP + H(+) + L-methionine(in) + phosphate ATP + D-methionine(out) + H2O = ADP + D-methionine(in) + H(+) + phosphate The complex is composed of two ATP-binding proteins (MetN), two transmembrane proteins (MetI) and a solute-binding protein (MetQ). Belongs to the ABC transporter superfamily. Methionine importer (TC 3.A.1.24) family.