Probably part of an ABC transporter complex that could be involved in peptide import. Probably responsible for energy coupling to the transport system (By similarity). The complex is composed of two ATP-binding proteins (BAB2_1052 and BAB2_1053), two transmembrane proteins (BAB2_1050 and BAB2_1051) and a solute-binding protein (BAB2_1049). Belongs to the ABC transporter superfamily.