Probably part of an ABC transporter complex that could be involved in peptide import. Probably responsible for the translocation of the substrate across the membrane (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 binding-protein-dependent transport system permease family.