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 (BMEII0205 and BMEII0206), two transmembrane proteins (BMEII0207/BMEII0208 and BMEII0209) and a solute-binding protein (BMEII0210). Belongs to the ABC transporter superfamily.