Part of the ABC transporter DppABCDF involved in dipeptide transport (PubMed:11409543). Responsible for energy coupling to the transport system (Probable). a dipeptide(out) + ATP + H2O = a dipeptide(in) + ADP + H(+) + phosphate The complex is composed of two ATP-binding proteins (DppD and DppF), two transmembrane proteins (DppB and DppC) and a solute-binding protein (DppA). Belongs to the ABC transporter superfamily.