Part of the ABC transporter DppABCDF involved in the uptake of various di/tripeptides (PubMed:25338022). Is also involved in the uptake of phaseolotoxin, a toxic tripeptide inhibiting the enzyme ornithine carbamoyltransferase (PubMed:25338022). 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 (DppA1-A5) (PubMed:25338022). Five orthologous SBPs (DppA1-A5) are present in P.aeruginosa, which increases the substrate specificity of the DppBCDF transporter (PubMed:25338022). Deletion of the dppBCDF operon leads to reduced ability to utilize di/tripeptides as nitrogen source. Belongs to the ABC transporter superfamily.