Involved in pectin degradation (PubMed:29240795). Part of the ABC transporter complex YtcQP-YteP involved in the uptake of polygalacturonan and rhamnogalacturonan type I (PubMed:17449691, PubMed:29240795). Responsible for the translocation of the substrate across the membrane (Probable). The complex is probably composed of two ATP-binding proteins (MsmX), two transmembrane proteins (YtcP and YteP) and a solute-binding protein (YtcQ). Up-regulated by growth on type I rhamnogalacturonan. Belongs to the binding-protein-dependent transport system permease family.