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:29240795). The complex is probably composed of two ATP-binding proteins (MsmX), two transmembrane proteins (YtcP and YteP) and a solute-binding protein (YtcQ). Deletion of the gene has a negative impact in the utilization of polygalacturonan and rhamnogalacturonan type I. Belongs to the bacterial solute-binding protein 1 family.