Part of the ABC transporter complex XacGHIJK involved in the uptake of xylose and arabinose (PubMed:31089701). Responsible for the translocation of the substrate across the membrane (Probable). The complex is composed of two ATP-binding proteins (XacJ and XacK), two transmembrane proteins (XacH and XacI) and a solute-binding protein (XacG). Transcriptionally up-regulated by both L-arabinose and D-xylose via the pentose-specific regulator XacR. Belongs to the binding-protein-dependent transport system permease family.