Part of the ABC transporter complex XylFGH involved in xylose import. Responsible for energy coupling to the transport system (Probable). The XylFGH system can also transport ribose in absence of xylose. ATP + D-xylose(out) + H2O = ADP + D-xylose(in) + H(+) + phosphate The complex is composed of two ATP-binding proteins (XylG), two transmembrane proteins (XylH) and a solute-binding protein (XylF). Belongs to the ABC transporter superfamily. Xylose importer (TC 3.A.1.2.4) family.