Probable sugar transporter. Even if its physiological substrate is subject to discussion, it is able to transport glucose and fructose. Does not transport galactose, 2-deoxy-d-glucose and xylose. D-glucose(out) = D-glucose(in) D-fructose(out) = D-fructose(in) Belongs to the major facilitator superfamily. Sugar transporter (TC 2.A.1.1) family. Glucose transporter subfamily. According to some reports, mediates transmembrane transport of glucose and fructose (By similarity). However, another group coud not confirm transporter activity for glucose or fructose (By similarity).