Part of the ABC transporter complex UgpABCE involved in sn-glycerol-3-phosphate import. Probably responsible for the translocation of the substrate across the membrane (By similarity). The complex is composed of two ATP-binding proteins (UgpC), two transmembrane proteins (UgpA and UgpE) and a solute-binding protein (UgpB). Belongs to the binding-protein-dependent transport system permease family. Truncated C-terminus.