sn-glycerol-3-phosphate and glycerophosphoryl diester-binding protein interacts with the binding protein-dependent transport system UgpACE. 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 bacterial solute-binding protein 1 family.