Catalyzes the formation of UDP-glucose from glucose-1-phosphate and UTP (Probable). This is an intermediate step in the biosynthesis of diglucosyl-diacylglycerol (Glc2-DAG), i.e. the predominant glycolipid found in the S.aureus membrane, which is also used as a membrane anchor for lipoteichoic acid (LTA). alpha-D-glucose 1-phosphate + H(+) + UTP = diphosphate + UDP-alpha-D-glucose Glycolipid metabolism; diglucosyl-diacylglycerol biosynthesis. Belongs to the UDPGP type 2 family.