Phosphoglucomutase; Catalyzes the interconversion between glucose-6- phosphate and alpha-glucose-1-phosphate (Probable). This is the first 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) (602 aa)