Catalyzes the polymerization of lipoteichoic acid (LTA) polyglycerol phosphate, a reaction that presumably uses phosphatidylglycerol (PG) as substrate. Is required for staphylococcal growth and cell division process. Cell wall biogenesis; lipoteichoic acid biosynthesis. Less protein is secreted in a secG or double secG/secY2 mutant (at protein level). Proteolytically cleaved. Belongs to the LTA synthase family.