Involved in the biosynthesis of the exopolysaccharide acetan, a water-soluble polysaccharide involved in production of bacterial cellulose (BC). di-trans,octa-cis-undecaprenyl phosphate + UDP-alpha-D-glucose = alpha-D-glucosyl di-trans,octa-cis-undecaprenyl diphosphate + UMP Belongs to the bacterial sugar transferase family.