Required for maximal bacterial cellulose synthesis. Glycan metabolism; bacterial cellulose biosynthesis. The genes bscA, bcsB, bcsZ and bcsC are constitutively transcribed but cellulose synthesis occurs only when DgcC, a putative transmembrane protein regulated by CsgD, is expressed. Cellulose production is abolished in E.coli K12. Belongs to the AcsC/BcsC family.