Protein glycosylation of the cell division machinery. Schematic overview of the cell division machinery of L. rhamnosus. PBP1A, PBP1B, PBPB2A and MurG are predicted to be putative GTs. Our network-based analysis predicted PBP3, FtsI and PBP2B as putative substrates of the indicated GTs. The Msp1 cell wall hydrolase is the experimentally validated glycoprotein in L. rhamnosus GG .