Fig. 5: Summary of different O-antigen synthesis pathways.

GT stands for glycosyltransferase, and for the purposes of illustration represents all GTs required to generate the O-antigen. [O] represents a repeating unit of the O-antigen, while the subscript represents the number of repeats present (n being an arbitrary integer). Individual sugar units are represented by “S” inside a hexagon, and are shown bound to an arbitrary nucleotide carrier NDP. The lipid carrier is Und-P.