1.1.1.339 Biosynthesis of secondary metabolites 1.1.1.339 Metabolic pathways 1.1.1.339 O-Antigen nucleotide sugar biosynthesis 1.1.1.339 Polyketide sugar unit biosynthesis 1.1.1.339 superpathway of dTDP-glucose-derived O-antigen building blocks biosynthesis