FIG 1.

Gene cluster diagram of the outer core polysaccharides of R1 LPS and K1 capsule. (A) K1 capsular conserved gene cluster of DE058. The dotted line represents the deleted gene neuC. (B) Synthesis of N-acetylneuraminic acid in the K1 capsule and site of the enzyme encoded by each gene. (C) Schematic diagram of the synthesis process of outer core polysaccharides of LPS. Different colors represent different oligosaccharides. The solid arrow represents the direction of outer core polysaccharide synthesis. Dotted arrows represent the sites at which different transferases act, adding different oligosaccharides to the outer core polysaccharide chain.