Figure 1.

Capsule polysaccharide structures and cps loci of serogroup 33 capsule types.A, Symbol Nomenclature for Glycans diagrams of elucidated serogroup 33 PS repeat unit structures. cps-encoded O-acetyltransferases are listed in blue text underneath their assigned O-acetyl substitutions. B, alignment of representative 33F and 33F-1 variant cps loci (i.e., 33F-1a, 33F-1b, and 33F-1c), as noted in parentheses below the strain name to the right. Genes encoding glycosyltransferases (white arrows), Wzx/Wzy enzymes (dark gray arrows), carbohydrate synthetases (horizontally striped arrows), highly conserved biosynthetic elements (light gray arrows), O-acetyltransferases (vertical striped arrows), and pseudogene elements (black arrows) are labeled at the top. Asterisks denote alleles encoding pseudogenes. The percent identity of regions highlighted by gray boxes is noted to the left, between each row. cps, capsule synthesis locus; PS, polysaccharide.