FIG. 2.

Deduced structure of the LPS from CWG303 (waaG). The two major oligosaccharides observed after complete deacylation of CWG303 LPS differ only in the presence or absence of a phosphate (P) residue on Hep residue E (R = OH in OS-1; R = P in OS-2). The major oligosaccharides after mild acid hydrolysis of CWG303 LPS again differ only by phosphorylation on Hep residue E (R = OH in OS-3; R = P or 2-aminoethyl diphosphate in OS-4). The P substitution on Hep residue E (HepI) occurs in about 40% of LPS molecules, with 30% of these P residues being further modified by PEtN.