Structure of the capsular polysaccharide of Klebsiella serotype K79

Escherichia coli serotype K44: an acidic capsular polysaccharide containing two 2-acetamido-2-deoxyhexoses

The structure of the capsular polysaccharide from Escherichia coli O8:K44 (A):H- (K44 antigen) has been established using the techniques of methylation, beta-elimination, deamination, and Smith degradation. N.m.r. spectroscopy (13C and 1H) was used extensively to establish the nature of the anomeric linkages of the polysaccharide and of oligosaccharides derived through degradative procedures. The K antigen is comprised of repeating units of the linear tetrasaccharide shown. This acidic polysaccharide represents the first instance of an E. coli K antigen in this series (group A) that has been found to contain two different 2-acetamido-2-deoxyhexoses.

Structural investigation of the capsular polysaccharide of Klebsiella serotype K35

The structure of the capsular polysaccharide (K antigen) of Klebsiella K35 has been established as having the pentasaccharide repeating unit shown ("four plus one" type). The structural investigation utilized the techniques of methylation, beta-elimination, Smith degradation, and partial hydrolysis. N.m.r. spectroscopy (1H and 13C) was used extensively to establish the configurations of the anomeric linkages and to delineate the sequence of the sugars in the structure of the polysaccharide. (Formula: see text).