Salmonella polysaccharide

We are greatly indebted to S. J. Angyal, J. E. Courtois, G. E. McCasland, M. Nakajima, and T. Postemak for gifts of the cyclohexanepentols mentioned, and to A. M. Staub and G. Bagdian who provided us with the polysaccharide material from Salmonella typhimurium. 

KDO appears to be unique to Gram-negative bacteria. In the LPS that have been studied, KDO residues are situated at the reducing ends of the polysaccharide domains, linking them, by ketosidic bonds, to the fatty-acid-substituted 2-amino-2-deoxy-D-glucosyl disaccharides referred to as lipid A. Fig. 2 is a block diagram indicating the location of KDO in the LPS from Salmonella. 

N. catarrhalis,560 N. perflava,559 Moraxella duplex and Micrococcus calco-aceticus,443 and Escherichia coli,420 Vicari and Kabat,45 in studies of blood-group oligosaccharides, and Hellerqvist and colleagues,53 in an examination of the common core-polysaccharide of Salmonella typhimurium, have used similar methods. The examination of amino sugars as their peracetylated aminodeoxyalditols has also been used by Liideritz and colleagues72 to establish the occurrence of 4-amino-4-deoxy-L-arabinose in Salmonella lipopolysaccharides, and has been extended to aminodeoxyheptoses by Williams and Perry.561... 

One of the most impressive findings has been the discovery of lipid intermediates in the biosynthesis of polysaccharides (see Refs. 2 and 465.) At least two structurally different types of these compounds exist the intermediate may be an isoprenoid alcohol ester of the glycosyl pyrophosphate or the analogous derivative of the glycosyl phosphate. Derivatives of the first type are formed by reaction between the sugar nucleotide and the alcohol phosphate, for example, undecaprenyl phosphate (120), which participates in the biosynthesis of Salmonella lipopolysaccharide.466... 

It is prepared from Vi capsular polysaccharide of Salmonella typhi. Immunity develops 7 to 15 days after injection and protection lasts for three years. 

Bacterial Tuberculosis (BCG) Salmonella typhi Ty21a Salmonella typhi Cholera Vi capsular polysaccharide... 

G. Chatfield, S. Characterization of defined ompR mutants of Salmonella typhi ompR is involved in the regulation of Vi polysaccharide expression. Infect. Immun., 61, 3984-3993 (1994)... 

The method has also been applied to acetylated polysaccharides. Thus, whereas the D-mannopyranose residue in the acetylated lipo-polysaccharide from Salmonella typhi was found to be inert, that in Salmonella Strasbourg was oxidized, demonstrating that the former is a-D-linked and the latter /3-D-linked.154 The D-mannose residues in the acetylated lipopolysaccharide from Klebsiella O-group 3 were found resistant to oxidation, and are consequently a-D-linked."... 

An anti-2-acetamido-2-deoxy-D-mannose immunoglobulin, MOPC 406, is an IgA that binds73 polysaccharides from Salmonella weslaco and Escherichia coli 031. These polysaccharides are known to contain 2-acetamido-2-deoxy-D-mannose,83 and it has been shown that the specificity of this protein is directed towards /3-D-linked 2-acetamido-2-deoxy-D-mannopyranosyl residues.84 Inhibition studies revealed that the apparent affinity of the methyl /3-D-glycoside for the combining region of MOPC 406 is high. 

As may be seen from Table I (see p. 327), MOPC 384 precipitates with the lipopolysaccharides from Proteus mirabilis sp2, Salmonella tranaroa, Escherichia coli 070, and Salmonella telaviv.7s Precipitation with the latter polysaccharide can be inhibited with methyl ct-D-galactopyranoside. No inhibition could be achieved by using p-aminophenyl 1-thio-a-D-galactopyranoside,85 but the specificity of this protein nevertheless appears to be for a-D-linked D-galac-topyranosyl residues. 

CDP-6-deoxy-D-xy/o-hexos-4-ulose (7b) serves as a precursor in the biosynthesis of CDP-3,6-dideoxyhexoses28,168 having the d-ribo (paratose, 3,6-dideoxy- D-glucose ), o-xylo (abequose, 3,6-dideoxy- D-galactose ), and d-arabino (tyvelose, 3,6-dideoxy- D-mannose ) configurations. These monosaccharides are characteristic components of O-specific polysaccharides from Salmonella and Yersinia pseudotuberculosis. 

Bacterial polysaccharides frequently contain D-ribofuranosyl residues as components of their polymeric chains. D-Ribulose S-phosphate was shown to serve as a precursor for the D-ribofuranosyl units in Salmonella T1 antigen,224 but details of the enzymic reactions and the nature of the activated... 

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