1887

Abstract

A mutation in that causes the lack of O34-antigen lipopolysaccharide (LPS) in strain AH-3 was identified. It was proved that GalU is a UDP-glucose pyrophosphorylase responsible for synthesis of UDP-glucose from glucose 1-phosphate and UTP. The mutant from this strain showed two types of LPS structures, represented by two bands on LPS gels. The first one (slow-migrating band in gels) corresponds to a rough strain having the complete core, with two significant differences: it lacks the terminal galactose residue from the LPS-core and 4-amino-4-deoxyarabinose residues from phosphate groups in lipid A. The second one (fast-migrating band in gels) corresponds to a deeply truncated structure with the LPS-core restricted to one 3-deoxy---oct-2-ulosonic acid (Kdo) and three ----heptose residues. mutants in several motile mesophilic strains from serotypes O1, O2, O11, O18, O21 and O44 were also devoid of the O-antigen LPS. The mutation reduced to less than 1 % the survival of these strains in serum, decreased the ability of these strains to adhere and reduced by 1.5 or 2 log units the virulence of serotype O34 strains in a septicaemia model in either fish or mice. All the changes observed in the mutants were rescued by the introduction of the corresponding single wild-type gene.

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2007-08-01
2019-11-20
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vol. , part 8, pp. 2393 - 2404

H and C NMR data of oligosaccharides 1 and 2 (chemical shifts, δ, p.p.m.) [ PDF] (20 kb)



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