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The role of lipooligosaccharide in the biological activity of Moraxella bovis strains Epp63, Mb25 and L183/2, and isolation of capsular polysaccharide from L183/2. | LitMetric
The Gram-negative bovine pathogen Moraxella bovis is a causative agent of Infectious bovine keratoconjunctivitis, 'pink-eye' that affects cattle. Here we report that strain L183/2 has the same capsular polysaccharide (CPS) of unsulfated chondroitin, as does strain Mb25, whereas strain Epp63 does not express CPS. NMR analysis of the oligosaccharides (OS) derived from the lipooligosaccharides (LOS) in these three strains by NMR has shown that strain Mb25 and Epp63 have the same OS structure with a terminal N-acetylgalactosamine ((1S)-GalaNAc) residue →4,6-linked. Strain L183/2 lacks the (1 S)-GalaNAc residue. The biological role of M. bovis LOS was assessed by comparing the LOS from strains Epp63, Mb25 and L183/2 and truncated Epp63 LOS variants. LOS truncation affected M. bovis growth rate, susceptibility to antibiotics, detergents, bovine serum bactericidal activity, endotoxicity and adherence to HeLa cells.
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