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1. (Article ID: 762)
 
Cescutti P, Impallomeni G, Garozzo D, Sturiale L, Herasimenka Y, Lagatolla C, Rizzo R
Exopolysaccharides produced by a clinical strain of Burkholderia cepacia isolated from a cystic fibrosis patient
Carbohydrate Research 338(23) (2003) 2687-2695
 

Burkholderia cepacia is an opportunistic pathogen involved in pulmonary infections related to cystic fibrosis. A clinical strain, BTS13, was isolated and the production of exopolysaccharides was tested growing the bacteria on two different media, one of which was rich in mannitol as carbon source. The primary structure of the polysaccharides was determined using mostly mass spectrometry and NMR spectroscopy. On both media an exopolysaccharide having the following repeating unit was produced: →5)-β-Kdop-(2→3)-β-D-Galp2Ac-(1→4)-α-D-Galp-(1→3)-β-D-Galp-(1→. This polysaccharide has already been described as the biosynthetic product of another Burkholderia species, B. pseudomallei, the microbial agent causing melioidosis. In addition to this, when grown on the mannitol-rich medium, B. cepacia strain BTS13 produced another polysaccharide that was established to be levan: →6)-β-D-Fruf-(2→. The content of levan was about 20% (w/w) of the total amount of polymers. The ability of B. cepacia to produce these two exopolysaccharides opens new perspectives in the investigation of the role of polysaccharides in lung infections.

Burkholderia cepacia, NMR spectroscopy, exopolysaccharide, cystic fibrosis, Structures, MALDIMS

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2. (Article ID: 4050)
 
Knirel YA, Shevelev SD, Perepelov AV
Higher aldulosonic acids: components of bacterial glycans
Mendeleev Communications 21(4) (2011) 173-182
 

Recent data on the natural occurrence, chemistry, and biochemistry of C8 and C9 aldulosonic acids (3-deoxy-d-manno-oct-2-ulosonic acid, sialic acids, N-acyl derivatives of 5,7-diamino-3,5,7,9-tetradeoxynon-2-ulosonic acids, and some others) as well as on the structures and biological significance of bacterial glycans containing these higher acidic monosaccharides are summarized.

structure, Bacterial, glycan, aldulosonic acid, higher acidic monosaccharides, sialic acids

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