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1. (Article ID: 4124)
 
Turska-Szewczuk A, Guz L, Lindner B, Pietras H, Russa R, Holst O
Structural characterization of the O-specific polysaccharide from the lipopolysaccharide of the fish pathogen Aeromonas bestiarum strain P1S
Carbohydrate Research 346(6) (2011) 815-821
 

The O-specific polysaccharide obtained by mild-acid degradation of lipopolysaccharide of Aeromonas bestiarum P1S was studied by sugar and methylation analyses along with (1)H and (13)C NMR spectroscopy. The sequence of the sugar residues was determined using (1)H,(1)H NOESY and (1)H,(13)C HMBC experiments. The O-specific polysaccharide was found to be a high-molecular-mass polysaccharide composed of tetrasaccharide repeating units of the structure Since small amounts of a terminal Quip3N residue were identified in methylation analysis, it was assumed that the elucidated structure also represented the biological repeating unit of the O-specific polysaccharide.

Lipopolysaccharide, O-specific polysaccharide, 3-hydroxybutyric acid, Aeromonas bestiarum

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2. (Article ID: 6301)
 
Qin CJ, Ding MR, Tian GZ, Zou XP, Fu JJ, Hu J, Yin J
Chemical approaches towards installation of rare functional groups in bacterial surface glycans
Chinese Journal of Natural Medicines = Zhongguo Tianran Yaowu 20(6) (2022) 401-420
 

Bacterial surface glycans perform a diverse and important set of biological roles, and have been widely used in the treatment of bacterial infectious diseases. The majority of bacterial surface glycans are decorated with diverse rare functional groups, including amido, acetamidino, carboxamido and pyruvate groups. These functional groups are thought to be important constituents for the biological activities of glycans. Chemical synthesis of glycans bearing these functional groups or their variants is essential for the investigation of structure-activity relationships by a medicinal chemistry approach. To date, a broad choice of synthetic methods is available for targeting the different rare functional groups in bacterial surface glycans. This article reviews the structures of naturally occurring rare functional groups in bacterial surface glycans, and the chemical methods used for installation of these groups.

chemical synthesis, acetamidino group, amido group, bacterial surface glycan, carboxamido group, pyruvyl ketal

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