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1. (Article ID: 1040)
 
Nagaoka M, Shibata H, Kimura I, Hashimoto S, Kimura K, Sawada H, Yokokura T
Structural studies on a cell wall polysaccharide from Bifidobacterium longum YIT4028
Carbohydrate Research 274 (1995) 245-249
 

The major fraction of rhamnogalactan was isolated from the cell wall of Bifidobacterium longum YIT4028 by treatment with N-acetylmuramidase. This polysaccharide was composed of rhamnose and galactose in a molar ratio of about 2:3. The 13C NMR spectrum indicated that it contained a pentasaccharides repeating unit. This observation, and the results of Smith degradation, partial acid hydrolysis and methylation analysis led to the conclusion that its structure is [formula: see text]

structural, polysaccharide, cell, cell wall, structural studies, Bifidobacterium, cell wall polysaccharide, Bifidobacterium longum

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2. (Article ID: 4682)
 
Hidalgo-Cantabrana C, Sanchez B, Milani C, Ventura M, Margolles A, Ruas-Madiedo P
Genomic Overview and Biological Functions of Exopolysaccharide Biosynthesis in Bifidobacterium spp
Applied and Environmental Microbiology 80(1) (2014) 9-18
 

For many years, bacterial exopolysaccharides (EPS) have received considerable scientific attention, mainly due to their contribution to biofilm formation and, above all, because EPS are potential virulence factors. In recent times, interest in EPS research has enjoyed a welcome boost thanks to the discovery of their ability to mediate communication processes with their surrounding environment and to their contribution to host health maintenance. In this review, we provide a fresh perspective on the genetics and activity of these polymers in members of the Bifidobacterium genus, a common gut inhabitant of humans and animals that has been associated with several health-promoting effects. Bifidobacteria can use EPS to protect themselves against the harsh conditions of the gastrointestinal tract, thus improving their persistence in the host. Indeed, the relevant function of EPS for bifidobacteria is underlined by the fact that most genomes sequenced until now contain genes related to EPS biosynthesis. A high interspecies variability in the number of genes and structural organization is denoted among species/subspecies; thus, eps clusters in this genus do not display a consensus genetic architecture. Their different G+C content compared to that of the whole genome suggests that eps genes have been acquired by horizontal transfer. From the host perspective, EPS-producing bifidobacteria are able to trigger both innate and adaptive immune responses, and they are able to modulate the composition and activity of the gut microbiota. Thus, these polymers seem to be critical in understanding the physiology of bifidobacteria and their interaction with the host.

cluster, exopolysaccharide, Bifidobacterium, immune response, virulence factor, Biofilm, Bacterial exopolysaccharides, EPS biosynthesis

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