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1. (Article ID: 2620)
 
Nagaoka M, Muto M, Yokokura T, Mutai M
Structure of 6-deoxytalose-containing polysaccharide from the cell wall of Bifidobacterium adolescentis
Journal of Biochemistry 103 (1988) 618-621
 
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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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