New glycopolymers containing both D- and L-rhamnopyranoses from Rathayibacter iranicus VKM Ac-1602T cell wallстатья
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Дата последнего поиска статьи во внешних источниках: 9 октября 2019 г.
Аннотация:The cell wall of Rathayibacter iranicus VKM Ac-1602T (family Microbacteriaceae, class Actinobacteria) is characterised by the absence of phosphate-containing and by the presence of two rhamnose-containing glycopolymers. The first is a branched rhamnomannan, in which 60% of mannose residues of the main chain are glycosylated by terminal mannose residues: →2)-α-D-Rhap-(1→3)-α-[α-D-Manp-(1→6)]-D-Manp-(1→. The second is a branched teichuronic acid, in which all the rhamnose residues of the main chain are glycosylated by glucose residues:→3)-α-[α-D-Glcp-(1→2)]-L-Rhap-(1→4)-β-D-GlcpA-(1→2)-α-D-Manp-(1→3)-α-D-Galp-(1→3)-β-D-Glcp-(1→. Both glycopolymers have the unique structures and described in the cell walls of Gram-positive bacteria for the first time. The obtained data allow for a more complete characterisation of the cell wall of the microorganism under investigation and can serve as a phenotypic characterisation of this bacterium. The glycopolymer structures were established using chemical and nuclear magnetic resonance (NMR) spectroscopy methods.