New cell walls anionic glycopolymers of the representatives of genus Kribbellaстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Cell walls of four representatives of the genus Kribbella (order Actinomycetales; suborder Propionibacterineae; family Nocardioidaceae) contain each a neutral and an acidic polysaccharides with unusual structures. Common to all four strains studied is a mannan. In the cell wall of the strain Ac-2541, a teichulosonic acid was identified with a monosaccharide component that has not hitherto been found in Gram-positive bacteria, viz., pseudaminic acid, and an unusual linkage type in the polymeric chain, where R = Н (45%), ?-D-Galp3OMe (37%) or ?-D-Galp2,3OMe (18%). The anionic cell wall components of three other strains are represented by teichuronic acids with a rare constituent, viz., a diaminosugar, 2,3-diacetamido-2,3-dideoxyglucopyranose. The structures of their repeating units differ in the nature of the acidic components: >4)-?-D-Manp2,3NAcA-(1>6)-?-D-Glcp2,3NAc-(1> (Ас-2538 and Ас-2540) and >4)-?-D-ManpNAcA-(1>6)-?-D-Glcp2,3NAc-(1> (Ас-2539). The structures of all the glycopolymers were established by chemical and NMR spectroscopic methods; they are identified in Gram-positive bacteria for the first time.