A polymer with a backbone of 3‐deoxy‐d‐glycero‐d‐galacto‐non‐2‐ulopyranosonic acid, a teichuronic acid, and a β‐glucosylated ribitol teichoic acid in the cell wall of plant pathogenic Streptomyces sp. VKM Ac‐2124

Structures of cell wall anionic polymers of the strain Streptomyces sp. VKM Ac‐2124, a causative agent of potato scab, which is phylogenetically the closest to plant pathogenic species S. setonii and S. caviscabies, were studied. The strain contains three anionic glycopolymers, viz., a teichuronic acid with a disaccharide repeating unit →6)‐α‐d‐Glcp‐(1→4)‐β‐d‐ManpNAc3NAcA‐(1→, a β‐glucosylated polymer of 3‐deoxy‐d‐glycero‐d‐galacto‐non‐2‐ulopyranosonic acid (Kdn), and a β‐glucosylated 1,5‐poly(ribitol phosphate). The strain studied is the second representative of plant pathogenic streptomycetes inducing potato scab disease, the cell wall anionic polymers of which were shown to contain a Kdn‐polymer. Presumably, the presence of Kdn‐containing structures in the surface regions of pathogens is essential for their efficient attachment to host plant cells.