[The carbohydrate-containing cell wall polymers of some species from the cluster "Streptomyces lavendulae"]

The type strains of the species of the cluster “Streptomyces lavendulae” with a low level of DNA–DNA relatedness were found to contain different cell-wall carbohydrate polymers, whereas the species of this cluster with a level of DNA–DNA relatedness of about 60% contain similar or identical carbohydrate polymers. The type strains Streptomyces katraeVKM Ac-1220Tand S. polychromogenesVKM Ac-1207Tsynthesize mannan with different amounts of α-1,2- and α-1,3-substituted mannopyranose units and a small number of 1,3-poly(glycerolphosphate) chains. The cell walls of S. lavendulocolorVKM Ac-215Tand Streptomycessp. VKM Ac-2117 were found to contain a hitherto unknown teichuronic acid, whose repeating unit is a disaccharide consisting of diaminomannuronic acid and N-acetylgalactosamine: → 4)-β-D-ManpNAc3NAcA-(1 → 3)-α-D-GalpNAc-(1 →. In addition, the cell walls of these two streptomycetes contain β-glucosylated 1,5-poly(ribitol phosphate). The cell walls of S. virginiaeVKM Ac-1218Tand S. flavotriciniVKM Ac-1277Tcontain the same poly(glucosyl-glycerolphosphate). The results presented in this paper are in accordance with the DNA–DNA relatedness data and indicate a taxonomic significance of the structure of the cell-wall polysaccharides for the delineation of phenetically related Streptomycesspecies.