Abstract
Sugar composition of whole cells and cell wall preparations of the family Pseudonocardiaceae, mycolate-less wall chemotype IV actinomycetes, was examined to clarify the taxonomic significance of cell-wall sugars. Among the strains of the genera examined, cell wall types of Actinopolyspora, Saccharopolyspora and Amycolata were confirmed to be chemotype IV/A, however, those of Pseudonocardia, Amycolatopsis, Saccharomonospora, Pseudoamycolata, Actinokineospora and Kibdelosporangium were found to be III/A, and that of Saccharothrix to be III /A or III/C. Thus, the family Pseudonocardiaceae, which was proposed for the closely related genera on the basis of 16S rRNA sequencing studies, was indicated to include organisms with wall chemotypes III and IV, and the description of the family should therefore be emended.
