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As part of an antibiotic-screening programme, an actinomycete, designated strain SPRT, was isolated from soil collected from the banks of the Umgeni River, KwaZulu-Natal Province, South Africa. The isolate produced branching vegetative mycelia with sporangiophores bearing sporangia developing at a late stage of growth. The sporangia contained smooth, almond-shaped, non-motile spores. Strain SPRT exhibited antibiosis against various Gram-positive and Gram-negative bacteria, including Enterococcus faecium VanA (a vancomycin-resistant strain), Mycobacterium aurum A+ and Escherichia coli ATCC 25922. The chemotaxonomic characteristics of the strain, with the exception of the phospholipid pattern, corresponded with those of the members of the family Streptomycetaceae Waksman and Henrici 1943. Furthermore, phylogenetic analysis based on 16S rRNA genes showed that the strain was closely related to members of the genus Streptomyces, which supports its classification in the family Streptomycetaceae. Thus strain SPRT represents a novel species of the genus Streptomyces, for which the name Streptomyces polyantibioticus sp. nov. is proposed. The type strain is SPRT (=DSM 44925T=NRRL B-24448T).
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International Journal of Systematic and Evolutionary Microbiology vol. 59 , part 6, pp. 1302 - 1309
Supplementary Figure S1. Southern blot showing the rRNA operon copy number for strain SPR T. [PDF](20 KB)