A polyphasic study was undertaken to establish the taxonomic position of a rhizosphere isolate that had been assigned provisionally to the genus Kitasatospora. The organism, isolate F18-98(T), was found to have chemical and morphological properties that were consistent with its classification as a Kitasatospora strain. Direct 16S rDNA sequence data confirmed the taxonomic position of the strain...

A gene that complements argG mutations was cloned from Streptomyces coelicolor and Streptomyces lividans by using pIJ702 as a vector. The recombinant plasmid pMCP25 complemented argG mutations of S. lividans and S. coelicolor. The inserted DNA of pMCP25 was able to hybridize with argG+ strains of S. lividans, S. coelicolor, S. lavendulae and S. alboniger but not with argG mutants of these strains.

FK506 and rapamycin are immunosuppressants that inhibit signalling cascades required for T-cell activation, yet both are natural products of Streptomyces that live in the soil. FK506 and rapamycin also have potent antimicrobial activity against yeast and pathogenic fungi, suggesting a natural role in inhibiting growth of competing micro-organisms. The immunosuppressive and antimicrobial activit...

In this article we briefly review theories about the ecological roles of microbial secondary metabolites and discuss the prevalence of multiple secondary metabolite production by strains of Streptomyces, highlighting results from analysis of the recently sequenced Streptomyces coelicolor and Streptomyces avermitilis genomes. We address this question: Why is multiple secondary metabolite product...

PAISt is a large genomic island located in the chromosome of the plant pathogen Streptomyces turgidiscabies Car8. The island carries clustered virulence genes, transfers to other Streptomyces species, and integrates by site-specific recombination at the 8 bp palindrome TTCATGAA. The palindrome is located at the 3' end of the bacitracin resistance gene (bacA). We demonstrate that PAISt is able t...

Streptomyces is an extremely important bacterium for industry, since approximately two thirds of all antibiotics are synthesized by members of this genus. Furthermore, Streptomycetes produce large numbers of eukaryotic cell differentiation and apoptosis inducers. Streptomyces is a mycelial soil bacterium characterized by a complex developmental cycle that includes programmed cell death (PCD) ph...

With the growing economic significance of some Streptomyces species, the necessity of establishing their precise characteristies in well-defined specific terms becomes of great theoretical and practical importance (Waksman, 1957). The purpose of this paper is to present a comparative study of the main morphological, physiological, and biochemical characteristics of cultures belonging to the Str...

Five strains of Streptomyces (CAI-24, CAI-121, CAI-127, KAI-32 and KAI-90) were earlier reported by us as biological control agents against Fusarium wilt of chickpea caused by Fusarium oxysporum f. sp. ciceri (FOC). In the present study, the Streptomyces were characterized for enzymatic activities, physiological traits and further evaluated in greenhouse and field for their plant growth promoti...

An actinomycete, strain FXJ46(T), was isolated from cypress forest soil in northern China and shown to have chemotaxonomic and morphological properties consistent with streptomycetes. It developed greyish aerial mycelium and pinkish-brown substrate mycelium on oatmeal agar. Phylogenetic analyses based on an almost complete 16S rRNA gene sequence of the strain and on the 120 nucleotide variable ...

conclusions from the results, it was concluded that agricultural lands around pakistan council of scientific and industrial research (pcsir) campus lahore were rich sources of industrially important streptomyces, especially s. avermitilis. results the 10 selected isolates were identified as the avermectin-producing strain by fermentation and characterized on isp2 medium for aerial and reverse s...