April 21, 2020  |  

Characterization and Complete Genome Analysis of the Carbazomycin B-Producing Strain Streptomyces luteoverticillatus SZJ61.

Members of marine Actinobacteria have been highly regarded as potentially important sources of antimicrobial compounds. Here, we isolated a strain of Actinobacteria, SZJ61, and showed that it inhibits the in vitro growth of fungi pathogenic to plants. This new isolate was identified as Streptomyces luteoverticillatus by morphological, biochemical and genetic analyses. Antifungal compounds were isolated from S. luteoverticillatus strain SZJ61 and characterized as carbazomycin B by nuclear magnetic resonance spectra. We then sequenced the genome of the S. luteoverticillatus SZJ61 strain, which consists of only one 7,367,863 bp linear chromosome that has a G+C content of 72.05%. Thirty-five putative biosynthetic gene clusters for secondary metabolites, including a variety of bioactive products, were found. Mining of the genome sequence information revealed the putative biosynthetic gene cluster of carbazomycin B. This genomic information is valuable for interpreting the biosynthetic mechanisms of diverse bioactive compounds that have potential applications in the pharmaceutical industry.


April 21, 2020  |  

Complete genome sequence of Streptomyces spongiicola HNM0071T, a marine sponge-associated actinomycete producing staurosporine and echinomycin

Streptomyes spongiicola HNM0071T is a novel marine sponge-associated actinomycete with potential to produce antitumor agents including staurosporine and echinomycin. Here, we present the complete genome sequence of S. spongiicola HNM0071, which consists of a linear chromosome of 7,180,417?bp, 5669 protein coding genes, 18 rRNA genes, and 66 tRNA genes. Twenty-seven putative secondary metabolite biosynthetic gene clusters were found in the genome. Among them, the staurosporine and echinomycin gene clusters have been described completely. The complete genome information presented here will enable us to investigate the biosynthetic mechanism of two well-known antitumor antibiotics and to discover novel secondary metabolites with potential antitumor activities.


April 21, 2020  |  

Systematic Identification of Pathogenic Streptomyces sp. AMCC400023 That Causes Common Scab and Genomic Analysis of Its Pathogenicity Island.

Potato scab, a serious soilborne disease caused by Streptomyces spp., occurs in potato-growing areas worldwide and results in severe economic losses. In this paper, the pathogenicity of Streptomyces strain AMCC400023, isolated from potato scabs in Hebei Province, China, was verified systematically by the radish seedling test, the potato tuber slice assay, the potted back experiment, and the detection of phytotoxin thaxtomin A. Morphological, physiological, and biochemical characteristics were determined, and the 16S ribosomal RNA analyses of Streptomyces sp. AMCC400023 were carried out. To obtain the accurate taxonomic status of the pathogen strain, the whole genome was sequenced, and the phylogenetic tree among 31 Streptomyces genomes was formed. The average nucleotide identity (ANI) and in silico DNA-DNA hybridization (isDDH) were analyzed, and at the same time, the toxicity-related genes between Streptomyces sp. AMCC400023 and Streptomyces scabiei were compared, all based on the whole-genome level. All of the data supported that, instead of a member of S. scabiei, test strain Streptomyces sp. AMCC400023 was a distinct phytopathogen of potato common scab, which had a relatively close relationship with S. scabiei while separating clearly from S. scabiei at least in the species level of taxonomic status. The complete pathogenicity island (PAI) composition of Streptomyces sp. AMCC400023 was identified, which contained a toxin region and a colonization region. It was conjectured that the PAI of Streptomyces sp. AMCC400023 might be directly or indirectly acquired from S. scabiei 87-22 by horizontal gene transfer, or at the very least, there was a very close homologous relationship between the two pathogens as indicated by a series of analyses, such as phylogenetic relationships among 31 Streptomyces species, ANI and isDDH analyses, PAI structure mapping, thaxtomin A synthetic gene cluster tree construction, and most important, the collinearity analysis at the genome level.


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