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October 16, 2017

De novo assembly of genomes from long sequence reads reveals uncharted territories of Propionibacterium freudenreichii.

Propionibacterium freudenreichii is an industrially important bacterium granted the Generally Recognized as Safe (the GRAS) status, due to its long safe use in food bioprocesses. Despite the recognized role in the food industry and in the production of vitamin B12, as well as its documented health-promoting potential, P. freudenreichii remained poorly characterised at the genomic level. At present, only three complete genome sequences are available for the species.We used the PacBio RS II sequencing platform to generate complete genomes of 20 P. freudenreichii strains and compared them in detail. Comparative analyses revealed both sequence conservation and genome organisational diversity among…

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October 1, 2017

Complete genome of Brachybacterium sp. P6-10-X1 isolated from deep-sea sediments of the Southern Ocean

Brachybacterium sp. P6-10-X1 is a rare actinobacterium isolated from deep-sea sediments in the Southern Ocean. To explore the potential of natural product biosynthesis, the genome was completely sequenced. It contained a circular chromosome of 4,385,603 bp with an average GC content of 70.9%. Genome mining revealed four biosynthetic gene clusters potentially producing new natural products.

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July 25, 2017

Complete genome sequence of the sand-sediment actinobacterium Nocardioides dokdonensis FR1436(T).

Nocardioides dokdonensis, belonging to the class Actinobacteria, was first isolated from sand sediment of a beach in Dokdo, Korea, in 2005. In this study, we determined the genome sequence of FR1436, the type strain of N. dokdonensis, and analyzed its gene contents. The genome sequence is the second complete one in the genus Nocardioides after that of Nocardioides sp. JS614. It is composed of a 4,376,707-bp chromosome with a G + C content of 72.26%. From the genome sequence, 4,104 CDSs, three rRNA operons, 51 tRNAs, and one tmRNA were predicted, and 71.38% of the genes were assigned putative functions. Through the…

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May 10, 2017

Rifamorpholines A-E, potential antibiotics from locust-associated actinobacteria Amycolatopsis sp. Hca4.

Cultivation of locust associated rare actinobacteria, Amycolatopsis sp. HCa4, has provided five unusual macrolactams rifamorpholines A-E. Their structures were determined by interpretation of spectroscopic and crystallographic data. Rifamorpholines A-E possess an unprecedented 5/6/6/6 ring chromophore, representing a new subclass of rifamycin antibiotics. The biosynthetic pathway for compounds 1-5 involves a key 1,6-cyclization for the formation of the morpholine ring. Compounds 2 and 4 showed potent activities against methicillin-resistant Staphylococcus aureus (MRSA) with MICs of 4.0 and 8.0 µM, respectively.

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April 27, 2017

Complete genome sequence of Tessaracoccus sp. strain T2.5-30 isolated from 139.5 meters deep on the subsurface of the Iberian Pyritic Belt.

Here, we report the complete genome sequence of Tessaracoccus sp. strain T2.5-30, which consists of a chromosome with 3.2 Mbp, 70.4% G+C content, and 3,005 coding DNA sequences. The strain was isolated from a rock core retrieved at a depth of 139.5 m in the subsurface of the Iberian Pyritic Belt (Spain). Copyright © 2017 Leandro et al.

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February 14, 2017

Genomic data mining of the marine actinobacteria Streptomyces sp. H-KF8 unveils insights into multi-stress related genes and metabolic pathways involved in antimicrobial synthesis.

Streptomyces sp. H-KF8 is an actinobacterial strain isolated from marine sediments of a Chilean Patagonian fjord. Morphological characterization together with antibacterial activity was assessed in various culture media, revealing a carbon-source dependent activity mainly against Gram-positive bacteria (S. aureus and L. monocytogenes). Genome mining of this antibacterial-producing bacterium revealed the presence of 26 biosynthetic gene clusters (BGCs) for secondary metabolites, where among them, 81% have low similarities with known BGCs. In addition, a genomic search in Streptomyces sp. H-KF8 unveiled the presence of a wide variety of genetic determinants related to heavy metal resistance (49 genes), oxidative stress (69 genes) and…

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February 10, 2017

Complete genome of Streptomyces hygroscopicus subsp. limoneus KCTC 1717 (=KCCM 11405), a soil bacterium producing validamycin and diverse secondary metabolites.

Streptomyces hygroscopicus subsp. limoneus is a Gram-positive, aerobic, aerial mycelial, spore-forming bacterium that was first isolated from a soil sample in Akashi City, Hyogo Prefecture, Japan. We here report the complete genome of S. hygroscopicus subsp. limoneus KCTC 1717 (=KCCM 11405=IFO 12704=ATCC 21432), which consists of 10,537,932bp (G+C content of 71.96%) with two linear chromosomes, 8983 protein-coding genes, 67 tRNAs and 6 rRNA operons. Genes related to biosynthesis of validamycin, valienamine and diverse secondary metabolites were detected in this genome. Genomic data is thus expected to considerably improve our understanding of how industrially important aminocyclitols are biosynthesized by microbial cells.…

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February 9, 2017

Genome sequence of Streptomyces sp. H-KF8, a marine actinobacterium isolated from a northern Chilean Patagonian fjord.

Streptomyces sp. H-KF8 is a fjord-derived marine actinobacterium capable of producing antimicrobial activity. Streptomyces sp. H-KF8 was isolated from sediments of the Comau fjord, located in the northern Chilean Patagonia. Here, we report the 7.7-Mb genome assembly, which represents the first genome of a Chilean marine actinobacterium. Copyright © 2017 Undabarrena et al.

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January 17, 2017

Molecules to ecosystems: Actinomycete natural products in situ.

Actinomycetes, filamentous actinobacteria found in numerous ecosystems around the globe, produce a wide range of clinically useful natural products (NP). In natural environments, actinomycetes live in dynamic communities where environmental cues and ecological interactions likely influence NP biosynthesis. Our current understating of these cues, and the ecological roles of NP, is in its infancy. We postulate that understanding the ecological context in which actinomycete metabolites are made is fundamental to advancing the discovery of novel NP. In this review we explore the ecological relevance of actinomycetes and their secondary metabolites from varying ecosystems, and suggest that investigating the ecology of…

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December 15, 2016

High-quality draft genome sequence of the actinobacterium Nocardia terpenica IFM 0406, producer of the immunosuppressant brasilicardins, using Illumina and PacBio technologies.

The bacterium Nocardia terpenica IFM 0406 is known as the producer of the immunosuppressant brasilicardin A. Here, we report the completely sequenced genome of strain IFM 0406, which facilitates the heterologous expression of the brasilicardin biosynthetic gene cluster but also unveils the intriguing biosynthetic capacity of the strain to produce secondary metabolites. Copyright © 2016 Buchmann et al.

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September 30, 2016

Complete genome sequence of Brevibacterium linens BS258, a potential marine Actinobacterium for environmental remediation via microbially induced calcite precipitation

Brevibacterium linens BS258 is a urease positive actinobacterium isolated from marine sediment of China Yellow Sea, which demonstrated to have strong capability of calcite precipitation and bioremediation of heavy metal pollution. Here, we report the complete genome sequence of this strain, which might provide a lot of valuable information for environmental remediation, wastewater treatment and atmospheric CO2 sequestration.

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May 7, 2016

Complete genome sequence of the Streptomyces sp. strain CdTB01, a bacterium tolerant to cadmium.

Streptomyces sp. Strain CdTB01, which is tolerant to high concentrations of heavy metals, particularly cadmium, was isolated from soil contaminated with heavy metals. Two contigs with total genome size of 10.19Mb were identified in the whole genome sequencing and assembly, and numerous homologous genes known to be involved in heavy metal resistance were found in the genome. Copyright © 2016 Elsevier B.V. All rights reserved.

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