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Friday, July 19, 2019

Discovery and biosynthesis of gladiolin: A Burkholderia gladioli antibiotic with promising activity against Mycobacterium tuberculosis.

An antimicrobial activity screen of Burkholderia gladioli BCC0238, a clinical isolate from a cystic fibrosis patient, led to the discovery of gladiolin, a novel macrolide antibiotic with potent activity against Mycobacterium tuberculosis H37Rv. Gladiolin is structurally related to etnangien, a highly unstable antibiotic from Sorangium cellulosum that is also active against Mycobacteria. Like etnangien, gladiolin was found to inhibit RNA polymerase, a validated drug target in M. tuberculosis. However, gladiolin lacks the highly labile hexaene moiety of etnangien and was thus found to possess significantly increased chemical stability. Moreover, gladiolin displayed low mammalian cytotoxicity and good activity against several M.…

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Friday, July 19, 2019

Gapless genome assembly of Colletotrichum higginsianum reveals chromosome structure and association of transposable elements with secondary metabolite gene clusters.

The ascomycete fungus Colletotrichum higginsianum causes anthracnose disease of brassica crops and the model plant Arabidopsis thaliana. Previous versions of the genome sequence were highly fragmented, causing errors in the prediction of protein-coding genes and preventing the analysis of repetitive sequences and genome architecture. Here, we re-sequenced the genome using single-molecule real-time (SMRT) sequencing technology and, in combination with optical map data, this provided a gapless assembly of all twelve chromosomes except for the ribosomal DNA repeat cluster on chromosome 7. The more accurate gene annotation made possible by this new assembly revealed a large repertoire of secondary metabolism (SM)…

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Friday, July 19, 2019

Linking secondary metabolites to gene clusters through genome sequencing of six diverse Aspergillus species.

The fungal genus ofAspergillusis highly interesting, containing everything from industrial cell factories, model organisms, and human pathogens. In particular, this group has a prolific production of bioactive secondary metabolites (SMs). In this work, four diverseAspergillusspecies (A. campestris,A. novofumigatus,A. ochraceoroseus, andA. steynii) have been whole-genome PacBio sequenced to provide genetic references in threeAspergillussections.A. taichungensisandA. candidusalso were sequenced for SM elucidation. ThirteenAspergillusgenomes were analyzed with comparative genomics to determine phylogeny and genetic diversity, showing that each presented genome contains 15-27% genes not found in other sequenced Aspergilli. In particular,A. novofumigatuswas compared with the pathogenic speciesA. fumigatusThis suggests thatA. novofumigatuscan produce most of…

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Sunday, July 7, 2019

Complete genome sequence of the unclassified iron-oxidizing, chemolithoautotrophic Burkholderiales bacterium GJ-E10, isolated from an acidic river.

Burkholderiales bacterium GJ-E10, isolated from the Tamagawa River in Akita Prefecture, Japan, is an unclassified, iron-oxidizing chemolithoautotrophic bacterium. Its single circular genome, consisting of 3,276,549 bp, was sequenced by using three types of next-generation sequencers and the sequences were then confirmed by PCR-based Sanger sequencing. Copyright © 2015 Fukushima et al.

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Sunday, July 7, 2019

Analysis of a draft genome sequence of Kitasatospora cheerisanensis KCTC 2395 producing bafilomycin antibiotics.

Kitasatospora cheerisanensis KCTC 2395, producing bafilomycin antibiotics belonging to plecomacrolide group, was isolated from a soil sample at Mt. Jiri, Korea. The draft genome sequence contains 8.04 Mb with 73.6% G+C content and 7,810 open reading frames. All the genes for aerial mycelium and spore formations were confirmed in this draft genome. In phylogenetic analysis of MurE proteins (UDP-N-acetylmuramyl-L-alanyl-D-glutamate:DAP ligase) in a conserved dcw (division of cell wall) locus, MurE proteins of Kitasatospora species were placed in a separate clade between MurEs of Streptomyces species incorporating LL-diaminopimelic acid (DAP) and MurEs of Saccharopolyspora erythraea as well as Mycobacterium tuberculosis ligating…

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Sunday, July 7, 2019

Gut symbionts from distinct hosts exhibit genotoxic activity via divergent colibactin biosynthetic pathways.

Secondary metabolites produced by nonribosomal peptide synthetase (NRPS) or polyketide synthase (PKS) pathways are chemical mediators of microbial interactions in diverse environments. However, little is known about their distribution, evolution, and functional roles in bacterial symbionts associated with animals. A prominent example is “colibactin”, a largely unknown family of secondary metabolites produced by Escherichia coli via a hybrid NRPS-PKS biosynthetic pathway, inflicting DNA damage upon eukaryotic cells and contributing to colorectal cancer and tumor formation in the mammalian gut. Thus far, homologs of this pathway have only been found in closely related Enterobacteriaceae, while a divergent variant of this gene…

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Sunday, July 7, 2019

Complete genome sequence of the cyclohexylamine-degrading Pseudomonas plecoglossicida NyZ12.

Pseudomonas plecoglossicida NyZ12 (CCTCC AB 2015057), a Gram-negative bacterium isolated from soil, has the ability to degrade cyclohexylamine. The complete genome sequence of this strain (6,233,254bp of chromosome length) is presented, with information about the genes of characteristic enzymes responsible for cyclohexylamine oxidation to cyclohexanone and the integrated gene cluster for the metabolic pathway of cyclohexanone oxidation to adipate. Copyright © 2015 Elsevier B.V. All rights reserved.

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Sunday, July 7, 2019

Complete genome sequence of Bacillus amyloliquefaciens strain BH072, isolated from honey.

The genome of Bacillus amyloliquefaciens strain BH072, isolated from a honey sample and showing strong antimicrobial activity against plant pathogens, is 4.07 Mb and harbors 3,785 coding sequences (CDS). Several gene clusters for nonribosomal synthesis of antimicrobial peptides and a complete gene cluster for biosynthesis of mersacidin were detected. Copyright © 2015 Zhao et al.

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Sunday, July 7, 2019

Draft genome sequence of Kitasatospora griseola strain MF730-N6, a bafilomycin, terpentecin, and satosporin producer.

We report here the draft genome sequence of Kitasatospora griseola strain MF730-N6, a known producer of bafilomycin, terpentecin, and satosporins. The current assembly comprises 8 contigs covering 7.97 Mb. Genome annotation revealed 7,225 protein coding sequences, 100 tRNAs, 40 rRNA genes, and 23 secondary metabolite biosynthetic gene clusters. Copyright © 2015 Arens et al.

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Sunday, July 7, 2019

Dissecting the fungal biology of Bipolaris papendorfii: from phylogenetic to comparative genomic analysis.

Bipolaris papendorfii has been reported as a fungal plant pathogen that rarely causes opportunistic infection in humans. Secondary metabolites isolated from this fungus possess medicinal and anticancer properties. However, its genetic fundamental and basic biology are largely unknown. In this study, we report the first draft genome sequence of B. papendorfii UM 226 isolated from the skin scraping of a patient. The assembled 33.4 Mb genome encodes 11,015 putative coding DNA sequences, of which, 2.49% are predicted transposable elements. Multilocus phylogenetic and phylogenomic analyses showed B. papendorfii UM 226 clustering with Curvularia species, apart from other plant pathogenic Bipolaris species.…

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Sunday, July 7, 2019

Genome sequence of Pseudomonas parafulva CRS01-1, an antagonistic bacterium isolated from rice field.

Pseudomonas parafulva (formerly known as Pseudomonas fulva) is an antagonistic bacterium against several rice bacterial and fungal diseases. The total genome size of P. parafulva CRS01-1 is 5,087,619bp with 4389 coding sequences (CDSs), 77 tRNAs, and 7 rRNAs. The annotated full genome sequence of the P. parafulva CRS01-1 strain might shed light on its role as an antagonistic bacterium. Copyright © 2015. Published by Elsevier B.V.

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Sunday, July 7, 2019

Whole-genome sequence of Serratia liquefaciens HUMV-21, a cytotoxic, auorum-sensing, and biofilm-producing clinical isolate.

A clinical isolate of Serratia liquefaciens (strain HUMV-21) was obtained from a skin ulcer of an adult patient. We report here its complete genome assembly using PacBio single-molecule real-time (SMRT) sequencing, which resulted in a single circular chromosome with 5.3 Mb. About 5,844 protein-coding genes are predicted from this assembly. Copyright © 2015 Lázaro-Díez et al.

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Sunday, July 7, 2019

Full genome sequence of Brevibacillus laterosporus strain B9, a biological control strain isolated from Zhejiang, China.

Brevibacillus laterosporus was newly classified from Bacillus laterosporus, which has ability to be used as a biological control agent in crop field. B. laterosporus strain B9 is an aerobic, motile, Gram-positive, spore-forming rod that was isolated from a field of Oryza sativa in Zhejiang, China in 2011. This bacterium has been confirmed to be a strong antagonist against bacterial brown strip of rice caused by Acidovorex avenae subsp. avenae. Here we describe the features of B. laterosporus strain B9, together with the complete genome sequence and its annotation. The 5,272,435bp genome contains 4804 protein-coding genes and 227 RNA-only encoding genes…

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Sunday, July 7, 2019

The Streptomyces leeuwenhoekii genome: de novo sequencing and assembly in single contigs of the chromosome, circular plasmid pSLE1 and linear plasmid pSLE2.

Next Generation DNA Sequencing (NGS) and genome mining of actinomycetes and other microorganisms is currently one of the most promising strategies for the discovery of novel bioactive natural products, potentially revealing novel chemistry and enzymology involved in their biosynthesis. This approach also allows rapid insights into the biosynthetic potential of microorganisms isolated from unexploited habitats and ecosystems, which in many cases may prove difficult to culture and manipulate in the laboratory. Streptomyces leeuwenhoekii (formerly Streptomyces sp. strain C34) was isolated from the hyper-arid high-altitude Atacama Desert in Chile and shown to produce novel polyketide antibiotics.Here we present the de novo…

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