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October 1, 2018

Characterization and genomic analyses of Pseudomonas aeruginosa podovirus TC6: establishment of genus Pa11virus.

Phages have attracted a renewed interest as alternative to chemical antibiotics. Although the number of phages is 10-fold higher than that of bacteria, the number of genomically characterized phages is far less than that of bacteria. In this study, phage TC6, a novel lytic virus of Pseudomonas aeruginosa, was isolated and characterized. TC6 consists of an icosahedral head with a diameter of approximately 54 nm and a short tail with a length of about 17 nm, which are characteristics of the family Podoviridae. TC6 can lyse 86 out of 233 clinically isolated P. aeruginosa strains, thus showing application potentials for…

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September 1, 2018

Complete genome sequence of Cd(II)-resistant Arthrobacter sp. PGP41, a plant growth-promoting bacterium with potential in microbe-assisted phytoremediation.

Microbe-assisted phytoremediation has great potential for practical applications. Plant growth-promoting bacteria (PGPB) with heavy metal (HM) resistance are important for the implementation of PGPB-assisted phytoremediation of HM-contaminated environments. Arthrobacter sp. PGP41 is a Cd(II)-resistant bacterium isolated from the rhizosphere soils of a Cd(II) hyperaccumulator plant, Solanum nigrum. Strain PGP41 can significantly improve plant seedling and root growth under Cd(II) stress conditions. This bacterium exhibited the ability to produce high levels of indole-3-acetic acid (IAA), as well as the ability to fix nitrogen and solubilize phosphate, and it possessed 1-aminocyclopropane-1-carboxylate (ACC) deaminase activity. Here, we present the complete genome sequence of…

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November 1, 2017

Improved PKS gene expression with strong endogenous promoter resulted in geldanamycin yield increase.

The type I polyketide geldanamycin is a potent anti-tumor reagent. Its biosynthesis includes three steps: the biosynthesis of precursors, such as 3-amino-5-hydroxybenzoic acid (AHBA), the polyketide synthase (PKS) chain extension, and the post-PKS modifications. According to the genomic and transcriptomic analysis, the PKS chain extension was deduced to be the rate-limiting step for geldanamycin production in Streptomyces hygroscopicus XM201. In order to improve the expression of PKS genes, a strong endogenous promoter 5063p was obtained based on the transcriptomic analysis and XylE enzymatic assay. By replacing the native PKS promoter gdmA1p with 5063p, the expression of the PKS genes during…

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March 23, 2017

Virulence and genomic feature of a virulent Klebsiella pneumoniae sequence type 14 strain of serotype K2 harboring blaNDM-5 in China.

The objective of this study was to reveal the molecular mechanism involved in carbapenem resistance and virulence of a K2 Klebsiella pneumoniae clinical isolate 24835. The virulence of the strain was determined by in vitro and in vivo methods. The de novo whole-genome sequencing technology and molecular biology methods were used to analyze the genomic features associated with the carbapenem resistance and virulence of K. pneumoniae 24835. Strain 24835 was highly resistant to carbapenems and belonged to ST14, exhibited hypermucoviscous and unique K2-aerobactin-kfu-rmpA positive phenotype. As the only carbapenemase gene in strain 24835, blaNDM-5 was located on a 46-kb IncX3…

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