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Tuesday, April 21, 2020

Complete genome sequence of Paenisporosarcina antarctica CGMCC 1.6503 T, a marine psychrophilic bacterium isolated from Antarctica

A marine psychrophilic bacterium _Paenisporosarcina antarctica_ CGMCC 1.6503T (= JCM 14646T) was isolated off King George Island, Antarctica (62°13’31? S 58°57’08? W). In this study, we report the complete genome sequence of _Paenisporosarcina antarctica_, which is comprised of 3,972,524?bp with a mean G?+?C content of 37.0%. By gene function and metabolic pathway analyses, studies showed that strain CGMCC 1.6503T encodes a series of genes related to cold adaptation, including encoding fatty acid desaturases, dioxygenases, antifreeze proteins and cold shock proteins, and possesses several two-component regulatory systems, which could assist this strain in responding to the cold stress, the oxygen stress…

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Tuesday, April 21, 2020

Complete genome of Pseudomonas sp. DMSP-1 isolated from the Arctic seawater of Kongsfjorden, Svalbard

The genus Pseudomonas is highly metabolically diverse and has colonized a wide range of ecological niches. The strain Pseudomonas sp. DMSP-1 was isolated from Arctic seawater (Kongsfjorden, Svalbard) using dimethylsulfoniopropionate (DMSP) as the sole carbon source. To better understand its role in the Arctic coastal ecosystem, the genome of Pseudomonas sp. strain DMSP-1 was completely sequenced. The genome contained a circular chromosome of 6,282,445?bp with an average GC content of 60.01?mol%. A total of 5510 protein coding genes, 70 tRNA genes and 19 rRNA genes were obtained. However, no genes encoding known enzymes associated with DMSP catabolism were identified in…

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Tuesday, April 21, 2020

Harnessing long-read amplicon sequencing to uncover NRPS and Type I PKS gene sequence diversity in polar desert soils.

The severity of environmental conditions at Earth’s frigid zones present attractive opportunities for microbial biomining due to their heightened potential as reservoirs for novel secondary metabolites. Arid soil microbiomes within the Antarctic and Arctic circles are remarkably rich in Actinobacteria and Proteobacteria, bacterial phyla known to be prolific producers of natural products. Yet the diversity of secondary metabolite genes within these cold, extreme environments remain largely unknown. Here, we employed amplicon sequencing using PacBio RS II, a third generation long-read platform, to survey over 200 soils spanning twelve east Antarctic and high Arctic sites for natural product-encoding genes, specifically targeting…

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Tuesday, April 21, 2020

Complete genome sequences of a H2O2-resistant psychrophilic bacterium Colwellia sp. Arc7-D isolated from Arctic Ocean sediment

Colwellia sp. Arc7-D, a psychrophilic H2O2-resisitant bacterium, was isolated from Arctic Ocean sediment. Here we describe the complete genome of Colwellia sp. Arc7-D. The genome has one circular chromosome of 4,305,442?bp (37.67?mol%?G?+?C content), consisting of 3526 coding genes, 77 tRNA genes, as well as five rRNA operons as 16S–23S-5S rRNA and one rRNA operon as 16S-23S-5S-5S. According to KEGG analysis, strain Arc7-D encodes 23 genes related with antioxidant activity including superoxide dismutase, glutathione peroxidase, glutathione reductase and catalase. However, many additional genes affiliated with anti-oxidative stress were also identified, such as aconitase, thioredoxin and ascorbic acid.

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Tuesday, April 21, 2020

A New Species of the ?-Proteobacterium Francisella, F. adeliensis Sp. Nov., Endocytobiont in an Antarctic Marine Ciliate and Potential Evolutionary Forerunner of Pathogenic Species.

The study of the draft genome of an Antarctic marine ciliate, Euplotes petzi, revealed foreign sequences of bacterial origin belonging to the ?-proteobacterium Francisella that includes pathogenic and environmental species. TEM and FISH analyses confirmed the presence of a Francisella endocytobiont in E. petzi. This endocytobiont was isolated and found to be a new species, named F. adeliensis sp. nov.. F. adeliensis grows well at wide ranges of temperature, salinity, and carbon dioxide concentrations implying that it may colonize new organisms living in deeply diversified habitats. The F. adeliensis genome includes the igl and pdp gene sets (pdpC and pdpE…

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Tuesday, April 21, 2020

Complete genome sequence of Pseudomonas frederiksbergensis ERDD5:01 revealed genetic bases for survivability at high altitude ecosystem and bioprospection potential.

Pseudomonas frederiksbergensis ERDD5:01 is a psychrotrophic bacteria isolated from the glacial stream flowing from East Rathong glacier in Sikkim Himalaya. The strain showed survivability at high altitude stress conditions like freezing, frequent freeze-thaw cycles, and UV-C radiations. The complete genome of 5,746,824?bp circular chromosome and a plasmid of 371,027?bp was sequenced to understand the genetic basis of its survival strategy. Multiple copies of cold-associated genes encoding cold active chaperons, general stress response, osmotic stress, oxidative stress, membrane/cell wall alteration, carbon storage/starvation and, DNA repair mechanisms supported its survivability at extreme cold and radiations corroborating with the bacterial physiological findings. The…

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Tuesday, April 21, 2020

Genomic Characterization of a Newly Isolated Rhizobacteria Sphingomonas panacis Reveals Plant Growth Promoting Effect to Rice

This article reports the full genome sequence of Sphingomonas panacis DCY99T (=KCTC 42347T =JCM30806T), which is a Gram-negative rod-shaped, non-spore forming, motile bacterium isolated from rusty ginseng root in South Korea. A draft genome of S. panacis DCY99T and a single circular plasmid were generated using the PacBio platform. Antagonistic activity experiment showed S. panacis DCY99T has the plant growth promoting effect. Thus, the genome sequence of S. panacis DCY99T may contribute to biotechnological application of the genus Sphingomonas in agriculture.

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Tuesday, April 21, 2020

The complete genome sequence of the denitrifying bacterium Marinobacter sp. Arc7-DN-1 isolated from Arctic Ocean sediment

The general features and genome characteristics of the denitrifying bacterium Marinobacter sp. Arc7-DN-1, isolated from Arctic Ocean sediment, are described. Marinobacter sp. Arc7-DN-1 uses NO3- or NH4+ as the sole nitrogen source to grow at low temperatures. The strain can grow at a wide range of temperatures (0–30?°C) and NaCl concentration (15–90‰). The genome has one circular chromosome of 4,300,456?bp (57.64?mol%?G?+?C content), consisting of 4012 coding genes, including 50 tRNAs and three rRNA operons as 16S-23S-5S rRNA. On the basis of the KEGG analysis, strain Arc7-DN-1 encodes 43 proteins related to nitrogen metabolism, including a complete denitrifying pathway and an…

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Tuesday, April 21, 2020

Denitrifying Bacteria Active in Woodchip Bioreactors at Low-Temperature Conditions.

Woodchip bioreactor technology removes nitrate from agricultural subsurface drainage by using denitrifying microorganisms. Although woodchip bioreactors have demonstrated success in many field locations, low water temperature can significantly limit bioreactor efficiency and performance. To improve bioreactor performance, it is important to identify the microbes responsible for nitrate removal at low temperature conditions. Therefore, in this study, we identified and characterized denitrifiers active at low-temperature conditions by using culture-independent and -dependent approaches. By comparative 16S rRNA (gene) analysis and culture isolation technique, Pseudomonas spp., Polaromonas spp., and Cellulomonas spp. were identified as being important bacteria responsible for denitrification in woodchip bioreactor…

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