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Tuesday, April 21, 2020

Chryseobacterium mulctrae sp. nov., isolated from raw cow’s milk.

A Gram-stain-negative bacterial strain, designated CA10T, was isolated from bovine raw milk sampled in Anseong, Republic of Korea. Cells were yellow-pigmented, aerobic, non-motile bacilli and grew optimally at 30?°C and pH 7.0 on tryptic soy agar without supplementation of NaCl. Phylogenetic analysis based on the 16S rRNA gene sequences revealed that strain CA10T belonged to the genus Chryseobacterium, family Flavobacteriaceae, and was most closely related to Chryseobacterium indoltheticum ATCC 27950T (98.75?% similarity). The average nucleotide identity and digital DNA-DNA hybridization values of strain CA10T were 94.4 and 56.9?%, respectively, relative to Chryseobacterium scophthalmum DSM 16779T, being lower than the cut-off…

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Tuesday, April 21, 2020

Mediterraneibacter butyricigenes sp. nov., a butyrate-producing bacterium isolated from human faeces.

A Gram-stain-positive, obligately anaerobic, non-motile, nonspore-forming, and rod-shaped bacterial strain, designated KGMB01110T, was isolated from a faecal sample of a healthy male in South Korea. Phylogenetic analysis based on 16S rRNA gene showed that strain KGMB01110T belonged to Clostridium cluster XIVa and was most closely related to Mediterraneibacter glycyrrhizinilyticus KCTC 5760T (95.9% 16S rRNA gene sequence similarity). The DNA G + C content of strain KGMB01110T based on its whole genome sequence was 44.1 mol%. The major cellular fatty acids (> 10%) of the isolate were C14:0 and C16:0. The strain KGMB01110T was positive for arginine dihydrolase, ß-galactosidase-6-phosphatase, and alkaline…

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Tuesday, April 21, 2020

Intestinibaculum porci gen. nov., sp. nov., a new member of the family Erysipelotrichaceae isolated from the small intestine of a swine.

A strictly anaerobic, Gram-stain-positive, catalase-negative, non-motile, rod-shaped bacterium, designated SG0102T, was isolated from the small intestine of a swine. Optimal growth occurred at 37°C and pH 7.0. Furthermore, growth was observed in the presence of up to 3% (w/v) NaCl but not at salinity levels higher than 4%. The comparative analysis of 16S rRNA gene sequences showed that strain SG0102T was most closely related to Kandleria vitulina DSM 20405T (93.3%), followed by Catenibacterium mitsuokai KCTC 5053T (91.1%), Sharpea azabuensis KCTC 15217T (91.0%), and Eggerthia catenaformis DSM 5348T (89.6%). The average nucleotide identity values between strain SG0102T and related species, K.…

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Tuesday, April 21, 2020

Comparative genomic analysis of Lactobacillus mucosae LM1 identifies potential niche-specific genes and pathways for gastrointestinal adaptation.

Lactobacillus mucosae is currently of interest as putative probiotics due to their metabolic capabilities and ability to colonize host mucosal niches. L. mucosae LM1 has been studied in its functions in cell adhesion and pathogen inhibition, etc. It demonstrated unique abilities to use energy from carbohydrate and non-carbohydrate sources. Due to these functions, we report the first complete genome sequence of an L. mucosae strain, L. mucosae LM1. Analysis of the pan-genome in comparison with closely-related Lactobacillus species identified a complete glycogen metabolism pathway, as well as folate biosynthesis, complementing previous proteomic data on the LM1 strain. It also revealed…

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Tuesday, April 21, 2020

Virulence characteristics and an action mode of antibiotic resistance in multidrug-resistant Pseudomonas aeruginosa.

Pseudomonas aeruginosa displays intrinsic resistance to many antibiotics and known to acquire actively genetic mutations for further resistance. In this study, we attempted to understand genomic and transcriptomic landscapes of P. aeruginosa clinical isolates that are highly resistant to multiple antibiotics. We also aimed to reveal a mode of antibiotic resistance by elucidating transcriptional response of genes conferring antibiotic resistance. To this end, we sequenced the whole genomes and profiled genome-wide RNA transcripts of three different multi-drug resistant (MDR) clinical isolates that are phylogenetically distant from one another. Multi-layered genome comparisons with genomes of antibiotic-susceptible P. aeruginosa strains and 70…

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Sunday, September 22, 2019

Genomic insights into the non-histamine production and proteolytic and lipolytic activities of Tetragenococcus halophilus KUD23.

Tetragenococcus halophilus KUD23, a non-histamine producer, was isolated from a traditional Korean high-salt fermented soybean paste, doenjang. The strain was safe in terms of antibiotic susceptibility, hemolytic activity and biofilm formation. It could grow on De Man-Rogosa-Sharpe agar containing 21% (w/v) NaCl, exhibited acid production at 15% NaCl, and had strain-specific proteolytic and lipolytic activities under salt stress. Complete genome analysis of T. halophilus KUD23 and comparative genomic analysis shed light on the genetic background behind these phenotypic characteristics, including non-production of histamine and proteolytic and lipolytic activities.© FEMS 2017. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

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Sunday, September 22, 2019

Probiotic and anti-inflammatory potential of Lactobacillus rhamnosus 4B15 and Lactobacillus gasseri 4M13 isolated from infant feces.

A total of 22 Lactobacillus strains, which were isolated from infant feces were evaluated for their probiotic potential along with resistance to low pH and bile salts. Eight isolates (L. reuteri 3M02 and 3M03, L. gasseri 4M13, 4R22, 5R01, 5R02, and 5R13, and L. rhamnosus 4B15) with high tolerance to acid and bile salts, and ability to adhere to the intestine were screened from 22 strains. Further, functional properties of 8 Lactobacillus strains, such as anti-oxidation, inhibition of a-glucosidase activity, cholesterol-lowering, and anti-inflammation were evaluated. The properties were strain-specific. Particularly, two strains of L. rhamnosus, 4B15 (4B15) and L. gasseri…

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Sunday, September 22, 2019

Capnocytophaga endodontalis sp. nov., isolated from a human refractory periapical abscess.

A novel Gram-negative, capnophilic, fusiform bacterium, designated strain ChDC OS43T, was isolated from a human refractory periapical abscess in the left mandibular second molar and was characterized by polyphasic taxonomic analysis. The 16S rRNA gene sequence revealed that the strain belongs to the genus Capnocytophaga, as it showed sequence similarities to Capnocytophaga ochracea ATCC 27872T(96.30%) and C. sputigena ATCC 33612T(96.16%). The prevalent fatty acids of strain ChDC OS43Twere isoC15:0(57.54%), C16:0(5.93%), C16:03OH (5.72%), and C18:1cis 9 (4.41%). The complete genome of strain ChDC OS43Twas 3,412,686 bp, and the G+C content was 38.2 mol%. The average nucleotide identity (ANI) value between strain ChDC OS43Tand…

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Sunday, September 22, 2019

Potential survival and pathogenesis of a novel strain, Vibrio parahaemolyticus FORC_022, isolated from a soy sauce marinated crab by genome and transcriptome analyses.

Vibrio parahaemolyticus can cause gastrointestinal illness through consumption of seafood. Despite frequent food-borne outbreaks of V. parahaemolyticus, only 19 strains have subjected to complete whole-genome analysis. In this study, a novel strain of V. parahaemolyticus, designated FORC_022 (Food-borne pathogen Omics Research Center_022), was isolated from soy sauce marinated crabs, and its genome and transcriptome were analyzed to elucidate the pathogenic mechanisms. FORC_022 did not include major virulence factors of thermostable direct hemolysin (tdh) and TDH-related hemolysin (trh). However, FORC_022 showed high cytotoxicity and had several V. parahaemolyticus islands (VPaIs) and other virulence factors, such as various secretion systems (types I,…

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Sunday, September 22, 2019

Coculture of marine Streptomyces sp. with Bacillus sp. produces a newpiperazic acid-bearing cyclic peptide.

Microbial culture conditions in the laboratory, which conventionally involve the cultivation of one strain in one culture vessel, are vastly different from natural microbial environments. Even though perfectly mimicking natural microbial interactions is virtually impossible, the cocultivation of multiple microbial strains is a reasonable strategy to induce the production of secondary metabolites, which enables the discovery of new bioactive natural products. Our coculture of marine Streptomyces and Bacillus strains isolated together from an intertidal mudflat led to discover a new metabolite, dentigerumycin E (1). Dentigerumycin E was determined to be a new cyclic hexapeptide incorporating three piperazic acids, N-OH-Thr, N-OH-Gly,…

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Sunday, July 7, 2019

Genome sequence of the haloarchaeon Haloterrigena jeotgali type strain A29(T) isolated from salt-fermented food.

Haloterrigena jeotgali is a halophilic archaeon within the family Natrialbaceae that was isolated from shrimp jeotgal, a traditional Korean salt-fermented food. A29(T) is the type strain of H. jeotgali, and is a Gram-negative staining, non-motile, rod-shaped archaeon that grows in 10 %-30 % (w/v) NaCl. We present the annotated H. jeotgali A29(T) genome sequence along with a summary of its features. The 4,131,621 bp genome with a GC content of 64.9 % comprises 4,215 protein-coding genes and 127 RNA genes. The sequence can provide useful information on genetic mechanisms that enable haloarchaea to endure a hypersaline environment.

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Sunday, July 7, 2019

Complete genome sequence of Novosphingobium pentaromativorans US6-1(T).

Novosphingobium pentaromativorans US6-1(T) is a species in the family Sphingomonadaceae. According to the phylogenetic analysis based on 16S rRNA gene sequence of the N. pentaromativorans US6-1(T) and nine genome-sequenced strains in the genus Novosphingobium, the similarity ranged from 93.9 to 99.9 % and the highest similarity was found with Novosphingobium sp. PP1Y (99.9 %), whereas the ANI value based on genomes ranged from 70.9 to 93 % and the highest value was 93 %. This microorganism was isolated from muddy coastal bay sediments where the environment is heavily polluted by polycyclic aromatic hydrocarbons (PAHs). It was previously shown to be capable of degrading multiple…

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