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Sunday, July 7, 2019

Molecular characterization of plasmid pMoma1of Moraxella macacae, a newly described bacterial pathogen of macaques.

We report the complete nucleotide sequence and characterization of a small cryptic plasmid of Moraxella macacae 0408225, a newly described bacterial species within the family Moraxellaceae and a causative agent of epistaxis in macaques. The complete nucleotide sequence of the plasmid pMoma1 was determined and found to be 5,375 bp in size with a GC content of 37.4 %. Computer analysis of the sequence data revealed five open reading frames encoding putative proteins of 54.4 kDa (ORF1), 17.6 kDa (ORF2), 13.3 kDa (ORF3), 51.6 kDa (ORF4), and 25.0 kDa (ORF5). ORF1, ORF2, and ORF3 encode putative proteins with high identity…

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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

Resources for genetic and genomic analysis of emerging pathogen Acinetobacter baumannii.

Acinetobacter baumannii is a Gram-negative bacterial pathogen notorious for causing serious nosocomial infections that resist antibiotic therapy. Research to identify factors responsible for the pathogen’s success has been limited by the resources available for genome-scale experimental studies. This report describes the development of several such resources for A. baumannii strain AB5075, a recently characterized wound isolate that is multidrug resistant and displays robust virulence in animal models. We report the completion and annotation of the genome sequence, the construction of a comprehensive ordered transposon mutant library, the extension of high-coverage transposon mutant pool sequencing (Tn-seq) to the strain, and the…

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Sunday, July 7, 2019

Common cell shape evolution of two nasopharyngeal pathogens.

Respiratory infectious diseases are the third cause of worldwide death. The nasopharynx is the portal of entry and the ecological niche of many microorganisms, of which some are pathogenic to humans, such as Neisseria meningitidis and Moraxella catarrhalis. These microbes possess several surface structures that interact with the actors of the innate immune system. In our attempt to understand the past evolution of these bacteria and their adaption to the nasopharynx, we first studied differences in cell wall structure, one of the strongest immune-modulators. We were able to show that a modification of peptidoglycan (PG) composition (increased proportion of pentapeptides)…

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Sunday, July 7, 2019

A multidrug resistance plasmid contains the molecular switch for type VI secretion in Acinetobacter baumannii.

Infections with Acinetobacter baumannii, one of the most troublesome and least studied multidrug-resistant superbugs, are increasing at alarming rates. A. baumannii encodes a type VI secretion system (T6SS), an antibacterial apparatus of Gram-negative bacteria used to kill competitors. Expression of the T6SS varies among different strains of A. baumannii, for which the regulatory mechanisms are unknown. Here, we show that several multidrug-resistant strains of A. baumannii harbor a large, self-transmissible resistance plasmid that carries the negative regulators for T6SS. T6SS activity is silenced in plasmid-containing, antibiotic-resistant cells, while part of the population undergoes frequent plasmid loss and activation of the…

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Sunday, July 7, 2019

Complete genome sequence of Acinetobacter baumannii strain B8300, which displays high twitching motility.

Acinetobacter baumannii has emerged as an important nosocomial pathogen causing health care-associated infections. In this study, we determined the genome of a twitching-positive clinical strain, B8300, isolated from a hospital in southern India. De novo assembly of PacBio long-read sequencing data generated the B8300 genome that consists of a chromosome of 3.82 Mbp and a plasmid of 25.15 kbp. Copyright © 2015 Vijaykumar et al.

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Sunday, July 7, 2019

Complete genome sequence of Acinetobacter baumannii strain B8342, a motility-positive clinical isolate.

Acinetobacter baumannii is an emerging Gram-negative pathogen responsible for health care-associated infections. In this study, we determined the genome of a motility-positive clinical strain, B8342, isolated from a hospital in southern India. The B8342 genome, which is 3.94 Mbp, was generated by de novo assembly of PacBio long-read sequencing data. Copyright © 2015 Vijaykumar et al.

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Sunday, July 7, 2019

Genome sequence analysis of the naphthenic acid degrading and metal resistant bacterium Cupriavidus gilardii CR3.

Cupriavidus sp. are generally heavy metal tolerant bacteria with the ability to degrade a variety of aromatic hydrocarbon compounds, although the degradation pathways and substrate versatilities remain largely unknown. Here we studied the bacterium Cupriavidus gilardii strain CR3, which was isolated from a natural asphalt deposit, and which was shown to utilize naphthenic acids as a sole carbon source. Genome sequencing of C. gilardii CR3 was carried out to elucidate possible mechanisms for the naphthenic acid biodegradation. The genome of C. gilardii CR3 was composed of two circular chromosomes chr1 and chr2 of respectively 3,539,530 bp and 2,039,213 bp in…

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Sunday, July 7, 2019

Genome sequences of two multidrug-resistant Acinetobacter baumannii clinical strains isolated from Southern India

Acinetobacter baumannii is an emerging nosocomial pathogen causing infections worldwide. In this study, we determined the genome sequences of two multidrug-resistant A. baumannii clinical strains isolated from a hospital in southern India. Genome analyses indicate that both the strains harbor numerous horizontally transferred genetic elements and antibiotic resistance cassettes. Copyright © 2015 Balaji et al.

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Sunday, July 7, 2019

Draft genome sequence of a nitrate-reducing, o-phthalate degrading bacterium, Azoarcus sp. strain PA01(T).

Azoarcus sp. strain PA01(T) belongs to the genus Azoarcus, of the family Rhodocyclaceae within the class Betaproteobacteria. It is a facultatively anaerobic, mesophilic, non-motile, Gram-stain negative, non-spore-forming, short rod-shaped bacterium that was isolated from a wastewater treatment plant in Constance, Germany. It is of interest because of its ability to degrade o-phthalate and a wide variety of aromatic compounds with nitrate as an electron acceptor. Elucidation of the o-phthalate degradation pathway may help to improve the treatment of phthalate-containing wastes in the future. Here, we describe the features of this organism, together with the draft genome sequence information and annotation.…

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Sunday, July 7, 2019

Metabolomics-driven discovery of a prenylated isatin antibiotic produced by Streptomyces species MBT28.

Actinomycetes are a major source of antimicrobials, anticancer compounds, and other medically important products, and their genomes harbor extensive biosynthetic potential. Major challenges in the screening of these microorganisms are to activate the expression of cryptic biosynthetic gene clusters and the development of technologies for efficient dereplication of known molecules. Here we report the identification of a previously unidentified isatin-type antibiotic produced by Streptomyces sp. MBT28, following a strategy based on NMR-based metabolomics combined with the introduction of streptomycin resistance in the producer strain. NMR-guided isolation by tracking the target proton signal resulted in the characterization of 7-prenylisatin (1) with…

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Sunday, July 7, 2019

Twenty years of bacterial genome sequencing.

Twenty years ago, the publication of the first bacterial genome sequence, from Haemophilus influenzae, shook the world of bacteriology. In this Timeline, we review the first two decades of bacterial genome sequencing, which have been marked by three revolutions: whole-genome shotgun sequencing, high-throughput sequencing and single-molecule long-read sequencing. We summarize the social history of sequencing and its impact on our understanding of the biology, diversity and evolution of bacteria, while also highlighting spin-offs and translational impact in the clinic. We look forward to a ‘sequencing singularity’, where sequencing becomes the method of choice for as-yet unthinkable applications in bacteriology and…

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Sunday, July 7, 2019

Molecular epidemiology of multidrug-resistant Acinetobacter baumannii isolates in a university hospital in Nepal reveals the emergence of a novel epidemic clonal lineage.

The emergence of multidrug-resistant (MDR) Acinetobacter baumannii has become a serious medical problem worldwide. To clarify the genetic and epidemiological properties of MDR A. baumannii strains isolated from a medical setting in Nepal, 246 Acinetobacter spp. isolates obtained from different patients were screened for MDR A. baumannii by antimicrobial disk susceptibility testing. Whole genomes of the MDR A. baumannii isolates were sequenced by MiSeq™ (Illumina), and the complete genome of one isolate (IOMTU433) was sequenced by PacBio RS II. Phylogenetic trees were constructed from single nucleotide polymorphism concatemers. Multilocus sequence types were deduced and drug resistance genes were identified. Of…

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Sunday, July 7, 2019

Genome sequence and description of the anaerobic lignin-degrading bacterium Tolumonas lignolytica sp. nov.

Tolumonas lignolytica BRL6-1(T) sp. nov. is the type strain of T. lignolytica sp. nov., a proposed novel species of the Tolumonas genus. This strain was isolated from tropical rainforest soils based on its ability to utilize lignin as a sole carbon source. Cells of Tolumonas lignolytica BRL6-1(T) are mesophilic, non-spore forming, Gram-negative rods that are oxidase and catalase negative. The genome for this isolate was sequenced and returned in seven unique contigs totaling 3.6Mbp, enabling the characterization of several putative pathways for lignin breakdown. Particularly, we found an extracellular peroxidase involved in lignin depolymerization, as well as several enzymes involved…

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