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Friday, July 19, 2019

Complete genome sequences of extremely thermoacidophilic metal-mobilizing type strain members of the archaeal family Sulfolobaceae, Acidianus brierleyi DSM-1651, Acidianus sulfidivorans DSM-18786, and Metallosphaera hakonensis DSM-7519.

The family Sulfolobaceae contains extremely thermoacidophilic archaea that are found in terrestrial environments. Here, we report three closed genomes from two currently defined genera within the family, namely, Acidianus brierleyi DSM-1651T, Acidianus sulfidivorans DSM-18786T, and Metallosphaera hakonensis DSM-7519T.

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Friday, July 19, 2019

Deep genome annotation of the opportunistic human pathogen Streptococcus pneumoniae D39.

A precise understanding of the genomic organization into transcriptional units and their regulation is essential for our comprehension of opportunistic human pathogens and how they cause disease. Using single-molecule real-time (PacBio) sequencing we unambiguously determined the genome sequence of Streptococcus pneumoniae strain D39 and revealed several inversions previously undetected by short-read sequencing. Significantly, a chromosomal inversion results in antigenic variation of PhtD, an important surface-exposed virulence factor. We generated a new genome annotation using automated tools, followed by manual curation, reflecting the current knowledge in the field. By combining sequence-driven terminator prediction, deep paired-end transcriptome sequencing and enrichment of primary…

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Sunday, July 7, 2019

Complete genome sequence of Enterobacter cloacae GGT036: a furfural tolerant soil bacterium.

Enterobacter cloacae is a facultative anaerobic bacterium to be an important cause of nosocomial infection. However, the isolated E. cloacae GGT036 showed higher furfural-tolerant cellular growth, compared to industrial relevant strains such as Escherichia coli and Corynebacterium glutamicum. Here, we report the complete genome sequence of E. cloacae GGT036 isolated from Mt. Gwanak, Seoul, Republic of Korea. The genomic DNA sequence of E. cloacae GGT036 will provide valuable genetic resources for engineering of industrially relevant strains being tolerant to cellular inhibitors present in lignocellulosic hydrolysates. Copyright © 2014 Elsevier B.V. All rights reserved.

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Sunday, July 7, 2019

Burkholderia pseudomallei sequencing identifies genomic clades with distinct recombination, accessory, and epigenetic profiles.

Burkholderia pseudomallei (Bp) is the causative agent of the infectious disease melioidosis. To investigate population diversity, recombination, and horizontal gene transfer in closely related Bp isolates, we performed whole-genome sequencing (WGS) on 106 clinical, animal, and environmental strains from a restricted Asian locale. Whole-genome phylogenies resolved multiple genomic clades of Bp, largely congruent with multilocus sequence typing (MLST). We discovered widespread recombination in the Bp core genome, involving hundreds of regions associated with multiple haplotypes. Highly recombinant regions exhibited functional enrichments that may contribute to virulence. We observed clade-specific patterns of recombination and accessory gene exchange, and provide evidence that…

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Sunday, July 7, 2019

Complete genome sequence of the fish pathogen Flavobacterium psychrophilum ATCC 49418(T.).

Flavobacterium psychrophilum is the causative agent of bacterial cold water disease and rainbow trout fry mortality syndrome in salmonid fishes and is associated with significant losses in the aquaculture industry. The virulence factors and molecular mechanisms of pathogenesis of F. psychrophilum are poorly understood. Moreover, at the present time, there are no effective vaccines and control using antimicrobial agents is problematic due to growing antimicrobial resistance and the fact that sick fish don’t eat. In the hopes of identifying vaccine and therapeutic targets, we sequenced the genome of the type strain ATCC 49418 which was isolated from the kidney of…

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Sunday, July 7, 2019

Development of an orthogonal fatty acid biosynthesis system in E. coli for oleochemical production.

Here we report recombinant expression and activity of several type I fatty acid synthases that can function in parallel with the native Escherichia coli fatty acid synthase. Corynebacterium glutamicum FAS1A was the most active in E. coli and this fatty acid synthase was leveraged to produce oleochemicals including fatty alcohols and methyl ketones. Coexpression of FAS1A with the ACP/CoA-reductase Maqu2220 from Marinobacter aquaeolei shifted the chain length distribution of fatty alcohols produced. Coexpression of FAS1A with FadM, FadB, and an acyl-CoA-oxidase from Micrococcus luteus resulted in the production of methyl ketones, although at a lower level than cells using the…

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Sunday, July 7, 2019

Sequence type 1 group B Streptococcus, an emerging cause of invasive disease in adults, evolves by small genetic changes.

The molecular mechanisms underlying pathogen emergence in humans is a critical but poorly understood area of microbiologic investigation. Serotype V group B Streptococcus (GBS) was first isolated from humans in 1975, and rates of invasive serotype V GBS disease significantly increased starting in the early 1990s. We found that 210 of 229 serotype V GBS strains (92%) isolated from the bloodstream of nonpregnant adults in the United States and Canada between 1992 and 2013 were multilocus sequence type (ST) 1. Elucidation of the complete genome of a 1992 ST-1 strain revealed that this strain had the highest homology with a…

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Sunday, July 7, 2019

Complete genome of the potential thermozyme producer Anoxybacillus gonensis G2(T) isolated from the Gönen hot springs in Turkey.

Anoxybacillus gonensis type strain G2(T) (=NCIMB 13,933(T) =NCCB 100040(T)) has been isolated from the Gönen hot springs in Turkey. This strain produces a number of well-studied, biotechnologically important enzymes, including xylose isomerase, carboxylesterase, and fructose-1,6-bisphosphate aldolase. In addition, this strain is an excellent candidate for the bioremediation of areas with heavy metal pollution. Here, we present a high-quality, annotated, complete genome of A. gonensis G2(T). Furthermore, this report provides insights into several novel enzymes of strain G2(T) and their potential industrial applications. Copyright © 2015 Elsevier B.V. All rights reserved.

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Sunday, July 7, 2019

Mutation assay using single-molecule real-time (SMRT) sequencing technology

Introduction We present here a simple, phenotype-independent mutation assay using a PacBio RSII DNA sequencer employing single-molecule real-time (SMRT) sequencing technology. Salmonella typhimurium YG7108 was treated with the alkylating agent N-ethyl-N-nitrosourea (ENU) and grown though several generations to fix the induced mutations, the DNA was extracted and the mutations were analyzed by using the SMRT DNA sequencer. Results The ENU-induced base-substitution frequency was 15.4 per Megabase pair, which is highly consistent with our previous results based on colony isolation and next-generation sequencing. The induced mutation spectrum (95% G:C???A:T, 5% A:T???G:C) is also consistent with the known ENU signature. The base-substitution…

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Sunday, July 7, 2019

Luteipulveratus halotolerans sp. nov., a novel actinobacterium (Dermacoccaceae) from Sarawak, Malaysia.

The taxonomic position of an actinobacterium strain, C296001T, isolated from a soil sample collected in Sarawak, Malaysia, was established using a polyphasic approach. Phylogenetically, strain C296001T is closely associated with the genus Luteipulveratus that forms a distinct monophyletic clade with the only described species, L. mongoliensis NBRC 105296T. The 16S rRNA gene sequence similarity between strain C296001T and L. mongoliensis is 98.7%. DNA-DNA hybridization results showed that the relatedness of strain C296001T to L. mongoliensis was only 21.5%. The G+C content of strain C296001T DNA is 71.7 mol%. Using a PacBio RS II system whole genome sequences for strains C296001T…

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Sunday, July 7, 2019

Complete genome sequences of 11 Bordetella pertussis strains representing the pandemic ptxP3 lineage.

Pathogen adaptation has contributed to the resurgence of pertussis. To facilitate our understanding of this adaptation we report here 11 completely closed and annotated Bordetella pertussis genomes representing the pandemic ptxP3 lineage. Our analyses included six strains which do not produce the vaccine components pertactin and/or filamentous hemagglutinin. Copyright © 2015 Bart et al.

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Sunday, July 7, 2019

Global insights into acetic acid resistance mechanisms and genetic stability of Acetobacter pasteurianus strains by comparative genomics.

Acetobacter pasteurianus (Ap) CICC 20001 and CGMCC 1.41 are two acetic acid bacteria strains that, because of their strong abilities to produce and tolerate high concentrations of acetic acid, have been widely used to brew vinegar in China. To globally understand the fermentation characteristics, acid-tolerant mechanisms and genetic stabilities, their genomes were sequenced. Genomic comparisons with 9 other sequenced Ap strains revealed that their chromosomes were evolutionarily conserved, whereas the plasmids were unique compared with other Ap strains. Analysis of the acid-tolerant metabolic pathway at the genomic level indicated that the metabolism of some amino acids and the known mechanisms…

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