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Friday, July 19, 2019

Genome-directed lead discovery: biosynthesis, structure elucidation, and biological evaluation of two families of polyene macrolactams against Trypanosoma brucei.

Marine natural products are an important source of lead compounds against many pathogenic targets. Herein, we report the discovery of lobosamides A-C from a marine actinobacterium, Micromonospora sp., representing three new members of a small but growing family of bacterially produced polyene macrolactams. The lobosamides display growth inhibitory activity against the protozoan parasite Trypanosoma brucei (lobosamide A IC50 = 0.8 µM), the causative agent of human African trypanosomiasis (HAT). The biosynthetic gene cluster of the lobosamides was sequenced and suggests a conserved cluster organization among the 26-membered macrolactams. While determination of the relative and absolute configurations of many members of…

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Friday, July 19, 2019

Variable genetic architectures produce virtually identical molecules in bacterial symbionts of fungus-growing ants.

Small molecules produced by Actinobacteria have played a prominent role in both drug discovery and organic chemistry. As part of a larger study of the actinobacterial symbionts of fungus-growing ants, we discovered a small family of three previously unreported piperazic acid-containing cyclic depsipeptides, gerumycins A-C. The gerumycins are slightly smaller versions of dentigerumycin, a cyclic depsipeptide that selectively inhibits a common fungal pathogen, Escovopsis. We had previously identified this molecule from a Pseudonocardia associated with Apterostigma dentigerum, and now we report the molecule from an associate of the more highly derived ant Trachymyrmex cornetzi. The three previously unidentified compounds, gerumycins…

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Friday, July 19, 2019

Complete genome sequence of Tessaracoccus sp. strain T2.5-30 isolated from 139.5 meters deep on the subsurface of the Iberian Pyritic Belt.

Here, we report the complete genome sequence of Tessaracoccus sp. strain T2.5-30, which consists of a chromosome with 3.2 Mbp, 70.4% G+C content, and 3,005 coding DNA sequences. The strain was isolated from a rock core retrieved at a depth of 139.5 m in the subsurface of the Iberian Pyritic Belt (Spain). Copyright © 2017 Leandro et al.

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Friday, July 19, 2019

De novo assembly of genomes from long sequence reads reveals uncharted territories of Propionibacterium freudenreichii.

Propionibacterium freudenreichii is an industrially important bacterium granted the Generally Recognized as Safe (the GRAS) status, due to its long safe use in food bioprocesses. Despite the recognized role in the food industry and in the production of vitamin B12, as well as its documented health-promoting potential, P. freudenreichii remained poorly characterised at the genomic level. At present, only three complete genome sequences are available for the species.We used the PacBio RS II sequencing platform to generate complete genomes of 20 P. freudenreichii strains and compared them in detail. Comparative analyses revealed both sequence conservation and genome organisational diversity among…

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Sunday, July 7, 2019

Genomics of methylotrophy in gram-positive methylamine-utilizing bacteria

Gram-positive methylotrophic bacteria have been known for a long period of time, some serving as model organisms for characterizing the specific details of methylotrophy pathways/enzymes within this group. However, genome-based knowledge of methylotrophy within this group has been so far limited to a single species, Bacillus methanolicus (Firmicutes). The paucity of whole-genome data for Gram-positive methylotrophs limits our global understanding of methylotrophy within this group, including their roles in specific biogeochemical cycles, as well as their biotechnological potential. Here, we describe the isolation of seven novel strains of Gram-positive methylotrophs that include two strains of Bacillus and five representatives of…

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Sunday, July 7, 2019

Complete genome sequencing of protease-producing novel Arthrobacter sp. strain IHBB 11108 using PacBio Single-Molecule Real-Time Sequencing technology.

A previously uncharacterized species of the genus Arthrobacter, strain IHBB 11108 (MCC 2780), is a Gram-positive, strictly aerobic, nonmotile, cold-adapted, and protease-producing alkaliphilic actinobacterium, isolated from shallow undersurface water from Chandra Tal Lake, Lahaul-Spiti, India. The complete genome of the strain is 3.6 Mb in size with an average 58.97% G+C content.

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Sunday, July 7, 2019

High-quality draft genome sequence of actinobacterium Kibdelosporangium sp. MJ126-NF4, producer of type II polyketide azicemicins, using Illumina and PacBio Technologies.

Here, we report the high-quality draft genome sequence of actinobacterium Kibdelosporangium sp. MJ126-NF4, producer of the type II polyketide azicemicins, obtained using Illumina and PacBio sequencing technologies. The 11.75-Mbp genome contains >11,000 genes and 22 polyketide and nonribosomal peptide natural product gene clusters. Copyright © 2015 Ogasawara et al.

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Sunday, July 7, 2019

Draft genome sequence of Streptacidiphilus oryzae TH49T, an acidophilic actinobacterium isolated from soil.

The draft genome sequence of Streptacidiphilus oryzae strain TH49(T), an acidophilic actinobacterium, was obtained. The draft is composed of six scaffolds totaling 7.8 Mbp, and it contains 6,829 protein-coding genes and 91 RNA genes. Genes related to respiratory nitrate reduction, siderophore production, and biosynthesis of other secondary metabolites were identified. Copyright © 2015 Kim et al.

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Sunday, July 7, 2019

Complete genome sequence of the cellulase-producing bacterium Clavibacter michiganensis PF008.

The Gram-positive Actinobacterium Clavibacter michiganensis strain PF008 produces a cellulase of biotechnological interest, which is used for degradation of cellulose, a major component of plant cell walls. Here we report the complete genome sequence of this bacterium for better understanding of cellulase production and its virulence mechanism. Copyright © 2015 Elsevier B.V. All rights reserved.

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Sunday, July 7, 2019

Complete genome sequence of Kocuria palustris MU14/1.

Presented here is the first completely assembled genome sequence of Kocuria palustris, an actinobacterial species with broad ecological distribution. The single, circular chromosome of K. palustris MU14/1 comprises 2,854,447 bp, has a G+C content of 70.5%, and contains a deduced gene set of 2,521 coding sequences. Copyright © 2015 Calcutt and Foecking.

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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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