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Wednesday, February 26, 2020

Comparison of sequencing approaches applied to complex soil metagenomes to resolve proteins of interest

Background: Long-read sequencing presents several potential advantages for providing more complete gene profiling of metagenomic samples. Long reads can capture multiple genes in a single read, and longer reads typically result in assemblies with better contiguity, especially for higher abundance organisms. However, a major challenge with using long reads has been the higher cost per base, which may lead to insufficient coverage of low-abundance species. Additionally, lower single-pass accuracy can make gene discovery for low-abundance organisms difficult. Methods: To evaluate the pros and cons of long reads for metagenomics, we directly compared PacBio and Illumina sequencing on a soil-derived sample,…

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Sunday, September 22, 2019

Complete genome sequence of Paenibacillus polymyxa YC0136, a plant growth–promoting rhizobacterium isolated from tobacco rhizosphere.

Paenibacillus polymyxa strain YC0136 is a plant growth-promoting rhizobacterium with antimicrobial activity, which was isolated from tobacco rhizosphere. Here, we report the complete genome sequence of P. polymyxa YC0136. Several genes with antifungal and antibacterial activity were discovered. Copyright © 2017 Liu et al.

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Sunday, September 22, 2019

Long-read, Single Molecule, Real-Time (SMRT) DNA Sequencing for metagenomic applications

In this chapter, we describe applications of single molecule, real-time (SMRT) DNA sequencing toward metagenomic research. The long sequence reads, combined with a lack of bias with respect to DNA sequence context or GC content, facilitate a more comprehensive analysis of the genomic constitution of microbial communities. Full-length 16S RNA gene sequencing at high (>99%) accuracy allows for species-level characterization of community members concomitant with the determination of community structure. The application of SMRT sequencing to whole-community shotgun microbial metagenomics has also been discussed.

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Sunday, September 22, 2019

Soil microbial communities are shaped by plant-driven changes in resource availability during secondary succession.

Although we understand the ecological processes eliciting changes in plant community composition during secondary succession, we do not understand whether co-occurring changes in plant detritus shape saprotrophic microbial communities in soil. In this study, we investigated soil microbial composition and function across an old-field chronosequence ranging from 16 to 86 years following agricultural abandonment, as well as three forests representing potential late-successional ecosystems. Fungal and bacterial community composition was quantified from ribosomal DNA, and insight into the functional potential of the microbial community to decay plant litter was gained from shotgun metagenomics and extracellular enzyme assays. Accumulation of soil organic…

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Sunday, September 22, 2019

Atmospheric N deposition increases bacterial laccase-like multicopper oxidases: implications for organic matter decay.

Anthropogenic release of biologically available nitrogen (N) has increased dramatically over the last 150 years, which can alter the processes controlling carbon (C) storage in terrestrial ecosystems. In a northern hardwood forest ecosystem located in Michigan in the United States, nearly 20 years of experimentally increased atmospheric N deposition has reduced forest floor decay and increased soil C storage. This change occurred concomitantly with compositional changes in Basidiomycete fungi and in Actinobacteria, as well as the downregulation of fungal lignocelluloytic genes. Recently, laccase-like multicopper oxidases (LMCOs) have been discovered among bacteria which can oxidize ß-O-4 linkages in phenolic compounds (e.g.,…

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Sunday, September 22, 2019

Soil bacterial communities are shaped by temporal and environmental filtering: evidence from a long-term chronosequence.

Soil microbial communities are abundant, hyper-diverse and mediate global biogeochemical cycles, but we do not yet understand the processes mediating their assembly. Current hypothetical frameworks suggest temporal (e.g. dispersal limitation) and environmental (e.g. soil pH) filters shape microbial community composition; however, there is limited empirical evidence supporting this framework in the hyper-diverse soil environment, particularly at large spatial (i.e. regional to continental) and temporal (i.e. 100 to 1000 years) scales. Here, we present evidence from a long-term chronosequence (4000 years) that temporal and environmental filters do indeed shape soil bacterial community composition. Furthermore, nearly 20 years of environmental monitoring allowed…

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Sunday, September 22, 2019

Genome sequence determination and metagenomic characterization of a Dehalococcoides mixed culture grown on cis-1,2-dichloroethene.

A Dehalococcoides-containing bacterial consortium that performed dechlorination of 0.20 mM cis-1,2-dichloroethene to ethene in 14 days was obtained from the sediment mud of the lotus field. To obtain detailed information of the consortium, the metagenome was analyzed using the short-read next-generation sequencer SOLiD 3. Matching the obtained sequence tags with the reference genome sequences indicated that the Dehalococcoides sp. in the consortium was highly homologous to Dehalococcoides mccartyi CBDB1 and BAV1. Sequence comparison with the reference sequence constructed from 16S rRNA gene sequences in a public database showed the presence of Sedimentibacter, Sulfurospirillum, Clostridium, Desulfovibrio, Parabacteroides, Alistipes, Eubacterium, Peptostreptococcus and Proteocatella…

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Sunday, July 7, 2019

Finished genome sequence of Collimonas arenae Cal35.

We announce the finished genome sequence of soil forest isolate Collimonas arenae Cal35, which comprises a 5.6-Mbp chromosome and 41-kb plasmid. The Cal35 genome is the second one published for the bacterial genus Collimonas and represents the first opportunity for high-resolution comparison of genome content and synteny among collimonads. Copyright © 2015 Wu et al.

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Sunday, July 7, 2019

Complete genome sequence of Paenibacillus polymyxa strain Sb3-1, a soilborne bacterium with antagonistic activity toward plant pathogens.

The genome of Paenibacillus polymyxa Sb3-1, a strain that shows antagonistic activities against pathogenic fungi and bacteria, consists of one 5.6-Mb circular chromosome and two plasmids of 223 kb and 8 kb. The genome reveals several genes that potentially contribute to its antagonistic and plant growth promotion activity. Copyright © 2015 Rybakova et al.

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Sunday, July 7, 2019

Genome sequence of Kosakonia radicincitans strain YD4, a plant growth-promoting rhizobacterium isolated from yerba mate (Ilex paraguariensis St. Hill.).

Kosakonia radicincitans strain YD4 is a rhizospheric isolate from yerba mate (Ilex paraguariensis St. Hill.) with plant growth-promoting effects on this crop. Genes involved in different plant growth-promoting activities are present in this genome, suggesting its potential as a bioinoculant for yerba mate. Copyright © 2015 Bergottini et al.

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Sunday, July 7, 2019

Complete genome sequence of oxalate-degrading bacterium Pandoraea vervacti DSM 23571(T).

Pandoraea vervacti DSM 23571(T) is an oxalate metabolizing bacterium isolated from an uncultivated field soil in Mugla, Turkey. Here, we present the first complete genome sequence of P. vervacti DSM 23571(T). A complete pathway for degradation of oxalate was revealed from the genome analysis. These data are important to path new opportunities for genetic engineering in the field of biotechnology. Copyright © 2015 Elsevier B.V. All rights reserved.

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Sunday, July 7, 2019

Complete genome sequence of Paenibacillus beijingensis 7188(T) (=DSM 24997(T)), a novel rhizobacterium from jujube garden soil.

We present here the complete genome sequence of a novel species Paenibacillus beijingensis 7188(T) (=DSM 24997(T)) from jujube rhizosphere soil that consists of one circular chromosome of 5,749,967bp with a GC content of 52.5%. On the significance of first genome information in this species, the genome sequence of strain 7188(T) will provide a better comprehension of Paenibacillus species for the practical uses as a biofertilizer in agriculture. Copyright © 2015 Elsevier B.V. All rights reserved.

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Sunday, July 7, 2019

Complete genome sequence of Corynebacterium glutamicum B253, a Chinese lysine-producing strain.

We disclosed the complete genome sequence of Corynebacterium glutamicum B253, an important lysine-producing strain in China. The genome consists a circular chromosome (3,159,203bp) and a plasmid (24,775bp), encoding 2767 protein coding genes in total. The genome contains all genes for lysine biosynthesis, and some mutations potentially relevant to lysine production were detected in comparison with sequence of other C. glutamicum. Copyright © 2015 Elsevier B.V. All rights reserved.

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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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