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Friday, July 19, 2019

Complete genome sequence and analysis of Lactobacillus hokkaidonensis LOOC260(T), a psychrotrophic lactic acid bacterium isolated from silage.

Lactobacillus hokkaidonensis is an obligate heterofermentative lactic acid bacterium, which is isolated from Timothy grass silage in Hokkaido, a subarctic region of Japan. This bacterium is expected to be useful as a silage starter culture in cold regions because of its remarkable psychrotolerance; it can grow at temperatures as low as 4°C. To elucidate its genetic background, particularly in relation to the source of psychrotolerance, we constructed the complete genome sequence of L. hokkaidonensis LOOC260(T) using PacBio single-molecule real-time sequencing technology.The genome of LOOC260(T) comprises one circular chromosome (2.28 Mbp) and two circular plasmids: pLOOC260-1 (81.6 kbp) and pLOOC260-2 (41.0…

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Friday, July 19, 2019

Complete genome sequence of bacteriocin-producing Lactobacillus plantarum KLDS1.0391, a probiotic strain with gastrointestinal tract resistance and adhesion to the intestinal epithelial cells.

Lactobacillus plantarum KLDS1.0391 is a probiotic strain isolated from the traditional fermented dairy products and identified to produce bacteriocin against Gram-positive and Gram-negative bacteria. Previous studies showed that the strain has a high resistance to gastrointestinal stress and has a high adhesion ability to the intestinal epithelial cells (Caco-2). We reported the entire genome sequence of this strain, which contains a circular 2,886,607-bp chromosome and three circular plasmids. Genes, which are related to the biosynthesis of bacteriocins, the stress resistance to gastrointestinal tract environment and adhesive performance, were identified. Whole genome sequence of Lactobacillus plantarum KLDS1.0391 will be helpful for…

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Sunday, July 7, 2019

Short communication: Single molecule, real-time sequencing technology revealed species- and strain-specific methylation patterns of 2 Lactobacillus strains.

Pacific Biosciences’ (Menlo Park, CA) single molecule, real-time sequencing technology was reported to have some advantages in generating finished genomes and characterizing the epigenome of bacteria. In the present study, this technology was used to sequence 2 Lactobacillus strains, Lactobacillus casei Zhang and Lactobacillus plantarum P-8. Previously, the former bacterium was sequenced by an Applied Biosystems 3730 DNA analyzer (Grand Island, NY), whereas the latter one was analyzed with Roche 454 (Indianapolis, IN) and Illumina sequencing technologies (San Diego, CA). The results showed that single molecule, real-time sequencing resulted in high-quality, finished genomes for both strains. Interestingly, epigenome analysis indicates…

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Sunday, July 7, 2019

Complete genome sequence of Lactobacillus salivarius Ren, a probiotic strain with anti-tumor activity.

Lactobacillus salivarius Ren (LsR) (CGMCC No. 3606) is a probiotic strain that was isolated from the feces of a healthy centenarian living in Bama, Guangxi, China. Previous studies have shown that this strain decreases 4-nitroquinoline 1-oxide (4-NQO)-induced genotoxicity in vitro. It also suppresses 4-NQO-induced oral carcinogenesis and 1,2-dimethylhydrazine (DMH)-induced colorectal carcinogenesis, and therefore may be used as an adjuvant therapeutic agent for cancer. Here, we report the complete genome sequence of LsR that consists of a circular chromosome of 1751,565bp and two plasmids (pR1, 176,951bp; pR2, 49,848bp). Copyright © 2015 Elsevier B.V. All rights reserved.

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Sunday, July 7, 2019

Complete genome sequence of Lactobacillus helveticus MB2-1, a probiotic bacterium producing exopolysaccharides.

Lactobacillus helveticus MB2-1 is a probiotic bacterium producing exopolysaccharides (EPS), which was isolated from traditional Sayram ropy fermented milk in southern Xinjiang, China. The genome consists of a circular 2,084,058bp chromosome with no plasmid. The genome sequence indicated that this strain includes a 15.20kb gene cluster involved in EPS biosynthesis. Genome sequencing information has provided the basis for understanding the potential molecular mechanism behind the EPS production. Copyright © 2015 Elsevier B.V. All rights reserved.

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Sunday, July 7, 2019

Genome architecture of Lactobacillus plantarum PS128, a probiotic strain with potential immunomodulatory activity.

Clinical and preclinical observations indicate that Lactobacillus plantarum has anti-inflammatory activity and may regulate the immune responses of its hosts when ingested. Recently, modification of teichoic acids (TAs) produced by L. plantarum was reported as a key to regulating the systemic immune response in mice. However, data linking TA-related genetic determinants and the immunomodulatory effect are limited. To provide genomic information for elucidating the underlying mechanism of immunomodulation by L. plantarum, we sequenced the genome of L. plantarum strain PS128.The PS128 genome contains 11 contigs (3,325,806 bp; 44.42% GC content) after hybrid assembly of sequences derived with Illumina MiSeq and PacBio…

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Sunday, July 7, 2019

Complete genome sequence of Lactobacillus heilongjiangensis DSM 28069(T): Insight into its probiotic potential.

Lactobacillus heilongjiangensis DSM 28069(T) is a potential probiotic isolated from traditional Chinese pickle. Here we report the complete genome sequence of this strain. The complete genome is 2,790,548bp with the GC content of 37.5% and devoid of plasmids. Sets of genes involved in the biosynthesis of riboflavin and folate were identified in the genome, which revealed its potential application in biotechnological industry. The genome sequence of L. heilongjiangensis DSM 28069(T) now provides the fundamental information for future studies. Copyright © 2015. Published by Elsevier B.V.

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Sunday, July 7, 2019

Development of new methods for the quantitative detection and typing of Lactobacillus parabuchneri in dairy products

Thirty-one isolates of Lactobacillus parabuchneri were obtained from cheese containing histamine; of these, 26 were found to possess the hdcA gene encoding histidine decarboxylase. By analysing the genome data of 13 isolates, specific targets for the development of PCR-based detection and typing systems for L. parabuchneri were identified. The real-time PCR for detection showed a linear quantification over a range of 7 logs and a detection limit of 10 gene equivalents per reaction. The strain typing method utilised the amplification of repeat sequences and showed discrimination comparable with a phylogenetic tree, based on genome comparisons. The method was suitable for detecting…

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Sunday, July 7, 2019

Potential probiotic-associated traits revealed from completed high quality genome sequence of Lactobacillus fermentum 3872.

The article provides an overview of the genomic features of Lactobacillus fermentum strain 3872. The genomic sequence reported here is one of three L. fermentum genome sequences completed to date. Comparative genomic analysis allowed the identification of genes that may be contributing to enhanced probiotic properties of this strain. In particular, the genes encoding putative mucus binding proteins, collagen-binding proteins, class III bacteriocin, as well as exopolysaccharide and prophage-related genes were identified. Genes related to bacterial aggregation and survival under harsh conditions in the gastrointestinal tract, along with the genes required for vitamin production were also found.

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Sunday, July 7, 2019

Complete genome sequence of the dairy isolate Lactobacillus acidipiscis ACA-DC 1533.

Lactobacillus acidipiscis is a Gram-positive lactic acid bacterium belonging to the Lactobacillus salivarius clade. Here, we present the first complete genome sequence of L. acidipiscis isolated from traditional Greek Kopanisti cheese. Strain ACA-DC 1533 may play a key role in the strong organoleptic characteristics of Kopanisti cheese. Copyright © 2017 Kazou et al.

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Sunday, July 7, 2019

Complete genome sequence of Lactobacillus jensenii strain SNUV360, a probiotic for treatment of bacterial vaginosis isolated from the vagina of a healthy Korean woman.

Lactobacillus jensenii SNUV360 is a potential probiotic strain that shows antimicrobial activity for the treatment of bacterial vaginosis. Here, we present the complete genomic sequence of L. jensenii SNUV360, isolated from a vaginal sample from a healthy Korean woman. Analysis of the sequence may provide insight into its functional activity. Copyright © 2017 Lee et al.

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Sunday, July 7, 2019

The histidine decarboxylase gene cluster of Lactobacillus parabuchneri was gained by horizontal gene transfer and is mobile within the species.

Histamine in food can cause intolerance reactions in consumers. Lactobacillus parabuchneri (L. parabuchneri) is one of the major causes of elevated histamine levels in cheese. Despite its significant economic impact and negative influence on human health, no genomic study has been published so far. We sequenced and analyzed 18 L. parabuchneri strains of which 12 were histamine positive and 6 were histamine negative. We determined the complete genome of the histamine positive strain FAM21731 with PacBio as well as Illumina and the genomes of the remaining 17 strains using the Illumina technology. We developed the synteny aware ortholog finding algorithm…

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