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July 7, 2019

Complete genome sequences of historic Clostridioides difficile food-dwelling ribotype 078 strains in Canada identical to that of the historic human clinical strain M120 in the United Kingdom.

Clostridioides (Clostridium) difficile is a spore-forming anaerobic bacte- rium that causes severe intestinal diseases in humans. Here, we report the complete genome sequence of the first C. difficile foodborne type strain (PCR ribotype 078) isolated from food animals in Canada in 2004, which has 100% similarity to the ge- nome sequence of the historic human clinical strain M120.


July 7, 2019

Myxobacteria: Unraveling the potential of a unique microbiome niche

Natural products obtained from microorganisms have been playing an imperative role in drug discovery for decades. Hence, rightfully, microorganisms are considered as the richest source of biochemical remedies. In this review, we represent an unexplored family of bacteria considered to be prolific producers of diverse metabolites. Myxobacteria are gram-negative bacteria which have been reported to produce large families of secondary metabolites with prominent antimicrobial, antifungal, and antitumor activities. Klaus Gerth, Norbert Bedorf, Herbert Irschik, and Hans Reichenbach observed the antifungal activity of Sorangium cellulosum against Mucor hiemalis. In 2006, Hans Reichenbach and his team obtained a novel macrolide cruentaren A from Byssovorax cruenta (myxobacteria). Cruentaren A showed inhibitory activity against yeast and filamentous fungi. It also showed selective inhibitory activity against mitochondrial F-type ATPase. Cruentaren A has been found to be cytotoxic against various human cancer cell lines. In 2007, Reichenbach and his colleagues named an antibiotic produced by Sorangium cellulosum strain Soce895 as thuggacin. This antibiotic acts on the respiration of some bacteria. Other antibiotics from myxobacteria, myxovirescin, and megovalicin show broad-spectrum bactericidal activity. The College of Food and Bioengineering, Henan University of Science and Technology, Luoyang, China, evaluated the antitumor property of epothilone, which has shown promise for breast cancer treatment. The study determined high potential and versatile antimicrobial and antitumor secondary metabolites of myxobacteria. In yet another study, Ratjadone A, that exhibited strong antiviral activity against HIV, was obtained from Sorangium cellulosum strain. This compound shows antiviral activity in vitro but has low selectivity. Further search on the derivatives of this compound might help in the future. This is rationale enough to pre-empt that every strain of myxobacteria might be endowed to produce secondary metabolites with novel mechanisms of action which are rarely produced by other microbes. The available data establishes the impact of myxobacterial studies in search for novel metabolites as a front runner in microbiological research and worthy enough to be a thrust area of research in pharmacology.


July 7, 2019

Lifestyle of Lactobacillus hordei isolated from water kefir based on genomic, proteomic and physiological characterization.

Water kefir is a traditional fermented beverage made from sucrose, water, kefir granules, dried or fresh fruits. In our water kefir granules, Lactobacillus (L.) hordei is one of the predominant lactic acid bacteria (LAB) species of this presumed symbiotic consortium. It faces abundant sucrose versus limitation of amino- and fatty acids in an acidic environment. Sequencing of the genome of L. hordei TMW 1.1822 revealed one chromosome plus three plasmids. The size of the chromosome was 2.42?Mbp with a GC content of 35% GC and 2461 predicted coding sequences. Furthermore, we identified 1474 proteins upon growth on water kefir medium. Metabolic prediction revealed all enzymes required for the glycolytic Embden-Meyerhof (EMP) and phosphoketolase (PKP) pathways. Genes encoding all enzymes involved in citrate, pyruvate and mannitol metabolism are present. Moreover, it was confirmed that L. hordei is prototrophic for 11 amino acids and auxotrophic for 6 amino acids when combining putative biosynthesis pathways for amino acids with physiological characterization. Still, for glycine, serine and methionine no sure auxotype could be determined. The OppABCDF peptide transport system is complete, and 13 genes encoding peptidases are present. The arginine deiminase system, was predicted to be complete except for carbamate kinase, thus enabling neutralization reactions via ammonium formation but no additional energy generation. Taken together our findings enable prediction of the L. hordei lifestyle in water kefir: Abundant sucrose is consumed directly via parallel EMP and PK pathways and is also extracellularly converted to dextran and fructose by a glucansucrase, leaving fructose as additional carbon source. Essential amino acids (in the form of peptides) and citrate are acquired from fruits. In the lack of FabB unsaturated fatty acids are synthesized by predicted alternative enzymes. Formation of acetoin and diacetyl as well as arginine conversion reactions enable acidification limitation. Other members of the water kefir consortium (yeasts, acetic acid bacteria) likely facilitate or support growth of L. hordei by delivering gluconate, mannitol, amino- and fatty acids and vitamins. Copyright © 2018 Elsevier B.V. All rights reserved.


July 7, 2019

Complete genome sequence of Sulfitobacter sp. strain D7, a virulent bacterium isolated from an Emiliania huxleyi algal bloom in the North Atlantic.

A Rhodobacterales bacterium, Sulfitobacter sp. strain D7, was isolated from an Emiliania huxleyi bloom in the North Atlantic and has been shown to act as a pathogen and induce cell death of E. huxleyi during lab coculturing. We report here its complete genome sequence comprising one chromosome and five low-copy-number plasmids.


July 7, 2019

Draft genome sequence of Olsenella sp. KGMB 04489 isolated from healthy Korean human feces

The genus of Olsenella has been isolated from vertebrate animal mouth, rumen, and feces. Olsenella sp. KGMB 04489 was isolated from fecal samples obtained from a healthy Korean. The whole-genome sequence of Olsenella sp. KGMB 04489 was analyzed using the PacBio Sequel platform. The genome comprises a 2,108,034 bp chromosome with a G + C content of 65.50%, 1,838 total genes, 13 rRNA genes, and 52 tRNA genes. Also, we found that strain KGMB 04489 had some genes for hydrolysis enzymes, and antibiotic biosynthesis and resistance in its genome based on the result of genome analysis.


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