Vibrio sp.
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ABSTRACT:
REPOSITORIES: ENA
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Project description:The majority of potent greenhouse gas nitrous oxide (N2O) emissions originate from microbially mediated reactions. The enzyme N2O reductase is the only known biological N2O sink and has evolved in two phylogenetically distinct lineages (clades I and II). Clade II is of particular interest for biotechnology as it is often associated with non-denitrifying N2O reducers. In this study, Laureni et al. investigated the environmental conditions that select for clade II. To do so, we enriched two N2O-respiring communities at low dilution rates, under both electron donor (acetate) and electron acceptor (N2O) limitations, in order to assess the impact of substrate affinity and N2O cytotoxicity on community assembly. We used a combination of genome-resolved metagenomics and shotgun metaproteomics to identify the taxonomy and metabolic potential of the steady-state community members. Corresponding author: Michele Laureni, contact: m.laureni@tudelft.nl
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Project description:Vibrio vulnificus Clade T Genome sequencing and assembly
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Project description:We report here the genome sequences of the novel isolates G62T and G98T from rhodoliths. The nearly complete genomes consisted of 4.7 Mbp (4,233 coding sequences [CDS]) for G62T and 4.5 Mbp (4,085 CDS) for G98T. Genomic taxonomy places these new genomes into 2 new species.
| S-EPMC6256479 | biostudies-literature
Project description:Brown macroalgae holds an enormous potential as a future feedstock because it rapidly forms large biomasses and has high carbohydrate content (35% of its dry weight consists of alginate and mannitol). However, utilization of brown macroalgae by conventional microbial platforms (e.g., Escherichia coli and Saccharomyces cerevisiae) has been limited due to the inability of these platforms to metabolize alginate. Although recent studies engineered them to utilize alginate, their growth rates and metabolic activities are still too low for industrial applications, likely due to the unoptimized expression of multiple xenogeneic genes. Here, we isolated Vibrio sp. dhg, a novel, fast-growing bacterium that has been naturally evolved for efficient alginate assimilation (growth rate = 0.98 h-1). Especially, both the growth rate and sugar uptake rate of V. sp. dhg are substantially higher than the rates of E. coli for most biomass-derivable sugars. Based on our systematic characterization of its metabolism and gene expression architecture, we were able to develop a genetic toolbox for its engineering. By using this microorganism, we successfully demonstrated its ability to produce a broad spectrum of chemicals from alginate-mannitol mixtures with high productivities (1.1 g ethanol/L/h, 1.3 g 2,3-butanediol and acetoin/L/h, and 0.69 mg lycopene/L/h). Collectively, the V. sp. dhg strain is a powerful platform for the conversion of brown macroalgae sugars whose usage will dramatically accelerate the production of value-added biochemicals in the future.
2019-05-02 | GSE119357 | GEO