Ontology highlight
ABSTRACT:
PROVIDER: PRJNA412857 | ENA |
REPOSITORIES: ENA
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Project description:We have previously reported that phosphoenolpyruvate carboxykinase(Pck) overexpression under glycolytic conditions enables Escherichia coli to harbor a high intracellular ATP pool resulting in enhanced recombinant protein synthesis and biohydrogen production. To understand possible reasons of the high ATP haboring cell, we carried out transcriptome and metabolic flux analysis.
2016-03-06 | GSE44928 | GEO
Project description:Bio-augmentation could be a promising strategy to improve processes for treatment and resource recovery from wastewater. In this study, the Gram-positive bacterium Bacillus subtilis was co-cultured with the microbial communities present in wastewater samples with high concentrations of nitrate or ammonium. Glucose supplementation (1%) was used to boost biomass growth in all wastewater samples. In anaerobic conditions, the indigenous microbial community bio-augmented with B. subtilis was able to rapidly remove nitrate from wastewater. In these conditions, B. subtilis overexpressed nitrogen assimilatory and respiratory genes including NasD, NasE, NarG, NarH, and NarI, which arguably accounted for the observed boost in denitrification. Next, we attempted to use the the ammonium- and nitrate-enriched wastewater samples bio-augmented with B. subtilis in the cathodic compartment of bioelectrochemical systems (BES) operated in anaerobic condition. B. subtilis only had low relative abundance in the microbial community, but bio-augmentation promoted the growth of Clostridium butyricum and C. beijerinckii, which became the dominant species. Both bio-augmentation with B. subtilis and electrical current from the cathode in the BES promoted butyrate production during fermentation of glucose. A concentration of 3.4 g/L butyrate was reached with a combination of cathodic current and bio-augmentation in ammonium-enriched wastewater. With nitrate-enriched wastewater, the BES effectively removed nitrate reaching 3.2 mg/L after 48 h. In addition, 3.9 g/L butyrate was produced. We propose that bio-augmentation of wastewater with B. subtilis in combination with bioelectrochemical processes could both boost denitrification in nitrate-containing wastewater and enable commercial production of butyrate from carbohydrate- containing wastewater, e.g. dairy industry discharges. These results suggest that B. subtilis bio-augmentation in our BES promotes simultaneous wastewater treatment and butyrate production.
2020-05-15 | GSE150480 | GEO
Project description:A biohydrogen and polyhydroxyalkanoates(PHA)-producing natural photoheterotrophic mixed culture composed mainly by Rhodopseudomonas palustris and Clostridium sp was studied by a proteomic analysis under non-growth conditions (nitrogen-absence and organic acids). Proteins in C. pasteurianum were upregulated, particularly those related to stress response. In contrast, C. pasteurianum in the consortium did not present such proteins, showing the advantage of being part of it. Both cultures showed proteins involved in organic acid metabolism and biohydrogen production, such as lactate dehydrogenase, ferredoxins, and hydrogenases. Proteomes of R. palustris as single culture and in consortium showed that organic acids were redirect into central carbon pathways to generate reduced equivalents for biohydrogen production. Light-harvesting proteins and fatty acid metabolism linked to PHA accumulation were also upregulated. This study provides insights into how the proteomes of individual organisms and their consortium counterparts adapt to non-growth conditions, shedding light on how microbial interactions influence protein expression.
2025-02-06 | PXD057021 | Pride
Project description:The work provides an organism-level framework describing the mechanisms underlying SCN- degradation, and opens possibilities for improving efficiency and nitrogen removal in SCN-degrading bioreactors for bioremediation of Industrial wastewater.
2016-08-29 | MSV000080104 | MassIVE