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Anaerobic ACE-degrading consortia

ABSTRACT: Anoxic acesulfame biodegradation coupled to nitrate reduction

PROVIDER: PRJNA749893 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	JAHYXN01.dat.gz	Other
	JAHYXN01.fasta.gz	Fasta.gz
	JAHYXN01.master.dat	Other
	JAMLHZ01.dat.gz	Other

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ACE-degrading consortia

Project description:Acesulfame aerobic biodegradation by enriched consortia and Chelatococcus spp.: kinetics, transformation products and genomic characterization

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Next Generation Metatranscriptome Sequencing of an Anaerobic Hexadecane-Degrading Microbial Consortia

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Project description:Anaerobic antimonite oxidation coupled with nitrate reduction

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The global anaerobic metabolism regulator fnr is necessary for the degradation of food dyes and drugs by Escherichia coli

Project description:The microbiome is an underappreciated contributor to intestinal drug metabolism with broad implications for drug efficacy and toxicity. While considerable progress has been made towards identifying the gut bacterial genes and enzymes involved, the role of environmental factors in shaping their activity remains poorly understood. Here, we focus on the gut bacterial reduction of azo bonds (R-N=N-R’), found in diverse chemicals in both food and drugs. Surprisingly, the canonical azoR gene in Escherichia coli was dispensable for azo bond reduction. Instead, azo reductase activity was controlled by the fumarate and nitrate reduction (fnr) regulator, consistent with a requirement for the anoxic conditions found within the gastrointestinal tract. Paired transcriptomic and proteomic analysis of the fnr regulon revealed that in addition to altering the expression of multiple reductases, FNR is necessary for the metabolism of L-Cysteine to hydrogen sulfide, enabling the degradation of azo bonds. Furthermore, we found that FNR indirectly regulates this process though the small non-coding regulatory RNA fnrS. Taken together, these results show how gut bacteria sense and respond to their intestinal environment to enable the metabolism of chemical groups found in both dietary and pharmaceutical compounds.

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Metabolic flexibility of SUP05 under low DO growth conditions

Project description:Chemoautotrophic bacteria from the SUP05 clade often dominate anoxic waters in marine oxygen minimum zones (OMZs) where reduced sulfur can fuel carbon fixation and denitrification. Some members of the SUP05 clade are facultative aerobes that thrive at the boundaries of OMZs where they experience fluctuations in dissolved oxygen (DO). The degree to which SUP05 contribute to nitrate reduction in these regions depends on their sensitivity to oxygen. We evaluated growth and quantified differences in gene expression in Ca. T. autotrophicus strain EF1 from the SUP05 clade under high DO (22 μM), anoxic, and low DO (3.8 μM) concentrations. We show that strain EF1 cells respire oxygen and nitrate and that cells have higher growth rates, express more genes, and fix more carbon when oxygen becomes available for aerobic respiration. Evidence that facultatively aerobic SUP05 are more active and respire nitrate when oxygen becomes available at low concentrations suggests that they are an important source of nitrite across marine OMZ boundary layers.

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