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ABSTRACT: Nitric oxide-dependent anaerobic ammonium oxidation

PROVIDER: PRJNA485513 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7685290.fastq.gz	Fastqsanger.gz
	SRR7685291.fastq.gz	Fastqsanger.gz
	SRR7685292.fastq.gz	Fastqsanger.gz
	SRR7685284.fastq.gz	Fastqsanger.gz
	SRR7685285.fastq.gz	Fastqsanger.gz

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Nitric oxide-dependent anaerobic ammonium oxidation

Project description:Nitric oxide (NO) has several important functions in biology and atmospheric chemistry as a toxin, signaling molecule, ozone depleting agent and the precursor of the greenhouse gas nitrous oxide (N2O). Even though NO is a potent oxidant, and was available on earth earlier than oxygen, its direct use by microorganisms for growth was not demonstrated before. Using physiological experiments, metatranscriptomics and metaproteomics, here we show that anaerobic ammonium-oxidizing (anammox) bacterium Kuenenia stuttgartiensis grow by coupling ammonium oxidation to NO reduction, and produce only N2. Such a metabolism could have existed on early earth, and has implications in controlling N2O and NO emissions both from natural and manmade ecosystems, where anammox bacteria contribute significantly to N2 release to the atmosphere.

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Oleic acid-dependent modulation of Nitric Oxide Associated 1 protein levels regulate nitric oxide mediate signaling in plant defense.

Project description:Oleic acid-dependent modulation of Nitric Oxide Associated 1 protein levels regulate nitric oxide- mediate signaling in plant defense. Nitric Oxide, Oleic acid, Salicylic acid, Arabidopsis, Defense Wild-type Col-0, mutant genotypes ssi2, ssi2 act1 and ssi2 sid2 with three biological replicates were analyzed (one array each)

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Transcriptome Kuenenia stuttgartiensis bioreactor

Project description:Anaerobic ammonium-oxidising (anammox) bacteria, members of the ‘Candidatus Brocadiaceae’ family, play an important role in the nitrogen cycle and are estimated to be responsible for about half of the oceanic nitrogen loss to the atmosphere. Anammox bacteria combine ammonium with nitrite and produce dinitrogen gas via the intermediates nitric oxide and hydrazine (anammox reaction) while nitrate is formed as a by-product. These reactions take place in a specialized, membrane-bound compartment called the anammoxosome. Therefore, the substrates ammonium, nitrite and product nitrate have to cross the outer-, cytoplasmic- and anammoxosome membranes to enter or exit the anammoxosome. The genomes of all anammox species harbour multiple copies of ammonium-, nitrite- and nitrate transporter genes. Here we investigated how the distinct genes for ammonium-, nitrite- and nitrate- transport were expressed during substrate limitation in membrane bioreactors. Transcriptome analysis of Kuenenia stuttgartiensis planktonic cells under ammonium-limitation showed that three of the seven ammonium transporter genes and one of the six nitrite transporter genes were significantly upregulated, while another ammonium and nitrite transporter gene were downregulated in nitrite limited growth conditions. The two nitrate transporters were expressed to similar levels in both conditions. In addition, genes encoding enzymes involved in the anammox reaction were differentially expressed, with those using nitrite as a substrate being upregulated under nitrite limited growth and those using ammonium as a substrate being upregulated during ammonium limitation. Taken together, these results give a first insight in the potential role of the multiple nutrient transporters in regulating transport of substrates and products in and out of the compartmentalized anammox cell.

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