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ABSTRACT: nosZ gene

PROVIDER: PRJNA525158 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	SRR8655630.fastq.gz	Fastqsanger.gz
	SRR8655640.fastq.gz	Fastqsanger.gz
	SRR8655650.fastq.gz	Fastqsanger.gz
	SRR8655631.fastq.gz	Fastqsanger.gz
	SRR8655641.fastq.gz	Fastqsanger.gz

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Community composition of nitrous oxide reducing bacteria investigated using a functional gene microarray

Project description:The diversity and environmental distribution of the nosZ gene, which encodes the enzyme responsible for the consumption of nitrous oxide, was investigated in marine and terrestrial environments using a functional gene microarray. The microbial communities represented by the nosZ gene probes showed strong biogeographical separation, with communities from surface ocean waters and agricultural soils significantly different from each other and from those in oceanic oxygen minimum zones. Atypical nosZ genes, usually associated with incomplete denitrification pathways, were detected in all the environments, including surface ocean waters. The abundance of nosZ genes, as estimated by quantitative PCR, was highest in the agricultural soils and lowest in surface ocean waters.

2018-10-19 | GSE121473 | GEO

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Denitrification by bradyrhizobia under feast and famine and the role of the bc1 complex in securing electrons for N2O reduction

Project description:Rhizobia living as microsymbionts inside nodules have stable access to carbon substrates, but also have to survive as free-living bacteria in soil where they are starved for carbon and energy most of the time. Many rhizobia can denitrify, thus switch to anaerobic respiration under low O2 tension using N-oxides as electron acceptors. The cellular machinery regulating this transition is relatively well-known from studies under optimal laboratory conditions, while little is known about this regulation in starved organisms. It is, for example, not known if the strong preference for N2O- over NO3--reduction in bradyrhizobia is retained under carbon limitation. Here we show that starved cultures of a Bradyrhizobium strain with respiration rates 1-18% of well-fed cultures, reduced all available N2O before touching provided NO3-. These organisms, which carry out complete denitrification, have the periplasmic nitrate reductase NapA but lack the membrane-bound nitrate reductase NarG. Proteomics showed similar levels of NapA and NosZ (N2O reductase), excluding that the lack of NO3- reduction was due to low NapA abundance. Instead, this points to a metabolic-level phenomenon where the bc1 complex, which channels electrons to NosZ via cytochromes, is a much stronger competitor for electrons from the quinol pool than the NapC enzyme, which provides electrons to NapA via NapB. The results contrast the general notion that NosZ activity diminishes under carbon limitation and suggest that bradyrhizobia carrying NosZ can act as strong sinks for N2O under natural conditions, implying that this criterion should be considered in the development of biofertilizers.

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Project description:nitrogen cycling on nosZ gene in agroecosystem