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Complete ammonia-oxidizing bacteria (comammox)

ABSTRACT: Complete ammonia-oxidizing bacteria (comammox) Raw sequence reads

PROVIDER: PRJNA1158332 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR30596800_1.fastq.gz	Fastqsanger.gz
	SRR30596800_2.fastq.gz	Fastqsanger.gz
	SRR30596801_1.fastq.gz	Fastqsanger.gz
	SRR30596801_2.fastq.gz	Fastqsanger.gz
	SRR30596802_1.fastq.gz	Fastqsanger.gz

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Project description:The nitrogen rich compound guanidine occurs widely in nature and is used by microbes as a nitrogen source, but microorganisms that grow on guanidine have not yet been discovered. Here we show that complete ammonia-oxidizing microbes (comammox), but no other known nitrifiers, encode homologues of a guanidinase and that the comammox isolate Nitrospira inopinata grows on guanidine as sole source of energy and reductant. Proteomics, kinetic enzyme characterization, and the crystal structure of the N. inopinata guanidinase homologue demonstrated that it is a bona fide guanidinase. Transcription of comammox guanidinases was induced in wastewater treatment plant microbiomes upon incubation with guanidine, and guanidine degradation was detected in these systems. The discovery of guanidine as a selective growth substrate for comammox shows a unique niche of these globally important nitrifiers and offers new options for their isolation as well as for targeted manipulation of nitrifier communities.

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Project description:Nitrification, the oxidation of ammonia via nitrite to nitrate, has always been considered to be a two-step process catalysed by chemolithoautotrophic microorganisms oxidizing either ammonia or nitrite. No known nitrifier carries out both steps, although complete nitrification should be energetically advantageous. This functional separation has puzzled microbiologists for a century. Here we report on the discovery and cultivation of a completely nitrifying bacterium from the genus Nitrospira, a globally distributed group of nitrite oxidizers. The genome of this chemolithoautotrophic organism encodes the pathways both for ammonia and nitrite oxidation, which are concomitantly activated during growth by ammonia oxidation to nitrate. Genes affiliated with the phylogenetically distinct ammonia monooxygenase and hydroxylamine dehydrogenase genes of Nitrospira are present in many environments and were retrieved on Nitrospira contigs in new metagenomes from engineered systems. These findings fundamentally change our picture of nitrification and point to completely nitrifying Nitrospira as key components of nitrogen-cycling microbial communities.

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