PMID:16309395

Citation	Treusch, AH, Leininger, S, Kletzin, A, Schuster, SC, Klenk, HP and Schleper, C (2005) Novel genes for nitrite reductase and Amo-related proteins indicate a role of uncultivated mesophilic crenarchaeota in nitrogen cycling. Environ. Microbiol. 7:1985-95
Abstract	Mesophilic crenarchaeota are frequently found in terrestrial and marine habitats worldwide, but despite their considerable abundance the physiology of these as yet uncultivated archaea has remained unknown. From a 1.2 Gb large-insert environmental fosmid library of a calcareous grassland soil, a 43 kb genomic fragment was isolated with a ribosomal RNA that shows its affiliation to group 1.1b of crenarchaeota repeatedly found in soils. The insert encoded a homologue of a copper-containing nitrite reductase with an unusual C-terminus that encoded a potential amicyanin-like electron transfer domain as well as two proteins related to subunits of ammonia monooxygenases or particulate methane monooxygenases (AmoAB/PmoAB) respectively. Expression of nirK and the amoA-like gene was shown by reverse transcription polymerase chain reaction (PCR) analyses in soil samples, the latter being found at higher levels when the soil was incubated with ammonia (measured by quantitative PCR). Further variants of both genes were amplified from soil samples and were found in the environmental database from the Sargasso Sea plankton. Taken together, our findings suggest that mesophilic terrestrial and marine crenarchaeota might be capable of ammonia oxidation under aerobic and potentially also under anaerobic conditions.
Links	PubMed Online version:10.1111/j.1462-2920.2005.00906.x
Keywords	Amino Acid Sequence; Archaeal Proteins/genetics; Crenarchaeota/genetics; Crenarchaeota/metabolism; Molecular Sequence Data; Nitrite Reductases/genetics; Nitrogen/metabolism; Oxidoreductases/genetics; Oxygenases/genetics; Sequence Alignment; Soil Microbiology; Species Specificity
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
9BACT:A7DYA2		GO:0004497: monooxygenase activity	ECO:0000247:	UniProtKB:A5A8G2 UniProtKB:A7DYA2 UniProtKB:D1MYY0 UniProtKB:Q9ZA16	F		Figure 2.	complete CACAO 2382
9CREN:A4GIQ8		GO:0004497: monooxygenase activity	ECO:0000247:	UniProtKB:Q701V5	F		Figure 3.	complete CACAO 2383

References

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