气候变化领域集成服务门户(CCPortal): Abundant nitrite-oxidizing metalloenzymes in the mesopelagic zone of the tropical Pacific Ocean

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DOI	10.1038/s41561-020-0565-6
	Abundant nitrite-oxidizing metalloenzymes in the mesopelagic zone of the tropical Pacific Ocean
	Saito M.A.; McIlvin M.R.; Moran D.M.; Santoro A.E.; Dupont C.L.; Rafter P.A.; Saunders J.K.; Kaul D.; Lamborg C.H.; Westley M.; Valois F.; Waterbury J.B.
发表日期	2020
ISSN	17520894
起始页码	355
结束页码	362
卷号	13 期号:5
英文摘要	Numerous biogeochemical reactions occur within the oceans’ major oxygen minimum zones, but less attention has been paid to the open ocean extremities of these zones. Here we report measurements on oxygen minimum zone waters from the Eastern to the Central Tropical North Pacific, which we analysed using metaproteomic techniques to discern the microbial functions present and their influence on biogeochemical cycling. We found nitrite oxidoreductase—an iron-rich enzyme from Nitrospina bacteria—to be one of the most abundant microbial proteins present in the mesopelagic zone, with over 60 billion molecules per litre. Estimated reaction rates imply that this enzyme is undersaturated and that its high abundance provides a latent mesopelagic catalytic capacity to rapidly oxidize nitrite derived from episodic fluxes of degrading sinking organic matter. In addition, given the enzyme’s intensive iron demand, its high abundance represents a previously unrecognized microbial reservoir within suboxic mesopelagic zones. Nitrite oxidoreductase may also contribute to other reactions involving nitrogen and redox-sensitive metals. We suggest that the abundance and extent of nitrite oxidoreductase may increase with continued deoxygenation in the oceans, and result in increased mesopelagic demand for iron and other potential changes to marine biogeochemical cycles. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.
英文关键词	biogeochemistry; catalysis; catalyst; enzyme; enzyme activity; mesopelagic zone; open ocean; oxygen minimum layer; seawater; Pacific Ocean; Pacific Ocean (North); Pacific Ocean (Tropical); Nitrospina
语种	英语
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206824
作者单位	Woods Hole Oceanographic Institution, Woods Hole, MA, United States; University of California, Santa Barbara, CA, United States; J. Craig Venter Institute, La Jolla, CA, United States; University of California, Irvine, CA, United States; University of California, Santa Cruz, CA, United States; National Oceanographic and Atmospheric Administration, Silver Spring, MD, United States
推荐引用方式 GB/T 7714	Saito M.A.,McIlvin M.R.,Moran D.M.,et al. Abundant nitrite-oxidizing metalloenzymes in the mesopelagic zone of the tropical Pacific Ocean[J],2020,13(5).
APA	Saito M.A..,McIlvin M.R..,Moran D.M..,Santoro A.E..,Dupont C.L..,...&Waterbury J.B..(2020).Abundant nitrite-oxidizing metalloenzymes in the mesopelagic zone of the tropical Pacific Ocean.Nature Geoscience,13(5).
MLA	Saito M.A.,et al."Abundant nitrite-oxidizing metalloenzymes in the mesopelagic zone of the tropical Pacific Ocean".Nature Geoscience 13.5(2020).