DOI: 10.1038/s41561-020-0565-6
论文题名: Abundant nitrite-oxidizing metalloenzymes in the mesopelagic zone of the tropical Pacific Ocean
作者: 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.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2020
卷: 13, 期: 5 起始页码: 355
结束页码: 362
语种: 英语
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/169666
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
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]. Nature Geoscience,2020-01-01,13(5)