DOI: 10.1016/j.epsl.2021.116756
论文题名: Selective uptake of rare earth elements in marine systems as an indicator of and control on aerobic bacterial methanotrophy
作者: Meyer A.C.S. ; Grundle D. ; Cullen J.T.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2021
卷: 558 语种: 英语
中文关键词: biosignature
; methane
; methanotrophy
; rare earth elements
; Sargasso Sea
; xoxF
英文关键词: Carbon
; Catalyst activity
; Genes
; Geothermal springs
; Hot springs
; Methanol
; Rare earth compounds
; Rare earths
; Time series analysis
; Heavy rare earth elements
; Hydrothermal vent
; Light rare earth elements
; Methanol dehydrogenase
; Molecular marker
; Recent researches
; Sole carbon source
; Upper water column
; Rare earth elements
; bacterium
; bioindicator
; biological uptake
; gene
; genetic marker
; marine environment
; methane
; methanotrophy
; rare earth element
; Atlantic Ocean
; Sargasso Sea
; Bacteria (microorganisms)
; Indicator indicator
英文摘要: Unicellular methanotrophs are a widespread, polyphyletic group of organisms that oxidize methane to assimilate carbon and obtain energy. Methanotrophs are of interest to astrobiologists given their prevalence in terrestrial environmental niches, like geothermal hot springs and hydrothermal vents, that are homologs for proposed extraterrestrial targets. Recent research demonstrates that light rare earth elements are required for the catalytic activity of the common xoxF isoform of methanol dehydrogenase, an enzyme in the aerobic methanotrophy pathway whose main isoform, mxa-MeDH, in contrast uses a calcium ion for catalysis. Although rare earth elements exist in picomolar concentrations in the ocean, the gene for xoxF is maintained in marine methanotrophs, pointing to a possible terrestrial origin for aerobic methanotrophy. Here we present a multi-season time series of rare earth element concentrations from autumn 2018 in the oligotrophic Sargasso Sea, and an initial analysis of molecular markers for aerobic methanotrophy in summer 2019. We observe a repeated depletion of light rare earth elements relative to heavy rare earth elements in the upper water column, between approximately 200 m and 500 m. This feature was collocated with observations of microbial growth on media with methanol as a sole carbon source, and detection of the xoxF5 gene. We aim to determine if aerobic methanotrophs generate a reproducible and identifiable signal through the selective uptake of light rare earth elements over heavier REEs that could be recorded in the geologic record indicating past aerobic methanotrophy. © 2021 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165599
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: University of Victoria, 3800 Finnerty Road, Victoria, BC V8P 5C2, Canada; Bermuda Institute of Ocean Science, 17 Biological Station, St. Georges, GE 01, Bermuda
Recommended Citation:
Meyer A.C.S.,Grundle D.,Cullen J.T.. Selective uptake of rare earth elements in marine systems as an indicator of and control on aerobic bacterial methanotrophy[J]. Earth and Planetary Science Letters,2021-01-01,558