Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1818349116 |
Complete arsenic-based respiratory cycle in the marine microbial communities of pelagic oxygen-deficient zones | |
Saunders, Jaclyn K.1,2; Fuchsman, Clara A.1,3; McKay, Cedar1; Rocap, Gabrielle1 | |
2019 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA |
ISSN | 0027-8424 |
出版年 | 2019 |
卷号 | 116期号:20页码:9925-9930 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Microbial capacity to metabolize arsenic is ancient, arising in response to its pervasive presence in the environment, which was largely in the form of As(III) in the early anoxic ocean. Many biological arsenic transformations are aimed at mitigating toxicity; however, some microorganisms can respire compounds of this redox-sensitive element to reap energetic gains. In several modern anoxic marine systems concentrations of As(V) are higher relative to As(III) than what would be expected from the thermodynamic equilibrium, but the mechanism for this discrepancy has remained unknown. Here we present evidence of a complete respiratory arsenic cycle, consisting of dissimilatory As(V) reduction and chemo-autotrophic As(III) oxidation, in the pelagic ocean. We identified the presence of genes encoding both subunits of the respiratory arsenite oxidase AioA and the dissimilatory arsenate reductase ArrA in the Eastern Tropical North Pacific (ETNP) oxygen-deficient zone (ODZ). The presence of the dissimilatory arsenate reductase gene arrA was enriched on large particles (> 30 um), similar to the forward bacterial dsrA gene of sulfate-reducing bacteria, which is involved in the cryptic cycling of sulfur in ODZs. Arsenic respiratory genes were expressed in metatranscriptomic libraries from the ETNP and the Eastern Tropical South Pacific (ETSP) ODZ, indicating arsenotrophy is a metabolic pathway actively utilized in anoxic marine water columns. Together these results suggest arsenic-based metabolisms support organic matter production and impact nitrogen bio-geochemical cycling in modern oceans. In early anoxic oceans, especially during periods of high marine arsenic concentrations, they may have played a much larger role. |
英文关键词 | oxygen deficient zones arsenic chemoautotrophy dissimilatory arsenate reduction marine metagenome |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000467804000042 |
WOS关键词 | MULTIPLE SEQUENCE ALIGNMENT ; METABOLISM ; READS ; OCEAN ; GENERATION ; OXIDATION ; ACCURACY ; ECOLOGY ; OXIDASE |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205114 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Washington, Sch Oceanog, Seattle, WA 98195 USA; 2.Woods Hole Oceanog Inst, Marine Chem & Geochem, Woods Hole, MA 02543 USA; 3.Univ Maryland, Horn Point Lab, Cambridge, MD 21613 USA |
推荐引用方式 GB/T 7714 | Saunders, Jaclyn K.,Fuchsman, Clara A.,McKay, Cedar,et al. Complete arsenic-based respiratory cycle in the marine microbial communities of pelagic oxygen-deficient zones[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(20):9925-9930. |
APA | Saunders, Jaclyn K.,Fuchsman, Clara A.,McKay, Cedar,&Rocap, Gabrielle.(2019).Complete arsenic-based respiratory cycle in the marine microbial communities of pelagic oxygen-deficient zones.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(20),9925-9930. |
MLA | Saunders, Jaclyn K.,et al."Complete arsenic-based respiratory cycle in the marine microbial communities of pelagic oxygen-deficient zones".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.20(2019):9925-9930. |
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