Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1073/pnas.1812098116 |
Redox and pH gradients drive amino acid synthesis in iron oxyhydroxide mineral systems | |
Barge, Laura M.1; Flores, Erika1; Baum, Marc M.2; VanderVelde, David G.3; Russell, Michael J.1 | |
2019 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2019 |
卷号 | 116期号:11页码:4828-4833 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Iron oxyhydroxide minerals, known to be chemically reactive and significant for elemental cycling, are thought to have been abundant in early-Earth seawater, sediments, and hydrothermal systems. In the anoxic Fe2+-rich early oceans, these minerals would have been only partially oxidized and thus redox-active, perhaps able to promote prebiotic chemical reactions. We show that pyruvate, a simple organic molecule that can form in hydrothermal systems, can undergo reductive amination in the presence of mixed-valence iron oxyhydroxides to form the amino acid alanine, as well as the reduced product lactate. Furthermore, geochemical gradients of pH, redox, and temperature in iron oxyhydroxide systems affect product selectivity. The maximum yield of alanine was observed when the iron oxyhydroxide mineral contained 1: 1 Fe(II): Fe(III), under alkaline conditions, and at moderately warm temperatures. These represent conditions that may be found, for example, in iron-containing sediments near an alkaline hydrothermal vent system. The partially oxidized state of the precipitate was significant in promoting amino acid formation: Purely ferrous hydroxides did not drive reductive amination but instead promoted pyruvate reduction to lactate, and ferric hydroxides did not result in any reaction. Prebiotic chemistry driven by redox-active iron hydroxide minerals on the early Earth would therefore be strongly affected by geochemical gradients of E-h, pH, and temperature, and liquid-phase products would be able to diffuse to other conditions within the sediment column to participate in further reactions. |
英文关键词 | life emergence iron hydroxides hydrothermal vents early Earth gradients |
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:000460911500020 |
WOS关键词 | GREEN RUST ; REDUCTIVE AMINATION ; ORIGIN ; CHEMISTRY ; LIFE ; EVOLUTION ; CATALYSTS ; INSIGHTS ; NITRITE ; OXIDES |
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/205067 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.CALTECH, Jet Prop Lab, NASA, 4800 Oak Grove Dr, Pasadena, CA 91109 USA; 2.Oak Crest Inst Sci, Dept Chem, Monrovia, CA 91016 USA; 3.CALTECH, Dept Chem, Pasadena, CA 91125 USA |
推荐引用方式 GB/T 7714 | Barge, Laura M.,Flores, Erika,Baum, Marc M.,et al. Redox and pH gradients drive amino acid synthesis in iron oxyhydroxide mineral systems[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(11):4828-4833. |
APA | Barge, Laura M.,Flores, Erika,Baum, Marc M.,VanderVelde, David G.,&Russell, Michael J..(2019).Redox and pH gradients drive amino acid synthesis in iron oxyhydroxide mineral systems.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(11),4828-4833. |
MLA | Barge, Laura M.,et al."Redox and pH gradients drive amino acid synthesis in iron oxyhydroxide mineral systems".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.11(2019):4828-4833. |
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