Methylmercury carbon isotope fractionation during biotic methylation by the bacterial BerOc1 strain

IF 11.4 1区 工程技术 Q1 ENGINEERING, CHEMICAL
Luisa M. Malberti-Quintero, Jin-Ping Xue, Remy Guyoneaud, Alina Kleindienst, Christelle Lagane, Laure Laffont, Jeroen E. Sonke, Zoyne Pedrero, Emmanuel Tessier, David Amouroux, David Point
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Abstract

Biotic methylation of inorganic mercury (iHg) in aquatic systems is largely driven by microorganisms such as sulfate-reducing bacteria (SRB). Using the SRB model strain Pseudodesulfovibrio hydrargyri BerOc1 we investigated biotic iHg methylation aiming to assess the rates of mono-methylmercury (CH3Hg) production and to characterize the carbon (C) isotopic signatures (δ13C) of the CH3Hg product. BiogenicCH3Hg exhibited δ13C values averaging −23.1 ± 2.0‰, representing a 13C-depletion of 14.4‰ compared to the pyruvate carbon source used for the growing of the strain and a 9‰ depletion relative to the microbial biomass. The maximum methylation yield observed in our samples was around 15% of the available iHg and a constant C isotope fractionation was detected over time. We propose that the methyl group is metabolically transferred from the carbon sources to cobalamin in the HgcA protein and subsequently to inorganic mercury (iHg), leading to consistent light C isotope enriched CH3Hg signatures.

Abstract Image

细菌BerOc1菌株在生物甲基化过程中的甲基汞碳同位素分馏
水生系统中无机汞(iHg)的生物甲基化主要是由硫酸盐还原菌(SRB)等微生物驱动的。利用SRB模型菌株Pseudodesulfovibrio hydrargyri BerOc1研究了生物汞甲基化,旨在评估单甲基汞(CH3Hg)的生成速率,并表征CH3Hg产物的碳(C)同位素特征(δ13C)。BiogenicCH3Hg的δ13C平均值为- 23.1±2.0‰,与菌株生长所用的丙酮酸碳源相比,δ13C损耗为14.4‰,与微生物生物量相比,δ13C损耗为9‰。在我们的样品中观察到的最大甲基化产率约为可用iHg的15%,并且随着时间的推移检测到恒定的C同位素分馏。我们提出甲基从碳源代谢转移到HgcA蛋白中的钴胺素,随后转移到无机汞(iHg),导致一致的轻C同位素富集CH3Hg特征。
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来源期刊
npj Clean Water
npj Clean Water Environmental Science-Water Science and Technology
CiteScore
15.30
自引率
2.60%
发文量
61
审稿时长
5 weeks
期刊介绍: npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.
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