Reduction of structural Fe(III) in nontronite by humic substances in the absence and presence of <i>Shewanella putrefaciens</i> and accompanying secondary mineralization

Zuo, Hongyan; Huang, Liuqin; Chu, Rosalie K.; Tolić, Nikola; Washton, Nancy M.; Zhu, Zihua; Edelmann, Richard E.; Elagamy, Samar H.; Sommer, André J.; Luan, Fubo; Zeng, Qiang; Yu, C. X.; Hu, Deyong; Zhan, Da; Hu, Jinglong; Dong, Huijuan

doi:10.2138/am-2021-7828

Cited by 10 publications

(2 citation statements)

References 109 publications

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“…Iron-bearing smectites are practically ubiquitous in soils and sediments, where they can support microbial life and catalyze environmentally significant processes. Previous studies have established that FeRB can reduce Fe(III) in smectite, ,,− and resulting redox changes alter the reactivity of smectites toward metals and organic contaminants. ,,,, Our work showed that trioctahedral Fe(II)-smectite can be used as an electron source to support the growth of a common, widely distributed microaerophilic Fe(II) oxidizer. Biotic Fe(II) oxidation may result in accelerated smectite Fe(II) oxidation under some conditions but not others, and yet, in either case, smectite oxidation fuels growth.…”

Section: Discussionmentioning

confidence: 62%

Biological Oxidation of Fe(II)-Bearing Smectite by Microaerophilic Iron Oxidizer Sideroxydans lithotrophicus Using Dual Mto and Cyc2 Iron Oxidation Pathways

Zhou

Kupper

Catalano

et al. 2022

Environ. Sci. Technol.

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Fe(II) clays are common across many environments, making them a potentially significant microbial substrate, yet clays are not well established as an electron donor. Therefore, we explored whether Fe(II)-smectite supports the growth of Sideroxydans lithotrophicus ES-1, a microaerophilic Fe(II)-oxidizing bacterium (FeOB), using synthesized trioctahedral Fe(II)-smectite and 2% oxygen. S. lithotrophicus grew substantially and can oxidize Fe(II)-smectite to a higher extent than abiotic oxidation, based on X-ray near-edge spectroscopy (XANES). Sequential extraction showed that edge-Fe(II) is oxidized before interior-Fe(II) in both biotic and abiotic experiments. The resulting Fe(III) remains in smectite, as secondary minerals were not detected in biotic and abiotic oxidation products by XANES and Mossbauer spectroscopy. To determine the genes involved, we compared S. lithotrophicus grown on smectite versus Fe(II)-citrate using reverse-transcription quantitative PCR and found that cyc2 genes were highly expressed on both substrates, while mtoA was upregulated on smectite. Proteomics confirmed that Mto proteins were only expressed on smectite, indicating that ES-1 uses the Mto pathway to access solid Fe(II). We integrate our results into a biochemical and mineralogical model of microbial smectite oxidation. This work increases the known substrates for FeOB growth and expands the mechanisms of Fe(II)-smectite alteration in the environment.

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Section: Discussionmentioning

confidence: 62%

Biological Oxidation of Fe(II)-Bearing Smectite by Microaerophilic Iron Oxidizer Sideroxydans lithotrophicus Using Dual Mto and Cyc2 Iron Oxidation Pathways

Zhou

Kupper

Catalano

et al. 2022

Environ. Sci. Technol.

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“…Thus, they contribute to the creation of biogeochemical gradients, such as redox gradients in sediments and water columns ( Acosta-González and Marqués, 2016 ). Facultative bacteria are abundant in soil ( Table S1 in Supplementary material ), playing a crucial role in organic matter decomposition, element cycling, and the transformation of various compounds under changing oxygen conditions ( McNally et al, 1998 ; Grishchenkov et al, 2000 ; Cason et al, 2019 ; Zuo et al, 2021 ; Sheng et al, 2021a ; Dong et al, 2023a ). In anaerobic environments, such as wetlands and sediments, facultative anaerobes can make up a substantial proportion of the microbial community ( Bai et al, 2000 ; Zhu et al, 2011 ).…”

Section: Discussionmentioning

confidence: 99%

Differential degradation of petroleum hydrocarbons by Shewanella putrefaciens under aerobic and anaerobic conditions

Li,

Liu,

Guo

et al. 2024

Front. Microbiol.

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The complexity of crude oil composition, combined with the fluctuating oxygen level in contaminated environments, poses challenges for the bioremediation of oil pollutants, because of compound-specific microbial degradation of petroleum hydrocarbons under certain conditions. As a result, facultative bacteria capable of breaking down petroleum hydrocarbons under both aerobic and anaerobic conditions are presumably effective, however, this hypothesis has not been directly tested. In the current investigation, Shewanella putrefaciens CN32, a facultative anaerobic bacterium, was used to degrade petroleum hydrocarbons aerobically (using O2 as an electron acceptor) and anaerobically (using Fe(III) as an electron acceptor). Under aerobic conditions, CN32 degraded more saturates (65.65 ± 0.01%) than aromatics (43.86 ± 0.03%), with the following order of degradation: dibenzofurans > n-alkanes > biphenyls > fluorenes > naphthalenes > alkylcyclohexanes > dibenzothiophenes > phenanthrenes. In contrast, under anaerobic conditions, CN32 exhibited a higher degradation of aromatics (53.94 ± 0.02%) than saturates (23.36 ± 0.01%), with the following order of degradation: dibenzofurans > fluorenes > biphenyls > naphthalenes > dibenzothiophenes > phenanthrenes > n-alkanes > alkylcyclohexanes. The upregulation of 4-hydroxy-3-polyprenylbenzoate decarboxylase (ubiD), which plays a crucial role in breaking down resistant aromatic compounds, was correlated with the anaerobic degradation of aromatics. At the molecular level, CN32 exhibited a higher efficiency in degrading n-alkanes with low and high carbon numbers relative to those with medium carbon chain lengths. In addition, the degradation of polycyclic aromatic hydrocarbons (PAHs) under both aerobic and anaerobic conditions became increasingly difficult with increased numbers of benzene rings and methyl groups. This study offers a potential solution for the development of targeted remediation of pollutants under oscillating redox conditions.

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Dissolved Mn2+ promotes microbially-catalyzed protodolomite precipitation in brackish oxidized water

Han,

Li,

Zhao

et al. 2024

Chemical Geology

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Reduction of structural Fe(III) in nontronite by humic substances in the absence and presence of Shewanella putrefaciens and accompanying secondary mineralization

Cited by 10 publications

References 109 publications

Biological Oxidation of Fe(II)-Bearing Smectite by Microaerophilic Iron Oxidizer Sideroxydans lithotrophicus Using Dual Mto and Cyc2 Iron Oxidation Pathways

Biological Oxidation of Fe(II)-Bearing Smectite by Microaerophilic Iron Oxidizer Sideroxydans lithotrophicus Using Dual Mto and Cyc2 Iron Oxidation Pathways

Differential degradation of petroleum hydrocarbons by Shewanella putrefaciens under aerobic and anaerobic conditions

Dissolved Mn2+ promotes microbially-catalyzed protodolomite precipitation in brackish oxidized water

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