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• W4309810314 endingPage "17453" @default.
• W4309810314 startingPage "17443" @default.
• W4309810314 abstract "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 Mössbauer 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." @default.
• W4309810314 created "2022-11-29" @default.
• W4309810314 creator A5013036206 @default.
• W4309810314 creator A5018725927 @default.
• W4309810314 creator A5031513397 @default.
• W4309810314 creator A5040119093 @default.
• W4309810314 creator A5063951090 @default.
• W4309810314 date "2022-11-23" @default.
• W4309810314 modified "2023-10-01" @default.
• W4309810314 title "Biological Oxidation of Fe(II)-Bearing Smectite by Microaerophilic Iron Oxidizer <i>Sideroxydans lithotrophicus</i> Using Dual Mto and Cyc2 Iron Oxidation Pathways" @default.
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• W4309810314 doi "https://doi.org/10.1021/acs.est.2c05142" @default.

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