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Phototrophic Fe(II) oxidation by Rhodopseudomonas palustris TIE-1 in organic and Fe(II)-rich conditions.
Nikeleit, Verena; Maisch, Markus; Byrne, James M; Harwood, Caroline; Kappler, Andreas; Bryce, Casey.
Afiliación
  • Nikeleit V; Department of Geoscience, University of Tübingen, Tübingen, Germany.
  • Maisch M; Department of Geoscience, University of Tübingen, Tübingen, Germany.
  • Byrne JM; School of Earth Sciences, University of Bristol, Bristol, UK.
  • Harwood C; Department of Microbiology, University of Washington, Seattle, Washington, USA.
  • Kappler A; Department of Geoscience, University of Tübingen, Tübingen, Germany.
  • Bryce C; Cluster of Excellence: EXC 2124: Controlling Microbes to Fight Infections, Tübingen, Germany.
Environ Microbiol ; 26(3): e16608, 2024 Mar.
Article en En | MEDLINE | ID: mdl-38504412
ABSTRACT
Rhodopseudomonas palustris TIE-1 grows photoautotrophically with Fe(II) as an electron donor and photoheterotrophically with a variety of organic substrates. However, it is unclear whether R. palustris TIE-1 conducts Fe(II) oxidation in conditions where organic substrates and Fe(II) are available simultaneously. In addition, the effect of organic co-substrates on Fe(II) oxidation rates or the identity of Fe(III) minerals formed is unknown. We incubated R. palustris TIE-1 with 2 mM Fe(II), amended with 0.6 mM organic co-substrate, and in the presence/absence of CO2 . We found that in the absence of CO2 , only the organic co-substrates acetate, lactate and pyruvate, but not Fe(II), were consumed. When CO2 was present, Fe(II) and all organic substrates were consumed. Acetate, butyrate and pyruvate were consumed before Fe(II) oxidation commenced, whereas lactate and glucose were consumed at the same time as Fe(II) oxidation proceeded. Lactate, pyruvate and glucose increased the Fe(II) oxidation rate significantly (by up to threefold in the case of lactate). 57 Fe Mössbauer spectroscopy revealed that short-range ordered Fe(III) oxyhydroxides were formed under all conditions. This study demonstrates phototrophic Fe(II) oxidation proceeds even in the presence of organic compounds, and that the simultaneous oxidation of organic substrates can stimulate Fe(II) oxidation.
Asunto(s)

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Rhodopseudomonas / Dióxido de Carbono / Compuestos Férricos Idioma: En Revista: Environ Microbiol Asunto de la revista: MICROBIOLOGIA / SAUDE AMBIENTAL Año: 2024 Tipo del documento: Article País de afiliación: Alemania

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Asunto principal: Rhodopseudomonas / Dióxido de Carbono / Compuestos Férricos Idioma: En Revista: Environ Microbiol Asunto de la revista: MICROBIOLOGIA / SAUDE AMBIENTAL Año: 2024 Tipo del documento: Article País de afiliación: Alemania