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Towards determining details of anaerobic growth coupled to ferric iron reduction by the acidophilic archaeon 'Ferroplasma acidarmanus' Fer1.
Umeå University, Faculty of Science and Technology, Molecular Biology (Faculty of Science and Technology).
2007 (English)In: Extremophiles, ISSN 1431-0651, Vol. 11, no 1, 159-68 p.Article in journal (Refereed) Published
Abstract [en]

Elucidation of the different growth states of Ferroplasma species is crucial in understanding the cycling of iron in acid leaching sites. Therefore, a proteomic and biochemical study of anaerobic growth in 'Ferroplasma acidarmanus' Fer1 has been carried out. Anaerobic growth in Ferroplasma spp. occurred by coupling oxidation of organic carbon with the reduction of Fe(3+); but sulfate, nitrate, sulfite, thiosulfate, and arsenate were not utilized as electron acceptors. Rates of Fe(3+) reduction were similar to other acidophilic chemoorganotrophs. Analysis of the 'F. acidarmanus' Fer1 proteome by 2-dimensional polyacrylamide gel electrophoresis revealed ten key proteins linked with central metabolic pathways > or =4 fold up-regulated during anaerobic growth. These included proteins putatively identified as associated with the reductive tricarboxylic acid pathway used for anaerobic energy production, and others including a putative flavoprotein involved in electron transport. Inhibition of anaerobic growth and Fe(3+) reduction by inhibitors suggests the involvement of electron transport in Fe(3+)reduction. This study has increased the knowledge of anaerobic growth in this biotechnologically and environmentally important acidophilic archaeon.

Place, publisher, year, edition, pages
2007. Vol. 11, no 1, 159-68 p.
Keyword [en]
Anaerobiosis, Archaea/classification/*growth & development/metabolism, Archaeal Proteins/*metabolism, Citric Acid Cycle, Cytochromes b/metabolism, Cytochromes c/metabolism, Electron Transport, Electrophoresis; Gel; Two-Dimensional, Ferric Compounds/*metabolism, Hydrogen-Ion Concentration, Oxidation-Reduction, Proteomics/methods, Spectrophotometry
URN: urn:nbn:se:umu:diva-16786PubMedID: 17048042OAI: diva2:156459
Available from: 2007-10-12 Created: 2007-10-12 Last updated: 2011-01-11Bibliographically approved

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Dopson, Mark
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Molecular Biology (Faculty of Science and Technology)

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