Sulfur-mediated electron shuttling during bacterial iron reduction | Zendy

Theodore M. Flynn | Zendy; Edward J. O’Loughlin | Zendy; Bhoopesh Mishra | Zendy; Thomas J. DiChristina | Zendy; Kenneth Kemner | Zendy

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Sulfur-mediated electron shuttling during bacterial iron reduction

Author(s) -

Theodore M. Flynn,

Edward J. O’Loughlin,

Bhoopesh Mishra,

Thomas J. DiChristina,

Kenneth Kemner

Publication year - 2014

Publication title -

science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 12.556

H-Index - 1186

eISSN - 1095-9203

pISSN - 0036-8075

DOI - 10.1126/science.1252066

Subject(s) - shewanella oneidensis , goethite , anoxic waters , chemistry , biogeochemical cycle , electron acceptor , shewanella , sulfur , iron bacteria , inorganic chemistry , environmental chemistry , siderophore , ferrihydrite , lepidocrocite , hydrous ferric oxides , metal , bacteria , biochemistry , geology , organic chemistry , paleontology , sorption , adsorption , gene

Microbial reduction of ferric iron [Fe(III)] is an important biogeochemical process in anoxic aquifers. Depending on groundwater pH, dissimilatory metal-reducing bacteria can also respire alternative electron acceptors to survive, including elemental sulfur (S(0)). To understand the interplay of Fe/S cycling under alkaline conditions, we combined thermodynamic geochemical modeling with bioreactor experiments using Shewanella oneidensis MR-1. Under these conditions, S. oneidensis can enzymatically reduce S(0) but not goethite (α-FeOOH). The HS(-) produced subsequently reduces goethite abiotically. Because of the prevalence of alkaline conditions in many aquifers, Fe(III) reduction may thus proceed via S(0)-mediated electron-shuttling pathways.

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