Redox cycling of Fe(II) and Fe(III) in magnetite by Fe-metabolizing bacteria
Redox cycling of Fe(II) and Fe(III) in magnetite by Fe-metabolizing bacteria
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DOI：
10.1126/science.aaa4834
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发表时间：
2015-03-27
期刊：
影响因子：
56.9
通讯作者：
Kappler, Andreas
中科院分区：
文献类型：
--
作者：
Byrne, James M.;Klueglein, Nicole;Kappler, Andreas
微生物是氧化还原诱导的铁在环境中的循环的主要控制。尽管细菌能够利用结合在固相铁矿物中的Fe（II）和Fe（III）生长，但目前尚不清楚变化的环境条件是否能够在具有不同代谢的细菌之间共享混合价铁氧化物中的电子。我们表明，通过磁性和光谱测量，光养铁（II）氧化细菌Rhodopterium palustris TIE-1氧化磁铁矿（Fe 3 O 4）纳米粒子使用光能。这个过程是可逆的，在共同培养的厌氧Fe（III）-还原细菌Geetriumsulfurreducens。这些结果表明，在不同的环境条件下，结合在高度结晶矿物磁铁矿中的铁离子作为电子汇和电子源是生物可利用的，有效地使磁铁矿成为天然存在的电池。
Microorganisms are a primary control on the redox-induced cycling of iron in the environment. Despite the ability of bacteria to grow using both Fe(II) and Fe(III) bound in solid-phase iron minerals, it is currently unknown whether changing environmental conditions enable the sharing of electrons in mixed-valent iron oxides between bacteria with different metabolisms. We show through magnetic and spectroscopic measurements that the phototrophic Fe(II)-oxidizing bacterium Rhodopseudomonas palustris TIE-1 oxidizes magnetite (Fe3O4) nanoparticles using light energy. This process is reversible in co-cultures by the anaerobic Fe(III)-reducing bacterium Geobacter sulfurreducens. These results demonstrate that Fe ions bound in the highly crystalline mineral magnetite are bioavailable as electron sinks and electron sources under varying environmental conditions, effectively rendering magnetite a naturally occurring battery.