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首页> 外文期刊>Environmental Science & Technology >Use of superoxide as an electron shuttle for iron acquisition by the marine cyanobacterium Lyngbya majuscula
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Use of superoxide as an electron shuttle for iron acquisition by the marine cyanobacterium Lyngbya majuscula

机译：超氧化物作为电子穿梭物用于海洋蓝细菌Lyngbya majuscula的铁捕获

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摘要

Reduction of iron from the ferric state to the ferrous state is one strategy employed by microorganisms in near-neutral environments to increase its biological availability. In recent years, the existence of mobile reducing agents produced by microorganisms to promote iron reduction,known as electron shuttles, has been demonstrated. Production of electron shuttles has been shown for several organisms, employing a variety of mostly organic molecules as the electron carrier. Here we show that the coastal cyanobacterium Lyngbya majuscula produces iron-reducing superoxide radicals (O-2(center dot)-) and that this facilitates increased iron uptake. We suggest that superoxide is a useful electron shuttle because it reacts rapidly and almost indiscriminately with Fe(III)-organic complexes and its precursor, dissolved oxygen, is ubiquitous in the photic zone. We further suggest that, for these reasons, the generation of superoxide by marine oxygenic photosynthetic microorganisms and its use in facilitating iron uptake may be a reasonably widespread process.
机译：铁从铁状态还原为亚铁状态是近中性环境中微生物采用的一种提高其生物利用率的策略。近年来，已经证明存在由微生物产生的促进铁还原的可移动还原剂，称为电子梭。已经显示了几种生物的电子穿梭物的生产，它们采用了各种主要是有机分子作为电子载体。在这里，我们显示沿海蓝藻Lyngbya majuscula产生了铁还原超氧化物自由基（O-2（中心点）-），并且这有助于增加铁的吸收。我们认为超氧化物是有用的电子穿梭物，因为它与Fe（III）-有机配合物反应迅速且几乎不加区别地反应，并且其前体溶解氧在光化学区普遍存在。由于这些原因，我们进一步建议，海洋氧合光合微生物产生超氧化物及其在促进铁吸收中的用途可能是一个合理的广泛过程。

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