The influence of extracellular superoxide on iron redox chemistry and bioavailability to aquatic microorganisms

Frontiers in Microbiology

Andrew eRose¹ 

[1] Southern Cross University;

关键词: Iron;    superoxide;    bioavailability;   

DOI  :  10.3389/fmicb.2012.00124

来源: DOAJ

【 摘 要 】

Superoxide, the one-electron reduced form of dioxygen, is produced in the extracellular milieu of aquatic microbes through a range of abiotic chemical processes and also by microbes themselves. Due to its ability to promote both oxidative and reductive reactions, superoxide may have a profound impact on the redox state of iron, potentially influencing iron solubility, complex speciation and bioavailability. The interplay between iron, superoxide and oxygen may also produce a cascade of other highly reactive transients in oxygenated natural waters. For microbes, the overall effect of reactions between superoxide and iron may be deleterious or beneficial, depending on the organism and its chemical environment. Here I critically discuss recent advances in understanding: (i) sources of extracellular superoxide in natural waters, with a particular emphasis on microbial generation; (ii) the chemistry of reactions between superoxide and iron; and (iii) the influence of these processes on iron bioavailability and microbial iron nutrition.

【 授权许可】

Unknown