Duckworth Owen W, Bargar John R, Sposito Garrison
Department of Soil Science, North Carolina State University, Raleigh, 27695-7619, USA.
Biometals. 2009 Aug;22(4):605-13. doi: 10.1007/s10534-009-9220-9. Epub 2009 Feb 24.
Siderophores, biogenic chelating agents that facilitate Fe(III) uptake through the formation of strong complexes, also form strong complexes with Mn(III) and exhibit high reactivity with Mn (hydr)oxides, suggesting a pathway by which Mn may disrupt Fe uptake. In this review, we evaluate the major biogeochemical mechanisms by which Fe and Mn may interact through reactions with microbial siderophores: competition for a limited pool of siderophores, sorption of siderophores and metal-siderophore complexes to mineral surfaces, and competitive metal-siderophore complex formation through parallel mineral dissolution pathways. This rich interweaving of chemical processes gives rise to an intricate tapestry of interactions, particularly in respect to the biogeochemical cycling of Fe and Mn in marine ecosystems.
铁载体是一种生物源螯合剂，通过形成强络合物促进铁（III）的吸收，它也能与锰（III）形成强络合物，并与锰（氢）氧化物表现出高反应性，这表明锰可能通过某种途径干扰铁的吸收。在这篇综述中，我们评估了铁和锰可能通过与微生物铁载体反应而相互作用的主要生物地球化学机制：对有限铁载体库的竞争、铁载体和金属-铁载体络合物在矿物表面的吸附，以及通过平行矿物溶解途径形成竞争性金属-铁载体络合物。这些丰富的化学过程交织在一起，形成了一幅错综复杂的相互作用图景，特别是在海洋生态系统中铁和锰的生物地球化学循环方面。
