摘要
铁呼吸是厌氧环境中普遍存在的一种微生物代谢形式,多种古生菌和细菌都能进行铁呼吸。Fe(Ⅲ)的地球化学丰度比较高,为Fe(Ⅲ)还原菌提供了充足的电子受体,但自然中Fe(Ⅲ)多以不溶形式存在,使电子传递受阻。本文介绍了Fe(Ⅲ)还原菌的多样性,总结了4种铁呼吸机制:直接接触机制、螯合促溶机制、电子穿梭机制、纳米导线辅助机制,并对铁呼吸机制未来的研究方向进行了展望。
Fe （ Ⅲ ） respiration is an ubiquitous metabolism type of microbes under anaerobic circumstance. Many kinds of archaea and bacteria can respire with Fe （ Ⅲ ） oxides as terminal electron acceptor. Fe （ Ⅲ ） is abundant in natural environment, which can provide enough electron acceptors for dissimilatory Fe （ Ⅲ ）-reducing microbes. However, electron transfer is restricted, because most Fe （ Ⅲ ） is insoluble under natural conditions. This paper introduced the diversity of dissimilatory Fe （ Ⅲ ）-reducing microbes, summarized four＋mechanisms of Fe （ Ⅲ ） respiration, i. e. , direct cell contact with Fe （ Ⅲ ） oxides, chelation that solubilizes Fe （ Ⅲ ）, electron shuttling, and bacterial nanowires that serve as the conduits for transferring electrons from cells to mineral surfaces, and proposed future research directions on the mechanisms of microbial Fe（ Ⅲ ） respiration.
出处
《生态学杂志》
CAS
CSCD
北大核心
2008年第6期1037-1042,共6页
Chinese Journal of Ecology
基金
国家自然科学基金资助项目(40601043,20777013)
