生态学报2017，Vol.37Issue(8)：2540-2550,11.DOI:10.5846/stxb201412262581
典型胞外呼吸细菌的胞内电子转移机制研究进展
Intracellular electron transfer mechanism of typical extracellular respiratory bacteria
摘要
Abstract
The reduction of humus and metals such as Fe and Mn is a challenge for microorganisms,as these substances have low water solubility and cannot enter into cell envelopes.Extracellular electron transfer is defined as the process through which electrons derived from the oxidation of electron donors are transferred from the inner membrane to the outer membrane of the cell to reduce an extracellular terminal electron acceptor.S.oneidensis MR-1 and G.sulfurreducens are the most frequently used organisms for extracellular respiratory bacteria experiments because they have developed electron transfer strategies that require mutiheme c-type cytochromes (c-Cyts).In S.oneidensis MR-1,multiheme c-Cyts,CymA,and MtrA are believed to transfer electrons from the inner membrane qunione/quinol pool through the periplasm to the outer membrane (OmcA,MtrC).The Type Ⅱ secretion system of S.oneidensis MR-1 was due to the direct involvement of translocation of MtrC and OmcA to the bacterial cell surface.The decaheme c-Cyts,MtrC,and OmcA can directly reduce the extracellular electron acceptors.Likewise,for G.sulfurreducens,MacA delivered electrons from the inner membrane to PpcA in periplasm,and PpcA subsequently transferred electrons to the OMCs (OmcB,OmcE,OmcS,and OmcZ) and Type Ⅳ pili that were hypothesized to relay the electrons to extracellular electron acceptors.This review summarizes the recent advances of extracellular electron transfer mechanisms with a focus on Shewanella and Geobacter.关键词
胞外呼吸/胞内电子转移/Shewanella/GeobacterKey words
extracellular respiration/intracellular electron transfer/Shewanella/Geobacter引用本文复制引用
赵昕宇,何小松,檀文炳,高如泰,席北斗,李丹,张慧..典型胞外呼吸细菌的胞内电子转移机制研究进展[J].生态学报,2017,37(8):2540-2550,11.基金项目
国家杰出青年科学基金项目(51325804) （51325804）
国家自然科学青年基金项目(51408573) （51408573）
