细菌胞际电子转移及其生态生理学意义研究进展

doi:10.13287/j.1001-9332.201902.034

摘要/Abstract

摘要： 胞际电子转移是指细胞内电子以间接或直接的方式传递到细胞外,最终到达细胞周围电子受体的过程.胞际电子转移普遍存在于自然界,尤其存在于电子受体相对匮乏的环境中.胞际电子转移可分为间接和直接胞际电子转移.间接胞际电子转移(胞际基质转移)是主要借助氢、甲酸以及其他代谢产物的电子传递;而直接胞际电子转移则由胞内电子转移偶联胞外电子传递实现.胞际电子转移促进了细胞的基质代谢活性,拓展了细胞的作用空间,具有重要的生理意义.胞际电子转移产生了电流,实现了菌间能源共享,驱动了胞外物质(如重金属、腐殖质)转化,具体重大的生态意义.本文总结相关文献,对细菌胞际电子转移的过程、特点、机理及其生态生理学意义作了系统的分析和探讨.

关键词: 电子转移机制, 胞际基质转移, 胞际电子转移, 生态生理学意义, 胞际氢/甲酸转移

Abstract: Intercellular electron transfer (IET) refers to the process within which electrons being indirectly or directly transferred to the exterior of cells and eventually delivered to the electron acceptors around cells. IET widely exists in nature, especially when electron acceptor are deficient. IET can be divided into two categories: indirect IET and direct IET. Indirect IET (intercellular substrate transfer) always occurs with electron transfer of hydrogen, formate, and other metabolites. Direct intracellular electron transfer is achieved by the coupling of intracellular and extracellular electron transfer. IET boosts the activity of cellular substrate metabolism and expands the acting space of cells. Moreover, IET generates electric current which provides driving-power for energy sharing between bacteria and transformation of extracellular material (such as heavy metals and humus). There is no doubt that IET has physiological and ecological significance. This review summarized recent advances, making a systematic analysis of the process, characteristics, mechanism and eco-physiological significance of IET.

Key words: intracellular substrate transfer, intercellular electron transfer, eco-physiological significance., intercellular hydrogen/formate transfer, electron transfer mechanism

陈文达,倪微琪,胡宝兰,郑平. 细菌胞际电子转移及其生态生理学意义研究进展[J]. 应用生态学报, 2019, 30(2): 694-702.

CHEN Wen-da, NI Wei-qi, HU Bao-lan, ZHENG Ping. Intercellular electron transfer and its eco-physiological significance: A review.[J]. Chinese Journal of Applied Ecology, 2019, 30(2): 694-702.

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