产电微生物Shewanella菌厌氧呼吸代谢网络研究进展

Metabolic networks of electricigens Shewanella for anaerobic respiration

以模式菌株Shewanella oneidensis MR-1为代表的Shewanella菌属产电微生物广泛分布于自然水体环境中。作为兼性厌氧菌,Shewanella菌除了能进行有氧呼吸外,还能利用多种电子受体进行厌氧呼吸。通过多种细胞色素所组成的复杂电子传递网络,Shewanella菌不仅能利用渗入到周质空间的可溶性电子受体进行厌氧呼吸,更为特殊的是其能够借助电子的跨膜传递实现对胞外不溶性电子受体的异化还原代谢。本文概述了近年来Shewanella菌厌氧代谢途径的研究进展,探讨电子传递网络对Shewanella菌呼吸多样性及环境适应性的影响。

Shewanella oneidensis MR-1 is a model strain of electricigens Shewanella, which are widely distributed in natural water environments. As a facultative anaerobic bacterium, Shewanella is capable of using a multitude of electron acceptors to anaerobic respiration. Through the complex electron transport network composed by diverse cytochromes, Shewanella can not only reduce soluble electron acceptors permeating the periplasm, but also utilize insoluble electron acceptors extracellularly via transmembrane electron conduit. Here, this paper provides an overview of recent progress in the study about anaerobic metabolic pathways of Shewanella and is helpful for exploring the importance of electronic delivery network to the respiratory diversity and environmental adaptability of Shewanella.