Exoelectrogens are distinct from other bacteria owing to their unique extracellular electron transfer (EET) abilities that allow for anaerobic respiration with various external redox-active surfaces, including electrode and metal oxides. Although the EET process is known to trigger diverse extracellular redox reactions, the reverse impact has been long overlooked. Recent evidences show that exoelectrogens can sense the potential changes of external surfaces and alter their EET strategies accordingly, which imparts them remarkable abilities in adapting to diverse and redox-variable environment. This mini-review provides a condensed overview and critical analysis about the recent discoveries on redox-dependent EET pathways of exoelectrogens, with focus on Geobacter sulfurreducens and Shewanella oneidensis. We summarize the detailed responses of various EET components, analyze the drives and mechanisms of such responses, highlight the diversity of EET dynamics among different bacterial species and under integrated effects of redox potential and surface chemistry, and discusses the future research needs.

中文翻译：

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外电原的电位依赖性细胞外电子转移途径。

外电原与其他细菌不同，因为它们具有独特的细胞外电子转移 (EET) 能力，可以通过各种外部氧化还原活性表面（包括电极和金属氧化物）进行无氧呼吸。尽管已知 EET 过程会触发多种细胞外氧化还原反应，但其反向影响长期以来一直被忽视。最近的证据表明，外电原可以感知外表面的潜在变化并相应地改变它们的 EET 策略，这赋予它们非凡的适应多样化和氧化还原变化环境的能力。这篇小型综述提供了关于外电原氧化还原依赖性 EET 途径的最新发现的简要概述和批判性分析，重点是硫还原地杆菌和 Shewanella oneidensis。