title: Wettability-regulated extracellular electron transfer from the living organism of Shewanella loihica PV-4.
abstract: C-type cytochromes located on the outer membrane (OMCs) of genus Shewanella act as the main redox-active species to mediate extracellular electron transfer (EET) from the inside of the outer membrane to the external environment: the central challenge that must be met for successful EET. The redox states of OMCs play a crucial role in dictating the rate and extent of EET. Here, we report that the surface wettability of the electrodes strongly influences the EET activity of living organisms of Shewanella loihica PV-4 at a fixed external potential: the EET activity on a hydrophilic electrode is more than five times higher than that on a hydrophobic one. We propose that the redox state of OMCs varies significantly at electrodes with different wettability, resulting in different EET activities.
authors.affiliation: Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-inspired Energy Materials and Devices, School of Chemistry and Environment, Beihang University, Beijing 100191 (P.R. China).
authors.forename: Chun-mei
authors.initials: CM
authors.lastname: Ding
authors.forename: Mei-ling
authors.initials: ML
authors.lastname: Lv
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhu
authors.forename: Lei
authors.initials: L
authors.lastname: Jiang
authors.forename: Huan
authors.initials: H
authors.lastname: Liu
mesh_terms: D003574:Cytochrome c Group / Q000737:chemistry / Q000378:metabolism*; D055664:Electrochemical Techniques; D004566:Electrodes; D004579:Electron Transport; D004583:Electrons; D017646:Organosilicon Compounds; D020592:Shewanella / Q000737:chemistry / Q000201:enzymology / Q000378:metabolism*; D012821:Silanes / Q000737:chemistry; D017971:Tin Compounds / Q000737:chemistry; D017155:Wettability
chemical_list: D003574:Cytochrome c Group; D017646:Organosilicon Compounds; D012821:Silanes; D017971:Tin Compounds; C109984:indium tin oxide; C102833:(3-mercaptopropyl)trimethoxysilane
keywords: cytochromes; electrochemistry; electron transfer; microbes; wettability