Cytochrome-mediated direct electron uptake from metallic iron by Methanosarcina acetivorans  

作　　者：Dawn E.Holmes Haiyan Tang Trevor Woodard Dandan Liang Jinjie Zhou Xinying Liu Derek R.Lovley 

机构地区：[1]Department of Microbiology,University of Massachusetts-Amherst,Amherst,Massachusetts,USA [2]Department of Physical and Biological Science,Western New England University,Springfield,Massachusetts,USA [3]Jiangsu Provincial Key Lab of Solid Organic Waste Utilization,Jiangsu Collaborative Innovation Center of Solid Organic Wastes,Educational Ministry Engineering Center of Resource-saving Fertilizers,Nanjing Agricultural University,Nanjing,China [4]State Key Laboratory of Urban Water Resource and Environment,School of Environment,Harbin Institute of Technology,Harbin,China [5]Institute for Advanced Study,Shenzhen University,Shenzhen,Guangdong,China [6]College of Environmental Science and Engineering,Beijing Forestry University,Beijing,China

出　　处：《mLife》2022年第4期443-447,共5页微生物（英文）

摘　　要：Impact statement Methane-producing microorganisms accelerate the corrosion of iron-containing metals.Previous studies have inferred that some methanogens might directly accept electrons from Fe(0),but when this possibility was more intensively investigated,H2 was shown to be an intermediary electron carrier between Fe(0)and methanogens.Here,we report that Methanosarcina acetivorans catalyzes direct metal-to-microbe electron transfer to support methane production.Deletion of the gene for the multiheme,outer-surface c-type cytochrome MmcA eliminated methane production from Fe(0),consistent with the key role of MmcA in other forms of extracellular electron exchange.These findings,coupled with the previous demonstration that outer-surface c-type cytochromes are also electrical contacts for electron uptake from Fe(0)by Geobacter and Shewanella species,suggest that the presence of multiheme c-type cytochromes on corrosion surfaces might be diagnostic for direct metal-to-microbe electron transfer and that interfering with cytochrome function might be a strategy to mitigate corrosion.

关 键 词：corrosion ELECTRON outer 

分 类 号：TG14[一般工业技术—材料科学与工程]