Desulfovibrio vulgaris as a model microbe for the study of corrosion under sulfate-reducing conditions  

作　　者：Toshiyuki Ueki Derek R.Lovley 

机构地区：[1]Key Laboratory for Anisotropy and Texture of Materials,Ministry of Education,Electrobiomaterials Institute,Northeastern University,Shenyang,China [2]Department of Microbiology University of Massachusetts,Amherst,MA,USA.

出　　处：《mLife》2022年第1期13-20,共8页微生物（英文）

摘　　要：Corrosion of iron-containing metals under sulfate-reducing conditions is an economically important problem.Microbial strains now known as Desulfovibrio vulgaris served as the model microbes in many of the foundational studies that developed existing models for the corrosion of iron-containing metals under sulfate-reducing conditions.Proposed mechanisms for corrosion by D.vulgaris include:(1)H2 consumption to accelerate the oxidation of Fe0 coupled to the reduction of protons to H2;(2)production of sulfide that combines with ferrous iron to form iron sulfide coatings that promote H2 production;(3)moribund cells release hydrogenases that catalyze Fe0 oxidation with the production of H2;(4)direct electron transfer from Fe0 to cells;and(5)flavins serving as an electron shuttle for electron transfer between Fe0 and cells.The demonstrated possibility of conducting transcriptomic and proteomic analysis of cells growing on metal surfaces suggests that similar studies on D.vulgaris corrosion biofilms can aid in identifying proteins that play an important role in corrosion.Tools for making targeted gene deletions in D.vulgaris are available for functional genetic studies.These approaches,coupled with instrumentation for the detection of low concentrations of H2,and proven techniques for evaluating putative electron shuttle function,are expected to make it possible to determine which of the proposed mechanisms for D.vulgaris corrosion are most important.

关 键 词：CORROSION DESULFOVIBRIO electron shuttle extracellular electron transfer Fe0 oxidation HYDROGENASE hydrogen uptake sulfate reduction sulfide 

分 类 号：Q93[生物学—微生物学]