首页|Effect of exogenous flavins on the microbial corrosion by Geobacter sulfurreducens via iron-to-microbe electron transfer

Effect of exogenous flavins on the microbial corrosion by Geobacter sulfurreducens via iron-to-microbe electron transfer

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Microbes can cause or accelerate metal corrosion,leading to huge losses in corrosion damages each year.Geobacter sulfurreducens is a representative electroactive bacterium in many soils,sediments,and wastew-ater systems.It has been confirmed to directly extract electrons from elemental metals.However,little is known about the effect of electron shuttles in G.sulfurreducens corrosion on stainless steel.In this study,we report that exogenous flavins promote iron-to-microbe electron transfer,accelerating micro-bial corrosion.G.sulfurreducens caused 1.3 times deeper pits and increased electron uptake(with 2 times increase of icorr)from stainless steel when riboflavin was added to the culture medium.OmcS-deficient mutant data suggest that G.sulfurreducens utilizes riboflavin as a bound-cofactor in outer membrane c-type cytochromes.The finding that,in the presence of microbes,riboflavin can substantially accelerate corrosion highlights the role of flavin redox cycling for enhanced iron-to-microbe electron transfer by G.sulfurreducens and provides new insights in microbial corrosion.

Extracellular electron transferMicrobiological corrosionGeobacter sulfurreducensOuter membrane c-type cytochromesExogenous flavins

Yuting Jin、Jiaqi Li、Mingxing Zhang、Borui Zheng、Dake Xu、Tingyue Gu、Fuhui Wang

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Shenyang National Laboratory for Materials Science,Northeastern University,Shenyang 110819,China

Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),Northeastern University,Shenyang 110819,China

Department of Chemical and Biomolecular Engineering,Institute for Corrosion and Multiphase Technology,Ohio University,Athens OH 45701,USA

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Key Research and Development Program of ChinaFundamental Research Funds for the Central Universities of the Ministry of Education of ChinaFundamental Research Funds for the Central Universities of the Ministry of Education of ChinaLiaoning Revitalization Talents Program

52101078U20062192020YFA0907300N2102009N2002019XLYC1907158

2024

10.1016/j.jmst.2023.06.014

材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.171(4)
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