Abstract
Sulfate-reducing bacteria (SRB) are culprits for microbiologically influenced corrosion, and biofilms are believed to play essential roles in the corrosion induced by SRB. However, little is known about the regulation of SRB biofilms. Quorum sensing signal molecules acyl-homoserine lactones (AHLs) and autoinducer-2 (AI-2) regulate biofilm formation of many bacteria. In this study, the production of AHLs and AI-2 by one SRB strain, Desulfovibrio sp. Huiquan2017, was detected, and the effect of exogenous AI-2 on bacterial biofilm formation was discussed. It was found that the cell-free supernatants of Desulfovibrio sp. Huiquan2017 induced luminescence in a ∆luxS mutant strain Vibrio harveyi BB170, indicating the production of functional AI-2 by the bacterium. In the presence of exogenous AI-2, the growth of Desulfovibrio sp. Huiquan2017 and early biofilm formation were not affected, but the later stage of biofilm development was inhibited significantly. The biofilms became looser, smaller, and thinner, and contained less bacteria and extracellular polymeric substances (EPS). The inhibition effect of AI-2 on the biofilm development of Desulfovibrio sp. Huiquan2017 was mainly achieved through reducing the amount of EPS in biofilms. These findings shed light on the biofilm regulation of SRB.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China [Grant Nmbers 51771180, 41806087, and U1906226], Key Deployment Project of Center for Ocean Mega-Research of Science, Chinese Academy of Sciences [Grant Number COMS2019Q13], and Key Projects of China National Key Research and Development Plan [Grant Number 2019YFE012026]. We thank Professor Jun Zhu, Huiming Zheng, and Li Sun for friendly providing bacterial reporter strains.
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All authors contributed to the study conception and design. Investigation, material preparation, data collection and analysis, and original draft writing were performed by Ee Li. Jiajia Wu contributed to supervision and funding acquisition. Dun Zhang contributed to project administration, supervision, and funding acquisition. All authors read and approved the final manuscript.
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Li, E., Wu, J. & Zhang, D. Exogenous autoinducer-2 inhibits biofilm development of Desulfovibrio sp. Huiquan2017. World J Microbiol Biotechnol 37, 124 (2021). https://doi.org/10.1007/s11274-021-03071-w
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DOI: https://doi.org/10.1007/s11274-021-03071-w