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The Quorum Quenching Bacterium Bacillus licheniformis T-1 Protects Zebrafish against Aeromonas hydrophila Infection

  • Biao Chen
  • Mengfan Peng
  • Wentao Tong
  • Qinghua Zhang
  • Zengfu SongEmail author
Article
  • 19 Downloads

Abstract

Quorum sensing, bacterial cell-to-cell communication via small signaling molecules regulates virulence in many bacterial pathogens, and is a promising target for antivirulence therapy, which may inhibit virulence rather than cell growth and division. Herein, Bacillus strains capable of degrading QS molecules from freshwater environments were screened as potential aquaculture probiotics. A total of 34 Bacillus strains were isolated. Strain T-1 was selected with “H” streaking and double layer agar plate methods using Chromabacterium violaceum ATCC12472 as reporter, and eventually identified as Bacillus licheniformis based on biochemical and molecular identification. Quorum quenching by T-1 was confirmed using C. violaceum CV026. T-1 was non-hemolytic in vitro. In biocontrol experiments, T-1 reduced the pathogenicity of Aeromonas hydrophila cb15 in zebrafish co-injected intraperitoneally with both strains, achieving a relative percentage survival of 70%. Determination and analysis of the T-1 draft genome using the Illumina Hiseq 2500 platform identified the quorum quenching gene ytnP, encoding an acyl-homoserine lactone metallo-β-lactamase, as a potential QS quencher in T-1. In conclusion, B. licheniformis T-1 could be a safe and effective quorum quenching bacterium for protecting hosts against pathogenic bacterial infections in aquaculture.

Keywords

Quorum quenching Bacillus licheniformis Aeromonas hydrophila Zebrafish ytnP 

Notes

Acknowledgments

This work was supported by the Innovation Fund of Nanjing Government Jiangsu Province, China.

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.National Demonstration Center for Experimental Fisheries Science EducationShanghai Ocean UniversityShanghaiPeople’s Republic of China
  2. 2.National Pathogen Collection for Aquatic AnimalsShanghai Ocean UniversityShanghaiChina
  3. 3.Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of EducationShanghai Ocean UniversityShanghaiChina

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