Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Exogenous Indole Regulates Lipopeptide Biosynthesis in Antarctic Bacillus amyloliquefaciens Pc3

  • Ding, Lianshuai (Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration) ;
  • Zhang, Song (Center for Proteomics, State Key Laboratory of Bio-Control, School of Life Science, Sun Yat-Sen University) ;
  • Guo, Wenbin (Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration) ;
  • Chen, Xinhua (Key Laboratory of Marine Biogenetic Resources, Third Institute of Oceanography, State Oceanic Administration)
  • Received : 2017.12.06
  • Accepted : 2018.03.03
  • Published : 2018.05.28
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Abstract

Bacillus amyloliquefaciens Pc3 was isolated from Antarctic seawater with antifungal activity. In order to investigate the metabolic regulation mechanism in the biosynthesis of lipopeptides in B. amyloliquefaciens Pc3, GC/MS-based metabolomics was used when exogenous indole was added. The intracellular metabolite profiles showed decreased asparagine, aspartic acid, glutamine, glutamic acid, threonine, valine, isoleucine, hexadecanoic acid, and octadecanoic acid in the indole-treated groups, which were involved in the biosynthesis of lipopeptides. B. amyloliquefaciens Pc3 exhibited a growth promotion, bacterial total protein increase, and lipopeptide biosynthesis inhibition upon the addition of indole. Besides this, real-time PCR analysis further revealed that the transcription of lipopeptide biosynthesis genes ituD, fenA, and srfA-A were downregulated by indole with 22.4-, 21.98-, and 26.0-fold, respectively. It therefore was speculated that as the metabolic flux of most of the amino acids and fatty acids were transferred to the synthesis of proteins and biomass, lipopeptide biosynthesis was weakened owing to the lack of precursor amino acids and fatty acids.

Keywords

References

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