Abstract
Quorum sensing, the microbial communication system, is gaining importance as a therapeutic target against pathogens. The two key reasons for the rising demand of quorum sensing (QS) inhibitory molecules are low selective pressure to develop resistance by pathogens and possibility of more species-specific effects. Due to complex interactions in a unique niche of live plant tissues, endophytes, as a survival mechanism, potentially produce various bioactive compounds such as QS inhibitors. We report the isolation of an endophytic fungus Kwoniella sp. PY016 from the medicinal plant “Bahera” (Terminalia bellirica), which exhibits substantial quorum sensing inhibition and anti-biofilm activities against the standard test organism, Chromobacterium violaceum. Sugar, sugar alcohol, carboxylic acid, lipid, and phenolic classes of metabolites (predominantly xylitol) are responsible components of the metabolome for the desired bioactivity. A judicious combination of single-factor-at-a-time strategy and artificial neural network modeling combined with genetic algorithm was employed for the selection and optimization of the critical process and medium parameters. Through this newly adopted hybrid model-based optimization, the quorum sensing inhibitory activity of the endophytic metabolome was increased by ~ 30%. This is the first report on optimization of QS inhibitory activity from any fungal endophyte using such a hybrid advanced approach.
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Acknowledgments
The authors wish to acknowledge Ms. Mohor Mitra for critical reading of the manuscript. A.M. thanks MHRD, Govt. of India, for providing fellowship. We acknowledge the Central Research Facility of IIT Kharagpur for extending the use of Zeiss EVO 60 scanning electron microscope.
Funding
Grant supports from SGIRG-SRIC (IIT/SRIC/BT/GRT/2014) and Food Security Project (F. No. 4-25/2013-TS-1) of IIT Kharagpur for developing research infrastructure are acknowledged.
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Mookherjee, A., Dineshkumar, R., Kutty, N.N. et al. Quorum sensing inhibitory activity of the metabolome from endophytic Kwoniella sp. PY016: characterization and hybrid model-based optimization. Appl Microbiol Biotechnol 102, 7389–7406 (2018). https://doi.org/10.1007/s00253-018-9168-1
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DOI: https://doi.org/10.1007/s00253-018-9168-1