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Improved production of RNA-inhibiting antimicrobial peptide by Bacillus licheniformis MCC 2514 facilitated by a genetic algorithm optimized medium

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Abstract

One of the significant challenges during the purification and characterization of antimicrobial peptides (AMPs) from Bacillus sp. is the interference of unutilized peptides from complex medium components during analytical procedures. In this study, a semi-synthetic medium was devised to overcome this challenge. Using a genetic algorithm, the production medium of AMP is optimized. The parent organism, Bacillus licheniformis MCC2514, produces AMP in very small quantities. This AMP is known to inhibit RNA biosynthesis. The findings revealed that lactose, NH4Cl and NaNO3 were crucial medium constituents for enhanced AMP synthesis. The potency of the AMP produced was studied using bacterium, Kocuria rhizophila ATCC 9341. The AMP produced from the optimized medium was eightfold higher than that produced from the unoptimized medium. Furthermore, activity was increased by 1.5-fold when cultivation conditions were standardized using the optimized medium. Later, AMP was produced in a 5 L bioreactor under controlled conditions, which led to similar results as those of shake-flask production. The mode of action of optimally produced AMP was confirmed to be inhibition of RNA biosynthesis. Here, we demonstrate that improved production of AMP is possible with the developed semi-synthetic medium recipe and could help further AMP production in an industrial setup.

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The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

The authors would like to thank Director, CSIR- Central Food Technological Research Institute, for encouraging and providing the facility. The authors acknowledge the Department of Science and Technology, New Delhi, for funding the project (sanction no. EEQ/2016/000310) under which the work was carried out. IJP acknowledges ICMR, New Delhi for the grant of SRF (2019-6295) for financial support. The authors are thankful to Mr. Punil Kumar and Mr. Mukund for their technical support in carrying out the work.

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  1. Microbiology & Fermentation Technology Department, CSIR-Central Food Technological Research Institute, Mysore, Karnataka, India

    Ishrat Jahan Peerzade, Sarma Mutturi & Prakash M. Halami

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  1. Ishrat Jahan Peerzade
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IJP: conceptualization, methodology, investigation, writing—original draft. SM: software, methodology, validation, writing—review and editing. PMH: resources, validation, supervision and final approval of manuscript.

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Correspondence to Prakash M. Halami.

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Peerzade, I.J., Mutturi, S. & Halami, P.M. Improved production of RNA-inhibiting antimicrobial peptide by Bacillus licheniformis MCC 2514 facilitated by a genetic algorithm optimized medium. Bioprocess Biosyst Eng (2024). https://doi.org/10.1007/s00449-024-02998-2

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