Synthesis of a peptide derivative of microcin J25 and evaluation of antibacterial and biological activities

Document Type : Research article

Authors

1 Department of Microbiology, Science and Research Branch, Islamic Azad University, Tehran, Iran

2 Radiation Application Research School, Nuclear Science and Technology Research Institute (NSTRI), P.O.Box: 14395-836, Tehran, Iran

3 Department of Microbiology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran

4 Department of Biology, Science and Research Branch, Islamic Azad University, Tehran, Iran.

Abstract

Microcin J25 (MccJ25) is a small ribosomally synthesized antimicrobial peptide that is produced by Enterobacteriacea family especially E.coli. The present study focuses on preparation and evaluation of in vitro antimicrobial and biological properties of a new peptide derived from MccJ25. We prepared a MccJ25-derived peptide containing 14 amino acids and a single intra-molecular disulfide bond according to solid phase synthesis strategy. The purified peptide was characterized by Liquid chromatography-mass spectrometry (LC-MS) and Fourier Transform Infrared (FTIR) spectroscopy. 96-well microdilution plate assay was exerted for determination of minimum inhibitory concentration (MIC) of peptide against different bacterial strains. Cytotoxicity of the peptide derivative on HT-29 cell line assayed using MTT test. The final peptide successfully was prepared with purity more than 99.8% as determined by analytical HPLC. The evaluation of antibacterial activity of the peptide against Gram-positive and Gram- negative bacteria revealed that the peptide was very effective against E.coli 35218 with minimum inhibitory concentration (MIC) at dose 3.9 µM. The hemolytic activity toward human erythrocytes was very minimal below 0.3 %. The cell viability percentage of HT-29 cell line after 24 hours of contact with the peptide was more than 83%. The high sensitivity of E.coli strain to this new peptide derived from MccJ25 and through minimal toxicity to cancerous cell, suggesting that above synthesized peptide could be considered as a bioactive compound for further investigations.

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Iranian Journal of Pharmaceutical Research
Volume 18, Issue 3
Summer 2019
Pages 1264-1276

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