FOOD SCIENCE ›› 0, Vol. ›› Issue (): 0-0.

• Basic Research •     Next Articles

Study on Antibacterial Mechanism of Antimicrobial Peptide Brevilaterin Combined with ε-Polylysine for Staphylococcus aureus

1, 1, 1, Zhi-Xin WANG   

  • Received:2019-10-09 Revised:2020-01-16 Online:2020-03-15 Published:2020-03-23

Abstract: Staphylococcus aureus is one common foodborne pathogenic bacterium, and the control of S. aureus is of great importance for the improvement of food safety. Thus, using S. aureus as indicator microorganism, the synergistical antibacterial mechanism of brevilaterin and ε-polylysine was investigated. The combined antibacterial mechanism was studied from the aspects of membrane proton motive force, cell membrane integrity, cell metabolism, cell ultrastructure, protein and nucleic acid synthesis. The results indicated that brevilaterin could dissipate the membrane potential, damage cell membrane integrity, result in the leakage of cell content, then enter into cells to inhibit the activity of respiratory chain dehydrogenase to inhibit S. aureus. ε-Polylysine could increase the membrane permeability, change the transmembrane proton gradient, enter into cells to degrade the protein or inhibit the synthesis of protein, and bind with DNA to inhibit the function of DNA, thereby to play the antibacterial activity. The combination of brevilaterin and ε-polylysine could synergistically damage the membrane integrity, inhibit the activity of respiratory chain dehydrogenase caused by brevilaterin, and bind with DNA due to ε-polylysine, finally to achieve multi-target synergistic antibacterial action.

Key words: Brevilaterin, ε-Polylysine, synergistic antibacterial mechanism, Staphylococcus aureus

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