Abstract
Plantaricin NC8, a two-peptide non-lantibiotic class IIb bacteriocin composed of PLNC8α and PLNC8β and derived from Lactobacillus plantarum ZJ316, has been shown to be highly potent against a range of bacteria and fungi. In this study, we assessed the antimicrobial mechanism of plantaricin NC8 against the most sensitive bacterial strain, Micrococcus luteus CGMCC 1.193. The results showed that plantaricin NC8 induced membrane permeabilization and caused cell membrane disruption to M. luteus CGMCC 1.193 cells, as evidenced by electrolyte efflux, loss of proton motive force, and ATP depletion within a few minutes of plantaricin NC8 treatment. Furthermore, scanning and transmission electron microscopy showed that plantaricin NC8 had a drastic impact on the structure and integrity of M. luteus CGMCC 1.193 cells. In addition, we found that either PLNC8α or PLNC8β alone exhibited membrane permeabilization activity, but that PLNC8β had higher permeabilization activity, and their individual effects were not as strong as that of the combined compounds as plantaricin NC8. Finally, we showed that lipid II is not the specific target of plantaricin NC8 against M. luteus CGMCC 1.193. Our study reveals the antimicrobial mechanism of plantaricin NC8 against M. luteus CGMCC 1.193.
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Funding
This project was funded by the National Science Foundation of China (No. 31601449), Natural Science Foundation of Zhejiang Province (No. LY16C200002, No. LQ18C200004), International Science & Technology Cooperation Program of China (No. 2013DFA32330), the Major Science and Technology Projects of Zhejiang Province (2015C02039, 2015C02022), and the Food Science and Engineering—the most important discipline of Zhejiang Province (2017SIAR202).
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Jiang, H., Tang, X., Zhou, Q. et al. Plantaricin NC8 from Lactobacillus plantarum causes cell membrane disruption to Micrococcus luteus without targeting lipid II. Appl Microbiol Biotechnol 102, 7465–7473 (2018). https://doi.org/10.1007/s00253-018-9182-3
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DOI: https://doi.org/10.1007/s00253-018-9182-3