Abstract
Polymyxins are cationic antimicrobial peptides used as the last-line therapy to treat multidrug-resistant Gram-negative bacterial infections. The bactericidal activity of polymyxins against Gram-negative bacteria relies on the electrostatic interaction between the positively charged polymyxins and the negatively charged lipid A of lipopolysaccharide (LPS). Given that Gram-positive bacteria lack an LPS-containing outer membrane, it is generally acknowledged that polymyxins are less active against Gram-positive bacteria. However, Gram-positive bacteria produce negatively charged teichoic acids, which may act as the target of polymyxins. More and more studies suggest that polymyxins have potential as a treatment for Gram-positive bacterial infection. This mini-review discusses recent advances in the mechanism of the antibacterial activity and resistance of polymyxins in Gram-positive bacteria.
Key Points | |
• Teichoic acids play a key role in the action of polymyxins on Gram-positive bacteria. | |
• Polymyxin kills Gram-positive bacteria by disrupting cell surface and oxidative damage. | |
• Modification of teichoic acids and phospholipids contributes to polymyxin resistance in Gram-positive bacteria. | |
• Polymyxins have potential as a treatment for Gram-positive bacterial infection. |
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YJ and YZ conceived and designed the review. CD, FJ, and LY collected the data. YJ, MQ, LQ, and YZ wrote the manuscript. All authors read and approved the manuscript.
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This research was supported by the grants from Zhejiang Provincial Natural Science Foundation of China (LY20C010003), National Natural Science Foundation of China (31670114), and the National Key R&D Program of China (2017YFC1600100).
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Yin, J., Meng, Q., Cheng, D. et al. Mechanisms of bactericidal action and resistance of polymyxins for Gram-positive bacteria. Appl Microbiol Biotechnol 104, 3771–3780 (2020). https://doi.org/10.1007/s00253-020-10525-y
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DOI: https://doi.org/10.1007/s00253-020-10525-y