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Rationally designed PMAP-23 derivatives with enhanced bactericidal and anticancer activity based on the molecular mechanism of peptide–membrane interactions

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Abstract

Antimicrobial peptides (AMPs) are a crucial component of the natural defense system that the host employs to protect itself against invading pathogens. PMAP-23, a cathelicidin-derived AMP, has potent and broad-spectrum antimicrobial activity. Our earlier studies led us to hypothesize that PMAP-23 adopts a dynamic helix–hinge–helix structure, initially attaching to membrane surfaces through the N-helix and subsequently inserting the C-helix into the lipid bilayer. Here, we rationally designed PMAP-NC with increased amphipathicity and hydrophobicity in the N- and C-helix, respectively, based on the hypothesis of the interaction of PMAP-23 with membranes. Compared to the parental PMAP-23, PMAP-NC showed two–eightfold improved bactericidal activity against both Gram-positive and Gram-negative strains with fast killing kinetics. Fluorescence studies demonstrated that PMAP-NC largely disrupted membrane integrity, indicating that efficiency and kinetics of bacterial killing are associated with the membrane permeabilization. Interestingly, PMAP-NC exhibited much better anticancer activity against tumor cells than PMAP-23 but displayed low hemolytic activity against human erythrocytes. Collectively, our findings suggest that PMAP-NC, with the structural arrangement of an amphipathic helix–hinge–hydrophobic helix that plays a critical role in rapid and efficient membrane permeabilization, can be an attractive candidate for novel antimicrobial and/or anticancer drugs.

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Acknowledgements

This study was supported by a research fund from Chosun University (2021).

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S.S. and S.Y. designed the experiments, and H.L. conducted the experimental work. All the authors collectively assessed the results and wrote the manuscript.

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Correspondence to Sungtae Yang.

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Lee, H., Shin, SH. & Yang, S. Rationally designed PMAP-23 derivatives with enhanced bactericidal and anticancer activity based on the molecular mechanism of peptide–membrane interactions. Amino Acids 55, 1013–1022 (2023). https://doi.org/10.1007/s00726-023-03290-5

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  • DOI: https://doi.org/10.1007/s00726-023-03290-5

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