Abstract
Modelin-5-CONH2, a synthetic antimicrobial peptide, was used to gain an insight into species-selective haemolytic activity. The peptide displayed limited haemolytic activity against sheep (12 %), human (2 %), and pig (2 %) erythrocytes. Our results show that Modelin-5-CONH2 had a disordered structure in the presence of vesicles formed from sheep, human, and pig erythrocyte lipid extract (<26 % helical) yet folded to form helices in the presence of a phosphatidylcholine (PC) membrane interface (e.g. >42 % in the presence of 1,2-dimyristoyl-sn-glycero-3-phosphocholine). Monolayer studies showed a strong correlation between anionic lipid content and monolayer insertion and lysis inducing surface pressure changes of 9.17 mN m−1 for 1,2-dimyristoyl-sn-glycero-3-phospho-l-serine compared with PC monolayers, which induced pressure changes of ca. 3 mN m−1. The presence of cholesterol in the membrane is shown to increase the packing density as the PC:sphingomyelin (SM) ratio increases so preventing the peptide from forming a stable association with the membrane. The data suggests that the key driver for membrane interaction for Modelin-5-CONH2 is the anionic lipid attraction. However, the key factors in the species-specific haemolysis level for this peptide are the differing packing densities which are influenced by the SM:PC:cholesterol ratio.
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Dennison, S.R., Phoenix, D.A. Susceptibility of sheep, human, and pig erythrocytes to haemolysis by the antimicrobial peptide Modelin 5. Eur Biophys J 43, 423–432 (2014). https://doi.org/10.1007/s00249-014-0974-9
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DOI: https://doi.org/10.1007/s00249-014-0974-9