Interactions of the antimicrobial peptides temporins with model biomembranes. Comparison of temporins B and L
Abstract
Temporins are short (10-13 amino acids) and linear antimicrobial peptides first isolated from the skin of the European red frog, Rana temporaria, and are effective against Gram-positive bacteria and Candida albicans. To get insight into their mechanism(s) of action, we compared the effects on model membranes exerted by two members of this family, viz., temporin B (LLPIVGNLLKSLL-NH(2)) and temporin L (FVQWFSKFLGRIL-NH(2)). More specifically, we measured their insertion into lipid monolayers as well as their effects on the structural dynamics of liposomal bilayers as revealed by diphenylhexatriene (DPH)- and pyrene-labeled phospholipids. We also observed the impact of these peptides on the topology of giant vesicles. Both temporins readily penetrate into lipid monolayers, their intercalation being enhanced in the presence of the common bacterial negatively charged phospholipid phosphatidylglycerol. Instead, the eukaryotic lipid cholesterol did to some extent counteract their penetration into the lipid films. Both temporin B and temporin L caused an enrichment of phospholipids in the bilayers, and in the presence of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoglycerol (POPG), these peptides increased acyl chain order. Temporin B had ...Continue Reading
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