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Design of stable antimicrobial peptides through hydrocarbon stapling
Chapuis, Hubert Jean ; Slaninová, Jiřina ; Monincová, Lenka ; Bednárová, Lucie ; Čeřovský, Václav
From the venom of wild bee Lasioglossum laticeps we have recently isolated novel antimicrobial peptides named lasioglossins. One of them, LL-III (VNWKKILGKIIKVVK-NH2), is an amphipathic α-helical peptide which shows strong antimicrobial properties and a low hemolytic activity. We anticipated that the incorporation of an all-hydrocarbon staple (bridge) into the LL-III sequence could increase its propensity to form an α-helix and lead to an improvement of its proteolytic stability as well as increase the antimicrobial activity. LL-III analogs featuring olefinic side chains in various positions were prepared by solid phase peptide synthesis. Ring closing olefin metatheses catalyzed by Grubbs-I catalyst were carried out on the solid support, either between i and i+4 positions or between i and i+7 positions.

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