摘要:
Analogues of Peptaibolin, a peptaibol with antibiotic activity, incorporating alpha,alpha-dialkylglycines (Deg, Dpg, and Ac(6)c) at selected positions were synthesised by MW-SPPS and fully characterized. A control analogue incorporating L-alanine was also prepared. The native peptide and the analogues were studied by fluorescence spectroscopy for their membrane permeating activity. Small unilamellar vesicles (SUVs) of egg phosphatidylcholine/cholesterol (70:30) containing an encapsulated fluorescence probe (6-carboxyfluorescein) were used as membrane models. The assays of carboxyfluorescein release from SUVs upon peptide addition showed that Peptaibolin-Dpg and Peptaibolin-Ac(6)c are the most active peptides. These results indicate that the structure of the alpha,alpha-diallcylglycines is crucial for the membrane permeating ability of these Peptaibolin analogues. (C) 2016 Elsevier Ltd. All rights reserved.