Release of aqueous contents from phospholipid vesicles induced by cecropin A (1-8)-magainin 2 (1-12) hybrid and its analogues

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Title
Release of aqueous contents from phospholipid vesicles induced by cecropin A (1-8)-magainin 2 (1-12) hybrid and its analogues
Author(s)
J H Kang; Song Yub Shin; So Youn Jang; Myung Kyu Lee; Kyung Soo Hahm
Bibliographic Citation
Chemical Biology & Drug Design, vol. 52, pp. 45-50
Publication Year
1998
Abstract
The membrane-disrupting properties of cecropin A (1-8)-magainin 2 (1- 12) hybrid peptide, which has higher antitumor with less hemolytic activities than cecropin A (1-8)melittin (1-12), and its analogues were assessed by measuring the induced release of vesicle-entrapped fluorescence probes. A model membrane was made of zwitterionic phospholipid (phosphatidylcholine) or the mixture of negatively and zwitterionic phospholipids (phosphatidylcholine and phosphatidylserine). The extent of leakage of the aqueous content of the phospholipid vesicles was found to have remarkable discrepancies according to the amphipathic nature of each analogue peptide. The entrapped high molecular weight solute (fluorescein-labeled immunoglobulin G, 55 kDa) also was released by the analogue which had the largest hydrophobic region and the highest amphipathic score among peptides tested. As the result of the determination of the relationships between the membrane-disrupting properties and the hydrophobicity values of peptides, it was found that the membrane- disrupting activity increased according to increasing the hydrophobicity of the peptide. The tryptophan fluorescence emission spectra and CD spectra showed that on interaction with the phospholipid vesicle, the peptide acquired the ordered structure and α-helical conformation by moving a tryptophan residue into the nonpolar environment of the phospholipid vesicle. These results suggest that the breakdown of the lipid bilayer was mediated by the α-helical amphipathic structure of the peptide interacting with the lipid bilayers as well as the by the hydrophobicity of the peptide.
Keyword
circular dichroismfluorescence spectrahybrid peptidesphospholipid vesicle-disrupting activities
ISSN
1397-002X
Publisher
Wiley
DOI
http://dx.doi.org/10.1111/j.1399-3011.1998.tb00651.x
Type
Article
Appears in Collections:
1. Journal Articles > Journal Articles
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