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. 2000 Feb;78(2):846–856. doi: 10.1016/S0006-3495(00)76642-2

Detection of peptide-lipid interactions in mixed monolayers, using isotherms, atomic force microscopy, and fourier transform infrared analyses.

V Vié 1, N Van Mau 1, L Chaloin 1, E Lesniewska 1, C Le Grimellec 1, F Heitz 1
PMCID: PMC1300687  PMID: 10653797

Abstract

To improve the understanding of the membrane uptake of an amphipathic and positively charged vector peptide, we studied the interactions of this peptide with different phospholipids, the nature of whose polar headgroups and physical states were varied. Three lipids were considered: dipalmitoylphosphatidylcholine (DPPC), dipalmitoylphosphatidylglycerol (DPPG), and dioleoylphosphatidylglycerol (DOPG). The approach was carried out by three complementary methods: compression isotherms of monolayers and atomic force microscopy observations associated with Fourier transform infrared investigations. From analysis of the compression isotherms, it was concluded that the peptide interacts with all lipids and with an expansion of the mean molecular area, implying that both components form nonideal mixtures. The expansion was larger in the case of DOPG than for DPPC and DPPG because of an alpha to beta conformational transition with an increase in the peptide molar fraction. Atomic force microscopy observations showed that the presence of small amounts of peptide led to the appearance of bowl-like particles and that an increase in the peptide amounts generated the formation of filaments. In the case of DOPG, filaments were found at higher peptide molar fractions than already observed for DOPC because of the presence of negatively charged lipid headgroups.

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Selected References

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