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  • Title: Evidence for the formation of symmetric and asymmetric DLPC-DAPC lipid bilayer domains.
    Author: Ritter M, Schmidt S, Jakab M, Paulmichl M, Henderson R.
    Journal: Cell Physiol Biochem; 2013; 32(1):46-52. PubMed ID: 23867833.
    Abstract:
    BACKGROUND/AIMS: We investigated if mixtures of the phosphatidylcholine (PC) lipids 1,2-dilauroyl-sn-glycero-3-phosphocholine (C12:0 PC; DLPC) and 1,2-diarachidoyl-sn-glycero-3-phosphocholine (C20:0 PC; DAPC), which differ by eight methylene groups in acyl chain length, lead to the spontaneous formation of distinct lipid rafts and asymmetric bilayers. METHODS: The experiments were performed using Atomic Force Microscopy (AFM). RESULTS: We show that DLPC and DAPC mixed at a molar ratio of 1:1 lead to the formation of single, double and triple bilayers with peaks at 6.14 ± 0.11, 13.27 ± 0.17 and 20.54 ± 0.46 nm, respectively (n=750). Within these formations discrete height steps of 0.92 nm can be resolved (n=422). CONCLUSION: The most frequently observed height steps value of 0.92 nm matches best with the calculated mean lipid hydrophobic thickness difference for asymmetric C12:0 PC and C20:0 PC lipid bilayers of 0.88 nm. This indicates the ability of DLPC and DAPC to form asymmetric lipid bilayers.
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