A fluorescence resonance energy transfer approach for monitoring protein-mediated glycolipid transfer between vesicle membranes

Peter Mattjus, JG Molotkovsky, JM Smaby, RE Brown

    Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

    53 Citeringar (Scopus)

    Sammanfattning

    A lipid transfer protein, purified from bovine brain (23.7 kDa, 208 amino acids) and specific for glycolipids, has been used to develop a fluorescence resonance energy transfer assay (anthrylvinyl-labeled lipids; energy donors and perylenoyl-labeled lipids; energy accepters) for monitoring the transfer of lipids between membranes. Small unilamellar vesicles composed of 1 mol% anthrylvinyl-galactosylceramide, 1.5 mol% perylenoyl-triglyceride, and 97.5% 1-palmitoyl-2-oleoyl phosphatidylcholine (POPC) served as donor membranes. Acceptor membranes were 100% POPC vesicles. Addition of glycolipid transfer protein to mixtures of donor and acceptor vesicles resulted in increasing emission intensity of anthrylvinyl-galactosylceramide and decreasing emission intensity of the nontransferable perylenoyl-triglyceride as a function of time. The behavior was consistent with anthrylvinyl-galactosylceramide being transferred from donor to acceptor vesicles. The anthrylvinyl and perylenoyl energy transfer pair offers advantages over frequently used energy transfer pairs such as NBD and rhodamine. The anthrylvinyl emission overlaps effectively the perylenoyl excitation spectrum and the fluorescence parameters of the anthrylvinyl fluorophore are nearly independent of the medium polarity. The non-polar fluorophores are localized in the hydrophobic region of the bilayer thus producing minimal disturbance of the bilayer polar region. Our results indicate that this method is suitable for assay of lipid transfer proteins including mechanistic studies of transfer protein function.
    OriginalspråkOdefinierat/okänt
    Sidor (från-till)297–304
    Antal sidor8
    TidskriftAnalytical Biochemistry
    Volym268
    Utgåva2
    StatusPublicerad - 1999
    MoE-publikationstypA1 Tidskriftsartikel-refererad

    Nyckelord

    • anthrylvinyl
    • galactosylceramide
    • glycosphingolipid
    • lipid transfer protein
    • perylenoyl
    • phospholipid bilayers

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