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Spontaneous charged lipid transfer between lipid vesicles

Research output: Contribution to journalJournal article

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  • Joanna L. Richens
  • Arwen I.I. Tyler
  • Hanna M.G. Barriga
  • Jonathan P. Bramble
  • Robert V. Law
  • Nicholas J. Brooks
  • John M. Seddon
  • Oscar Ces
  • Paul O'Shea
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Article number12606
<mark>Journal publication date</mark>3/10/2017
<mark>Journal</mark>Scientific Reports
Volume7
Number of pages10
Publication statusPublished
Original languageEnglish

Abstract

© 2017 The Author(s). An assay to study the spontaneous charged lipid transfer between lipid vesicles is described. A donor/acceptor vesicle system is employed, where neutrally charged acceptor vesicles are fluorescently labelled with the electrostatic membrane probe Fluoresceinphosphatidylethanolamine (FPE). Upon addition of charged donor vesicles, transfer of negatively charged lipid occurs, resulting in a fluorescently detectable change in the membrane potential of the acceptor vesicles. Using this approach we have studied the transfer properties of a range of lipids, varying both the h eadgroup and the chain length. At the low vesicle concentrations chosen, the transfer follows a first-order process where lipid monomers are transferred presumably through the aqueous solution phase from donor to acceptor vesicle. The rate of transfer decreases with increasing chain length which is consistent with energy models previously reported for lipid monomer vesicle interactions. Our assay improves on existing methods allowing the study of a range of unmodified lipids, continuous monitoring of transfer and simplified experimental procedures.