Stearic acid spin labels in lipid bilayers :  insight through atomistic simulations

L.M. Stimson, L. Dong, M.E.J. Karttunen, A. Wisniewska, M. Dutka, T. Róg

    Research output: Contribution to journalArticleAcademicpeer-review

    21 Citations (Scopus)

    Abstract

    Spin-labeled stearic acid species are commonly used for electron paramagnetic resonance (EPR) studies of cell membranes to investigate phase transitions, fluidity, and other physical properties. In this paper, we use large-scale molecular dynamics simulations to investigate the position and behavior of nitroxide spin labels attached to stearic acid molecules in dipalmitoylphosphatidylcholine (DPPC) bilayers. The results of these studies are potentially very important for the interpretation of EPR spectra, which rely on assumptions about the position of the label in the membrane. Additionally, we investigate the effect of chirality and ionization of the carboxyl group of the label. For a non-ionized species, we observe that spin-label molecules are even able to make flip-flop transitions between the leaflets of the bilayer. Such transitions have been previously observed only in very rare cases in molecular simulations.
    Original languageEnglish
    Pages (from-to)12447-12453
    JournalJournal of Physical Chemistry B
    Volume111
    Issue number43
    DOIs
    Publication statusPublished - 2007

    Fingerprint Dive into the research topics of 'Stearic acid spin labels in lipid bilayers :  insight through atomistic simulations'. Together they form a unique fingerprint.

    Cite this