Abstract
We show that the interaction of aromatic amino acids with lipid bilayers can be characterized by conventional 1D \(^1\)H NMR spectroscopy using reference spectra obtained in isopropanol-d8/D\(_{2}\)O solutions. We demonstrate the utility of this method with three different peptides containing tyrosine, tryptophan, or phenylalanine amino acids in the presence of 1,2-dioleoyl-sn-glycero-3-phosphocholine or 1,2-dioleoyl-sn-glycero-3-phosphoserine lipid membranes. In each case, we determine an equivalent isopropanol concentration (EIC) for each hydrogen site of aromatic groups, in essence constructing a map of the chemical environment. These EIC maps provide information on relative affinities of aromatic side chains for either PC or PS bilayers and also inform on amino acid orientation preference when bound to membranes.
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Johnson, M.A., Ray, B.D., Wassall, S.R. et al. Equivalent Isopropanol Concentrations of Aromatic Amino Acids Interactions with Lipid Vesicles. J Membrane Biol 248, 695–703 (2015). https://doi.org/10.1007/s00232-015-9781-1
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DOI: https://doi.org/10.1007/s00232-015-9781-1