Abstract
The interaction between two peptides previously selected by phage display to target apoptotic cells and phospholipidic models of these cells (liposomes or micelles made of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) and/or 1,2-dipalmitoyl-sn-glycero-3-phospho-l-serine (DPPS, phosphatidylserine analog) was studied by the simple analysis of the changes induced on the proton NMR chemical shifts of the peptides. Our approach which does not need healthy and/or apoptotic cells for assessing the affinity of different peptides is fast and efficient and requires small amounts of peptide to determine the association constant, the interacting protons, and the number of interaction sites. The micellar model gave more reliable results than the liposomal one. The preferential interaction of the peptide with DPPS was evidenced by the change of the chemical shifts of specific amino acids of the peptides. Our micellar model is thus well suited to mimic apoptotic cells.
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Acknowledgments
This work was supported by the Walloon Region (program First spin-off), the FNRS (Fonds National de la Recherche Scientifique), the UIAP VII and ARC Programs (AUWB-2010—10/15-UMONS-5) of the French Community of Belgium. The authors thank the Center for Microscopy and Molecular Imaging (CMMI, supported by the European Regional Development Fund and the Walloon Region).
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COSY spectrum of E3 peptide, COSY spectrum of E3 scramble peptide, COSY spectrum of R826 peptide, COSY spectrum of R826 scramble peptide, example of Z-average size of DPPC–DPPS (80–20 w/w) liposomes by intensity, example of Z-average size of DPPC liposomes by intensity, example of Z-average size of DPPC micelle by intensity, example of Z-average size of DPPS micelle by intensity (PDF 637 kb)
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Van Koninckxloo, A., Henoumont, C., Laurent, S. et al. NMR chemical shift study of the interaction of selected peptides with liposomal and micellar models of apoptotic cells. J Biol Inorg Chem 19, 1367–1376 (2014). https://doi.org/10.1007/s00775-014-1195-5
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DOI: https://doi.org/10.1007/s00775-014-1195-5