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. 2019 Mar 1;9:3257. doi: 10.1038/s41598-019-40125-4

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fluorescence emission spectra of DT-P1 (a), DT-P2 (b) and E1 peptide (c) upon titration with POPC unilamellar vesicles. Black solid line represents 5 µM peptide in HEPES buffer; grey and dotted lines corresponds to peptide titration with POPC LUVs at a concentration ranged from 0.05 mM to 0.6 mM; (d) Partitioning isotherms of E1 and DT-peptides estimated from the fractional change in Trp fluorescence intensity upon addition of increasing amounts of liposomes. Binding experiments were done by triplicate. Values of apparent mole fraction partition coefficients were: K_X = 2.4 × 10⁵ and K_X = 8.2 × 10⁵ for DT-P2 and E1 peptide, respectively.