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• W4380563822 abstract "Time-resolved fluorescence spectroscopy in combination with differential scanning calorimetry (DSC) was used to study the chemical interactions that occur when l-phenylalanine is introduced to solutions containing phosphatidylcholine vesicles. Studies reported in this work address open questions about l-Phe’s affinity for lipid vesicle bilayers, the effects of l-Phe partitioning on bilayer properties, l-Phe’s solvation within a lipid bilayer, and the amount of l-Phe within that local solvation environment. DSC data show that l-Phe reduces the amount of heat necessary to melt saturated phosphatidylcholine bilayers from their gel to liquid-crystalline state but does not change the transition temperature (Tgel-lc). Time-resolved emission shows only a single l-Phe lifetime at low temperatures corresponding to l-Phe remaining solvated in aqueous solution. At temperatures close to Tgel-lc, a second, shorter lifetime appears that is assigned to l-Phe already embedded within the membrane that becomes hydrated as water starts to permeate the lipid bilayer. This new lifetime is attributed to a conformationally restricted rotamer in the bilayer’s polar headgroup region and accounts for up to 30% of the emission amplitude. Results reported for dipalmitoylphosphatidylcholine (DPPC, 16:0) lipid vesicles prove to be general, with similar effects observed for dimyristoylphosphatidylcholine (DMPC, 14:0) and distearoylphosphatidylcholine (DSPC, 18:0) vesicles. Taken together, these results create a complete and compelling picture of how l-Phe associates with model biological membranes. Furthermore, this approach to examining amino acid partitioning into membranes and the resulting solvation forces points to new strategies for studying the structure and chemistry of membrane-soluble peptides and selected membrane proteins." @default.
• W4380563822 created "2023-06-14" @default.
• W4380563822 creator A5017764387 @default.
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• W4380563822 date "2023-06-14" @default.
• W4380563822 modified "2023-10-17" @default.
• W4380563822 title "<scp>l</scp>-Phenylalanine Partitioning Mechanisms in Model Biological Membranes" @default.
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• W4380563822 doi "https://doi.org/10.1021/acs.jpcb.2c08582" @default.
• W4380563822 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37315336" @default.
• W4380563822 hasPublicationYear "2023" @default.
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