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- W4310171915 abstract "We report total internal reflection (TIR)-Raman spectroscopy to study intermolecular interactions between membrane-binding peptides and lipid bilayer membranes. The method was applied to alamethicin (ALM), a model peptide for channel proteins, interacting with 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) bilayer membranes at a silica/water interface. After a dimethyl sulfoxide (DMSO) solution of ALM was added into the water subphase of the DPPC/DPPC bilayer, Raman signals in the CH stretching region increased in intensity reflecting the appearance of the Raman bands due to ALM and DMSO. To identify ALM-dependent spectral changes, we removed DPPC and DMSO contributions from the Raman spectra. We first subtracted the spectrum of the DPPC bilayer from those after the addition of the ALM solution. The contribution of DMSO was then removed by subtracting a DMSO spectrum from the resultant spectra. The DMSO spectrum was obtained in a similar way from a control experiment where DMSO alone was added into the subphase. With the use of this double difference approach, the ALM-dependent changes were successfully obtained. Experiments with DPPC bilayers with deuterated acyl chains revealed that most of the spectral change observed after the addition of ALM was due to the vibrational bands of ALM, not originated from ALM-induced conformational changes of the lipid bilayers." @default.
- W4310171915 created "2022-11-30" @default.
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- W4310171915 date "2022-12-22" @default.
- W4310171915 modified "2023-10-18" @default.
- W4310171915 title "Total Internal Reflection Raman Spectra of Alamethicin Interacting with Supported Lipid Bilayers at a Silica/Water Interface." @default.
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- W4310171915 doi "https://doi.org/10.1021/acs.jpcb.2c06371" @default.
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