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• W3214935461 abstract "Circular dichroism is a conventional method for studying the secondary structures of peptides and proteins and their transitions. While certain circular dichroism features are characteristic of α-helices and β-strands, the third most abundant secondary structure, the polyproline-II helix, does not exhibit a strictly conserved spectroscopic appearance. Due to its extended nature, the polyproline-II helix is highly accessible to the surrounding solvent; thus, the environment has a critical influence on the lineshape of the circular dichroism spectra of this structure. To showcase possible effects due to the medium, in this work, we report an experimental spectroscopic study of polyproline-II-forming oligomeric peptides in various environments: solvents, detergent micelles, and liposomes. Strikingly, the examination of an oligomeric peptide in a solvent series showed a remarkable 7 nm solvatochromic shift in the main negative band starting with hexafluoropropan-2-ol and moving to hexane. Furthermore, a previously predicted positive band below 200 nm was discovered in the spectra in nonpolar environments. In isotropic liposomes, the expected transition to the transmembrane state correlated with the appearance of a positive band at 228 nm. Our results demonstrate that changes in solvation should be taken into consideration when assessing the circular dichroism spectra of peptides expected to adopt the polyproline-II conformation. Although this precaution may complicate spectral analysis, characterization of solvent-induced spectral changes can generate new opportunities for testing the location of peptides in complex systems such as micelles or lipid bilayers." @default.
• W3214935461 created "2021-12-06" @default.
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• W3214935461 date "2021-01-01" @default.
• W3214935461 modified "2023-10-03" @default.
• W3214935461 title "Remarkably high solvatochromism in the circular dichroism spectra of the polyproline-II conformation: limitations or new opportunities?" @default.
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• W3214935461 doi "https://doi.org/10.1039/d1cp04551b" @default.
• W3214935461 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34825904" @default.
• W3214935461 hasPublicationYear "2021" @default.
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