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• W2133364694 abstract "Understanding the detailed mechanism of protein folding requires dynamic, site-specific stereochemical information. The short time response of vibrational spectroscopies allows evaluation of the distribution of populations in rapid equilibrium as the peptide unfolds. Spectral shifts associated with isotopic labels along with local stereochemical sensitivity of vibrational circular dichroism (VCD) allow determination of the segment sequence of unfolding. For a series of alanine-rich peptides that form alpha-helices in aqueous solution, we used isotopic labeling and VCD to demonstrate that the alpha-helix noncooperatively unwinds from the ends with increasing temperature. For these blocked peptides, the C-terminal is frayed at 5 degrees C. Ab initio level theoretical simulations of the IR and VCD band shapes are used to analyze the spectra and to confirm the conformation of the labeled components. The VCD signals associated with the labeled residues are amplified by coupling to the nonlabeled parts of the molecule. Thus small labeled segments are detectable and stereochemically defined in moderately large peptides in this report of site-specific peptide VCD conformational analysis." @default.
• W2133364694 created "2016-06-24" @default.
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• W2133364694 date "2000-07-04" @default.
• W2133364694 modified "2023-10-03" @default.
• W2133364694 title "Site-specific conformational determination in thermal unfolding studies of helical peptides using vibrational circular dichroism with isotopic substitution" @default.
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• W2133364694 doi "https://doi.org/10.1073/pnas.140161997" @default.
• W2133364694 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/26945" @default.
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