Structural Dependence of Extended Amide III Vibrations in Two-Dimensional Infrared Spectra
JOURNAL OF PHYSICAL CHEMISTRY LETTERS(2023)
摘要
Two-dimensional infrared (2D-IR) spectroscopy is a powerful experimental method for probing the structure and dynamics of proteins in aqueous solution. So far, most experimental studies have focused on the amide I vibrations, for which empirical vibrational exciton models provide a means of interpreting such experiments. However, such models are largely lacking for other regions of the vibrational spectrum. To close this gap, we employ an efficient quantum-chemical methodology for the calculation of 2D-IR spectra, which is based on anharmonic theoretical vibrational spectroscopy with localized modes. We apply this approach to explore the potential of 2D-IR spectroscopy in the extended amide III region. Using calculations for a dipeptide model as well as alanine polypeptides, we show that distinct 2D-IR cross-peaks in the extended amide III region can potentially be used to distinguish alpha-helix and beta-strand structures. We propose that the extended amide III region could be a promising target for future 2D-IR experiments.
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关键词
extended amide iii vibrations,infrared spectra,two-dimensional
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