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- W2040051782 abstract "Charged terminal groups or polar side chains of amino acids create spatially nonuniform electrostatic potential around intramolecular peptide bonds and induce amide I mode frequency shifts in polypeptides. By carrying out a series of quantum chemistry calculation studies of various ionic di- and tripeptides as well as dipeptides of 20 different amino acids, these internal field effects on vibrational properties are theoretically investigated. The amide I local and normal mode frequencies and dipole and rotational strengths determining IR and vibrational circular dichroism intensities, respectively, are found to depend on the polar nature of side chains, whereas the vibrational coupling strength weakly does so. The empirical correction and fragment analysis methods were used to theoretically calculate the amide I local mode frequencies and dipole and rotational strengths. These values were directly compared with ab initio and density functional theory calculation results, and the agreements were found to be quantitative." @default.
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- W2040051782 date "2005-02-26" @default.
- W2040051782 modified "2023-10-10" @default.
- W2040051782 title "Theoretical Study of Internal Field Effects on Peptide Amide I Modes" @default.
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- W2040051782 doi "https://doi.org/10.1021/jp0461302" @default.
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