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- W4296095405 abstract "Infrared (IR) spectroscopy is a valuable tool to obtain information about protein secondary structure. The far-infrared (FIR) spectrum is characterized by a complex combination of different molecular contributions which, for small molecules, may be interpreted with the help of quantum-mechanical (QM) calculations. Unfortunately, the high computational cost of QM calculations makes them inapplicable to larger molecules, such as proteins and peptides. In this work, we present a theoretical study on the secondary structure, molecular properties, and vibrational spectra of different peptides, using both a classical and a QM approach. Our results show that the amide I main peak value, and related quantities, such as dipole strength (DS) and transition dipole moment (TDM), depends on protein secondary structure; in particular, from QM calculations arises that α-rich molecular systems present lower intensities than β-rich ones. Furthermore, it is possible to decouple and identify the intensity of the different contributions of the inter- and intra-molecular motions which characterize the FIR spectrum, starting from the results obtained with QM calculations." @default.
- W4296095405 created "2022-09-17" @default.
- W4296095405 creator A5043596555 @default.
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- W4296095405 date "2022-09-15" @default.
- W4296095405 modified "2023-09-25" @default.
- W4296095405 title "Theoretical Study of Vibrational Properties of Peptides: Force Fields in Comparison and Ab Initio Investigation" @default.
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- W4296095405 doi "https://doi.org/10.3390/condmat7030053" @default.
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