Biology – Quantitative Biology – Biomolecules
Scientific paper
2007-07-16
Biology
Quantitative Biology
Biomolecules
10 pages, 5 figures, to be published in J. Phys. Chem. B
Scientific paper
Using a time-dependent perturbation theory, vibrational energy relaxation (VER) of isotopically labeled amide I modes in cytochrome c solvated with water is investigated. Contributions to the VER are decomposed into two contributions from the protein and water. The VER pathways are visualized using radial and angular excitation functions for resonant normal modes. Key differences of VER among different amide I modes are demonstrated, leading to a detailed picture of the spatial anisotropy of the VER. The results support the experimental observation that amide I modes in proteins relax with sub picosecond timescales, while the relaxation mechanism turns out to be sensitive to the environment of the amide I mode.
Fujisaki Hiroshi
Straub John E.
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