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- W2330256475 abstract "Vibrational energy flow in ferric cytochrome c has been examined by picosecond time-resolved anti-Stokes ultraviolet resonance Raman (UVRR) measurements. By taking advantage of the extremely short nonradiative excited state lifetime of heme in the protein (<< ps), excess vibrational energy of 20000-25000 cm(-1) was optically deposited selectively at the heme site. Subsequent energy relaxation in the protein moiety was investigated by monitoring the anti-Stokes UVRR intensities of the Trp59 residue, which is a single tryptophan residue involved in the protein that is located close to the heme group. It was found from temporal changes of the anti-Stokes UVRR intensities that the energy flow from the heme to Trp59 and the energy release from Trp59 took place with the time constants of 1-3 and ~8 ps, respectively. These data are consistent with the time constants for the vibrational relaxation of the heme and heating of water reported for hemeproteins. The kinetics of the energy flow were not affected by the amount of excess energy deposited at the heme group. These results demonstrate that the present technique is a powerful tool for studying the vibrational energy flow in proteins." @default.
- W2330256475 created "2016-06-24" @default.
- W2330256475 creator A5012095999 @default.
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- W2330256475 date "2011-10-13" @default.
- W2330256475 modified "2023-10-16" @default.
- W2330256475 title "Direct Observation of Vibrational Energy Flow in Cytochrome <i>c</i>" @default.
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- W2330256475 doi "https://doi.org/10.1021/jp207500b" @default.
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