Femtosecond absorption spectroscopy of cytochrome c oxidase: Excited electronic states and relaxation processes in heme a and heme a3 centers |
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| Authors: | I. V. Shelaev F. E. Gostev T. V. Vygodina S. V. Lepeshkevich B. M. Dzhagarov |
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| Affiliation: | 1.Semenov Institute of Chemical Physics,Russian Academy of Sciences,Moscow,Russia;2.Belozerski Institute of Physicochemical Biology,Moscow State University,Moscow,Russia;3.Stepanov Institute of Physics,National Academy of Sciences of Belarus,Minsk,Belarus |
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| Abstract: | Cytochrome c oxidase, the key bioenergetic protein, was studied by femtosecond absorption spectroscopy. Time-resolved spectral characteristics of the difference spectra recorded in the timescale from 80 fs to 20 ps were analyzed. Electronic relaxation of the excitation energy in heme a occurs in three successive steps. After completion of these steps, heme a is in the excited vibrational state of the ground state. Vibrational relaxation, cooling of the heme, occurs for several picoseconds. |
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