Femtosecond absorption spectroscopy of cytochrome  c  oxidase: Excited electronic states and relaxation processes in heme  a  and heme  a  3  centers

I. V. Shelaev; F. E. Gostev; T. V. Vygodina; S. V. Lepeshkevich; B. M. Dzhagarov

doi:10.1134/S0018143918010101

Femtosecond absorption spectroscopy of cytochrome c oxidase: Excited electronic states and relaxation processes in heme a and heme a₃ centers

作者: Shelaev I.V.¹, Gostev F.E.¹, Vygodina T.V.², Lepeshkevich S.V.³, Dzhagarov B.M.³
隶属关系:
1. Semenov Institute of Chemical Physics
2. Belozerski Institute of Physicochemical Biology
3. Stepanov Institute of Physics
期: 卷 52, 编号 1 (2018)
页面: 45-51
栏目: Photonics
URL: https://bakhtiniada.ru/0018-1439/article/view/157318
DOI: https://doi.org/10.1134/S0018143918010101
ID: 157318

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详细

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.