Electron-phonon coupling in cyanobacterial photosystem i

Dmitry A. Cherepanov, Georgy E. Milanovsky, Oksana A. Gopta, Ramakrishnan Balasubramanian, Donald Ashley Bryant, Alexey Yu Semenov, John H. Golbeck

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

One of the fundamental problems in biophysics is whether the protein medium at room temperature can be properly treated as a fluid dielectric or whether its dynamics is determined by a highly ordered molecular structure resembling the properties of crystalline and amorphous solids. Here, we measured the recombination between reduced A1 and the oxidized chlorophyll special pair P700 over a wide temperature range using preparations of photosystem I from the cyanobacterium Synechococcus sp. PCC 7002 depleted of the iron-sulfur clusters. We found that the dielectric properties of the protein matrix in early electron transfer reactions of photosystem I resemble the behavior of solids that require an implicit treatment of electron-phonon coupling even at ambient temperatures. The quantum effects of electron-phonon coupling in proteins could account for a variety of phenomena, such as the weak sensitivity of electron transfer in pigment-protein complexes to changing environmental conditions including temperature, driving force, polarity, and chemical composition.

Original languageEnglish (US)
Pages (from-to)7943-7955
Number of pages13
JournalJournal of Physical Chemistry B
Volume122
Issue number33
DOIs
StatePublished - Aug 23 2018

Fingerprint

proteins
Proteins
Photosystem I Protein Complex
Electrons
electron transfer
electrons
Biophysics
biophysics
Temperature
chlorophylls
Chlorophyll
pigments
Sulfur
Pigments
Dielectric properties
Molecular structure
ambient temperature
dielectric properties
polarity
chemical composition

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Cherepanov, D. A., Milanovsky, G. E., Gopta, O. A., Balasubramanian, R., Bryant, D. A., Semenov, A. Y., & Golbeck, J. H. (2018). Electron-phonon coupling in cyanobacterial photosystem i. Journal of Physical Chemistry B, 122(33), 7943-7955. https://doi.org/10.1021/acs.jpcb.8b03906
Cherepanov, Dmitry A. ; Milanovsky, Georgy E. ; Gopta, Oksana A. ; Balasubramanian, Ramakrishnan ; Bryant, Donald Ashley ; Semenov, Alexey Yu ; Golbeck, John H. / Electron-phonon coupling in cyanobacterial photosystem i. In: Journal of Physical Chemistry B. 2018 ; Vol. 122, No. 33. pp. 7943-7955.
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Cherepanov, DA, Milanovsky, GE, Gopta, OA, Balasubramanian, R, Bryant, DA, Semenov, AY & Golbeck, JH 2018, 'Electron-phonon coupling in cyanobacterial photosystem i', Journal of Physical Chemistry B, vol. 122, no. 33, pp. 7943-7955. https://doi.org/10.1021/acs.jpcb.8b03906

Electron-phonon coupling in cyanobacterial photosystem i. / Cherepanov, Dmitry A.; Milanovsky, Georgy E.; Gopta, Oksana A.; Balasubramanian, Ramakrishnan; Bryant, Donald Ashley; Semenov, Alexey Yu; Golbeck, John H.

In: Journal of Physical Chemistry B, Vol. 122, No. 33, 23.08.2018, p. 7943-7955.

Research output: Contribution to journalArticle

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Cherepanov DA, Milanovsky GE, Gopta OA, Balasubramanian R, Bryant DA, Semenov AY et al. Electron-phonon coupling in cyanobacterial photosystem i. Journal of Physical Chemistry B. 2018 Aug 23;122(33):7943-7955. https://doi.org/10.1021/acs.jpcb.8b03906