Computer simulation study of pH-dependent regulation of electron transport in chloroplasts

I. V. Kuvykin, A. V. Vershubskii, V. I. Priklonskii, A. N. Tikhonov

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A mathematical model is presented that describes the key steps of photosynthetic electron transport and transmembrane proton transfer in chloroplasts. Numerical modeling has been performed with due regard for regulatory processes at the donor and acceptor parts of photosystem (PS) I. The influence of pH-dependent activation of the Calvin cycle enzymes and energy dissipation in PS II (nonphotochemical quenching of chlorophyll fluorescence) on the light-induced redox transients of P700, plastoquinone, and NADP as well as on the changes in intrathylakoid pH and ATP level is examined. It is demonstrated that pH-dependent regulatory processes alter the distribution of electron fluxes on the acceptor side of PS I and the total rate of electron flow between PS II and PS I. The light-induced activation of the Calvin cycle leads to significant enhancement of the electron flow from PS I to NADP+ and attenuation of the electron flow to molecular oxygen.

Original languageEnglish
Pages (from-to)455-464
Number of pages10
JournalBiophysics
Volume54
Issue number4
DOIs
Publication statusPublished - Dec 2009
Externally publishedYes

Fingerprint

Photosystem I Protein Complex
Chloroplasts
Electron Transport
Computer Simulation
Electrons
Photosystem II Protein Complex
Photosynthesis
NADP
Plastoquinone
Light
Chlorophyll
Oxidation-Reduction
Protons
Theoretical Models
Adenosine Triphosphate
Fluorescence
Oxygen
Enzymes

Keywords

  • Chloroplasts
  • Electron transport
  • Mathematical model
  • pH-dependent regulation

ASJC Scopus subject areas

  • Biophysics

Cite this

Computer simulation study of pH-dependent regulation of electron transport in chloroplasts. / Kuvykin, I. V.; Vershubskii, A. V.; Priklonskii, V. I.; Tikhonov, A. N.

In: Biophysics, Vol. 54, No. 4, 12.2009, p. 455-464.

Research output: Contribution to journalArticle

Kuvykin, I. V. ; Vershubskii, A. V. ; Priklonskii, V. I. ; Tikhonov, A. N. / Computer simulation study of pH-dependent regulation of electron transport in chloroplasts. In: Biophysics. 2009 ; Vol. 54, No. 4. pp. 455-464.
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