ArticleProceedings of the National Academy of Sciences of the United States of America2006
Kinetics and mechanism of electron transfer in intact photosystem II and in the isolated reaction center: pheophytin is the primary electron acceptor.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2006. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 118 papers.
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118 citing papers in PubMed, 354 citations in OpenAlex.
- Effects of high light and elevated temperature on the structure of photosystem II isolated from Arabidopsis thaliana.Photosynthesis research · 2026Article
- Asymmetric Connectivity Between Redox-Active Tyrosines and Reaction-Center Chlorophylls in Photosystem II.Plants (Basel, Switzerland) · 2026Article
- Photosystem-Based Biophotoelectrodes for Solar Energy Conversion.Chemical reviews · 2026Article
- Water-modulated conformational heterogeneity underlies multiple timescales of primary charge separation in photosystem II.Nature communications · 2026Article
- Dynamic LHCI antenna and inter-photosystem spillover enable flexible light harvesting in Euglena gracilis.The Plant journal : for cell and molecular biology · 2026Article
- Comparison of Chlorophyll and Bacteriochlorophyll Ultrafast Transient Absorption Spectra and Kinetics.Molecules (Basel, Switzerland) · 2026Article
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- Microscopic basis of reaction center modulation in PsbA variants of photosystem II.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Network analysis with quantum dynamics clarifies why photosystem II exploits both chlorophyll a and b.Science advances · 2025Article
- Primary charge separation in Chloroflexus aurantiacus reaction centers at room temperature: ultrafast transient absorption measurements on QPhotosynthesis research · 2025Article
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- Absorption changes in Photosystem II in the Soret band region upon the formation of the chlorophyll cation radical [PPhotosynthesis research · 2024Article
- Structural basis for the distinct core-antenna assembly of cryptophyte photosystem II.Nature communications · 2024Article
- Excitation landscape of the CP43 photosynthetic antenna complex from multiscale simulations.Chemical science · 2024Article
- Inter-subunit energy transfer processes in a minimal plant photosystem II supercomplex.Science advances · 2024Article
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- Reinvestigation on primary processes of PSII-dimer from Thermosynechococcus vulcanus by femtosecond pump-probe spectroscopy.Photosynthesis research · 2024Article
- Reaction Center Excitation in Photosystem II: From Multiscale Modeling to Functional Principles.Accounts of chemical research · 2023Article
58 more citing papers are in PubMed but not listed here.
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6 authors at 2 institutions in 1 country.
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No grant is acknowledged in the PubMed record.
Abstract
The mechanism and kinetics of electron transfer in isolated D1/D2-cyt(b559) photosystem (PS) II reaction centers (RCs) and in intact PSII cores have been studied by femtosecond transient absorption and kinetic compartment modeling. For intact PSII, a component of approximately 1.5 ps reflects the dominant energy-trapping kinetics from the antenna by the RC. A 5.5-ps component reflects the apparent lifetime of primary charge separation, which is faster by a factor of 8-12 than assumed so far. The 35-ps component represents the apparent lifetime of formation of a secondary radical pair, and the approximately 200-ps component represents the electron transfer to the Q(A) acceptor. In isolated RCs, the apparent lifetimes of primary and secondary charge separation are approximately 3 and 11 ps, respectively. It is shown (i) that pheophytin is reduced in the first step, and (ii) that the rate constants of electron transfer in the RC are identical for PSII cores and for isolated RCs. We interpret the first electron transfer step as electron donation from the primary electron donor Chl(acc D1). Thus, this mechanism, suggested earlier for isolated RCs at cryogenic temperatures, is also operative in intact PSII cores and in isolated RCs at ambient temperature. The effective rate constant of primary electron transfer from the equilibrated RC* excited state is 170-180 ns(-1), and the rate constant of secondary electron transfer is 120-130 ns(-1).
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