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- W2890926291 abstract "This work aims to fully elucidate the effects of a trehalose glassy matrix on electron transfer reactions in cyanobacterial Photosystem I (PS I). Forward and backward electron transfer rates from A1A- and A1B- to FX, and charge recombination rates from A0-, A1B-, A1A-, FX-, and [FA/FB]- to P700+ were measured in P700-FA/FB complexes, P700-FX cores, and P700-A1 cores, both in liquid and in a trehalose glassy matrix at 11% humidity. By comparing CONTIN-resolved kinetic events over 6 orders of time in increasingly simplified versions of PS I at 480 nm, a wavelength that reports primarily A1A-/A1B- oxidation, and over 9 orders of time at 830 nm, a wavelength that reports P700+ reduction and A0- oxidation, assignments could be made for nearly all of the resolved kinetic phases. Trehalose-embedded PS I samples demonstrated partially arrested forward electron transfer. The fractions of complexes in which electron transfer did not proceed beyond A0, A1 and FX were 53%, 16% and 22%, respectively, with only 10% of electrons reaching the terminal FA/FB clusters. The ~10 μs and ~150 μs components in both liquid and trehalose-embedded PS I were assigned to recombination between A1B- and P700+ and between A1A- and P700+, respectively. The kinetics and amplitudes of these resolved kinetic phases in liquid and trehalose-embedded PS I samples could be well-fitted by a kinetic model that allowed us to calculate the asymmetrical contribution of the A1A- and A1B- quinones to the electrochromic signal at 480 nm. Possible reasons for these effects are discussed." @default.
- W2890926291 created "2018-09-27" @default.
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- W2890926291 date "2018-12-01" @default.
- W2890926291 modified "2023-10-17" @default.
- W2890926291 title "Critical evaluation of electron transfer kinetics in P700–FA/FB, P700–FX, and P700–A1 Photosystem I core complexes in liquid and in trehalose glass" @default.
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- W2890926291 doi "https://doi.org/10.1016/j.bbabio.2018.09.367" @default.
- W2890926291 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30463673" @default.
- W2890926291 hasPublicationYear "2018" @default.
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