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- W2317103301 abstract "Water oxidation by plants and cyanobacteria is performed via a light-driven cycle of five intermediates called S states (S0–S4) at the water oxidizing center (WOC) in photosystem II (PSII). The information about misses, i.e., the probabilities that the S-state transitions failed to advance, is crucial for detailed analysis of various spectroscopic data in investigations of the water oxidation mechanism. In this study, we have determined the miss probabilities of the individual S-state transitions using light-induced Fourier transform infrared (FTIR) difference spectroscopy. The extent of S-state transitions in the WOC upon each saturating flash was monitored by detecting the flow of electrons from the WOC to ferricyanide, an exogenous electron acceptor, using the CN stretching bands of ferricyanide and ferrocyanide. Simulation of the oscillation pattern of the flash-number dependence of the signal amplitude provided the miss probabilities for the S0 → S1, S1 → S2, S2 → S3, and S3 → S0 transitions (α0–α3, respectively) without any assumption about fitting parameters. The results for PSII preparations from Thermosynechococcus elongatus and spinach showed a general tendency of misses in the order, α0 ≤ α1 < α2 < α3, indicating that a more oxidized WOC has a higher miss probability. A very similar result observed for the YD-less mutant (D2-Y160F) of T. elongatus confirmed that YD does not affect the estimated misses. It was further shown that NO3– treatment specifically increased α3, consistent with inactivation of the S3 state reported previously. These results demonstrate the usefulness of this FTIR method for estimating individual miss probabilities in the S-state cycle in elucidation of the molecular mechanism of photosynthetic water oxidation." @default.
- W2317103301 created "2016-06-24" @default.
- W2317103301 creator A5005651755 @default.
- W2317103301 creator A5021580294 @default.
- W2317103301 creator A5026928374 @default.
- W2317103301 date "2012-08-17" @default.
- W2317103301 modified "2023-09-23" @default.
- W2317103301 title "Determination of the Miss Probabilities of Individual S-State Transitions during Photosynthetic Water Oxidation by Monitoring Electron Flow in Photosystem II Using FTIR Spectroscopy" @default.
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- W2317103301 doi "https://doi.org/10.1021/bi300708a" @default.
- W2317103301 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/22880689" @default.
- W2317103301 hasPublicationYear "2012" @default.
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