The reactivity of hydrazine with photosystem II strongly depends on the redox state of the water oxidizing system. Messinger, J. & Renger, G. FEBS Letters, 277(1-2):141–146, 1990. _eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1016/0014-5793%2890%2980829-8![The reactivity of hydrazine with photosystem II strongly depends on the redox state of the water oxidizing system [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex The decay kinetics of the redox states S2 and S3 of the water-oxidizing enzyme have been analyzed in isolated spinach thylakoids in the absence and presence of the exogenous reductant hydrazine. In control samples without NH2NH2 a biphasic decay is observed. The rapid decline of S2 and S3 with yD as reductant exhibits practically the same kinetics with t 1/2 = 6-7 s at pH = 7.2 and 7°C. The slow reduction (order of 5-10 min at 7°C) of S2 and S3 with endogenous electron donors other than yD is about twice as fast for S2 as for S3 under these conditions. In contrast, the hydrazine-induced reductive shifts of the formal redox states Si (i = 0⋯3) are characterized by a totally different kinetic pattern: (a) at 1 mMNH2NH2 and incubation on ice the decay of S2 is estimated to be at least 25 times faster (t 1/2⩽0.4 min) than the corresponding reaction of S3 (t 1/2≈13 min); (b) the NH2NH2-induced decay of S2 is even slower (about twice) than the transformation of S1 into the formal redox state ‘S−1’ (t 1/2≈6 min), which gives rise to the two-digit phase shift of the oxygen-yield pattern induced by a flash train in dark adapted thylakoids. (c) the NH2NH2-induced transformation S0→‘S−2’ [Renger, Messinger and Hanssum (1990) in: Curr. Res. Photosynth. (Baltscheffsky, M., ed). Vol. 1, pp. 845-848, Kluwer, Dordrecht] is about three times faster (t 1/2≈ min) than the reaction. Based on these results, the following dependence on the redox state Si of the reactivity towards NH2NH2 is obtained: S3 \textless S1 \textless S0 ⪡ S2. The implications of this surprising order of reactivity are discussed.
@article{messinger_reactivity_1990,
title = {The reactivity of hydrazine with photosystem {II} strongly depends on the redox state of the water oxidizing system},
volume = {277},
copyright = {FEBS Letters 277 (1990) 1873-3468 © 2015 Federation of European Biochemical Societies},
issn = {1873-3468},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1016/0014-5793%2890%2980829-8},
doi = {10.1016/0014-5793(90)80829-8},
abstract = {The decay kinetics of the redox states S2 and S3 of the water-oxidizing enzyme have been analyzed in isolated spinach thylakoids in the absence and presence of the exogenous reductant hydrazine. In control samples without NH2NH2 a biphasic decay is observed. The rapid decline of S2 and S3 with yD as reductant exhibits practically the same kinetics with t 1/2 = 6-7 s at pH = 7.2 and 7°C. The slow reduction (order of 5-10 min at 7°C) of S2 and S3 with endogenous electron donors other than yD is about twice as fast for S2 as for S3 under these conditions. In contrast, the hydrazine-induced reductive shifts of the formal redox states Si (i = 0⋯3) are characterized by a totally different kinetic pattern: (a) at 1 mMNH2NH2 and incubation on ice the decay of S2 is estimated to be at least 25 times faster (t 1/2⩽0.4 min) than the corresponding reaction of S3 (t 1/2≈13 min); (b) the NH2NH2-induced decay of S2 is even slower (about twice) than the transformation of S1 into the formal redox state ‘S−1’ (t 1/2≈6 min), which gives rise to the two-digit phase shift of the oxygen-yield pattern induced by a flash train in dark adapted thylakoids. (c) the NH2NH2-induced transformation S0→‘S−2’ [Renger, Messinger and Hanssum (1990) in: Curr. Res. Photosynth. (Baltscheffsky, M., ed). Vol. 1, pp. 845-848, Kluwer, Dordrecht] is about three times faster (t 1/2≈ min) than the reaction. Based on these results, the following dependence on the redox state Si of the reactivity towards NH2NH2 is obtained: S3 {\textless} S1 {\textless} S0 ⪡ S2. The implications of this surprising order of reactivity are discussed.},
language = {en},
number = {1-2},
urldate = {2024-11-25},
journal = {FEBS Letters},
author = {Messinger, J. and Renger, G.},
year = {1990},
note = {\_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1016/0014-5793\%2890\%2980829-8},
keywords = {Hydrazine, Hydroxylamine, Photosystem II, Si-state lifetimes, Water oxidation},
pages = {141--146},
}
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The rapid decline of S2 and S3 with yD as reductant exhibits practically the same kinetics with t 1/2 = 6-7 s at pH = 7.2 and 7°C. The slow reduction (order of 5-10 min at 7°C) of S2 and S3 with endogenous electron donors other than yD is about twice as fast for S2 as for S3 under these conditions. In contrast, the hydrazine-induced reductive shifts of the formal redox states Si (i = 0⋯3) are characterized by a totally different kinetic pattern: (a) at 1 mMNH2NH2 and incubation on ice the decay of S2 is estimated to be at least 25 times faster (t 1/2⩽0.4 min) than the corresponding reaction of S3 (t 1/2≈13 min); (b) the NH2NH2-induced decay of S2 is even slower (about twice) than the transformation of S1 into the formal redox state ‘S−1’ (t 1/2≈6 min), which gives rise to the two-digit phase shift of the oxygen-yield pattern induced by a flash train in dark adapted thylakoids. (c) the NH2NH2-induced transformation S0→‘S−2’ [Renger, Messinger and Hanssum (1990) in: Curr. Res. Photosynth. (Baltscheffsky, M., ed). Vol. 1, pp. 845-848, Kluwer, Dordrecht] is about three times faster (t 1/2≈ min) than the reaction. Based on these results, the following dependence on the redox state Si of the reactivity towards NH2NH2 is obtained: S3 \\textless S1 \\textless S0 ⪡ S2. The implications of this surprising order of reactivity are discussed.","language":"en","number":"1-2","urldate":"2024-11-25","journal":"FEBS Letters","author":[{"propositions":[],"lastnames":["Messinger"],"firstnames":["J."],"suffixes":[]},{"propositions":[],"lastnames":["Renger"],"firstnames":["G."],"suffixes":[]}],"year":"1990","note":"_eprint: https://onlinelibrary.wiley.com/doi/pdf/10.1016/0014-5793%2890%2980829-8","keywords":"Hydrazine, Hydroxylamine, Photosystem II, Si-state lifetimes, Water oxidation","pages":"141–146","bibtex":"@article{messinger_reactivity_1990,\n\ttitle = {The reactivity of hydrazine with photosystem {II} strongly depends on the redox state of the water oxidizing system},\n\tvolume = {277},\n\tcopyright = {FEBS Letters 277 (1990) 1873-3468 © 2015 Federation of European Biochemical Societies},\n\tissn = {1873-3468},\n\turl = {https://onlinelibrary.wiley.com/doi/abs/10.1016/0014-5793%2890%2980829-8},\n\tdoi = {10.1016/0014-5793(90)80829-8},\n\tabstract = {The decay kinetics of the redox states S2 and S3 of the water-oxidizing enzyme have been analyzed in isolated spinach thylakoids in the absence and presence of the exogenous reductant hydrazine. In control samples without NH2NH2 a biphasic decay is observed. The rapid decline of S2 and S3 with yD as reductant exhibits practically the same kinetics with t 1/2 = 6-7 s at pH = 7.2 and 7°C. The slow reduction (order of 5-10 min at 7°C) of S2 and S3 with endogenous electron donors other than yD is about twice as fast for S2 as for S3 under these conditions. In contrast, the hydrazine-induced reductive shifts of the formal redox states Si (i = 0⋯3) are characterized by a totally different kinetic pattern: (a) at 1 mMNH2NH2 and incubation on ice the decay of S2 is estimated to be at least 25 times faster (t 1/2⩽0.4 min) than the corresponding reaction of S3 (t 1/2≈13 min); (b) the NH2NH2-induced decay of S2 is even slower (about twice) than the transformation of S1 into the formal redox state ‘S−1’ (t 1/2≈6 min), which gives rise to the two-digit phase shift of the oxygen-yield pattern induced by a flash train in dark adapted thylakoids. (c) the NH2NH2-induced transformation S0→‘S−2’ [Renger, Messinger and Hanssum (1990) in: Curr. Res. Photosynth. (Baltscheffsky, M., ed). Vol. 1, pp. 845-848, Kluwer, Dordrecht] is about three times faster (t 1/2≈ min) than the reaction. Based on these results, the following dependence on the redox state Si of the reactivity towards NH2NH2 is obtained: S3 {\\textless} S1 {\\textless} S0 ⪡ S2. 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