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- W2129193485 abstract "The rate of electron transfer between reduced cytochrome ƒ and plastocyanin (both purified from parsley) has been measured as k = 3.6 · 107 M−1 · s−1, at 298 °K and pH 7.0, with activation parameters ΔH‡ = 44 kJ · mole−1 and ΔS‡ = +46 J · mole−1 · °K−1. Replacement of cytochrome ƒ with red algal cytochrome c-553, Pseudomonas cytochrome c-551 and mammalian cytochrome c gave rates at least 30 times slower: k = 5 · 105, 7.5 · 105 and 1.0 · 106 M−1 · s−1, respectively. Similar measurements made with azurin instead of plastocyanin gave k = 6 · 106 and approx. 2 · 107 M−1 · s−1 for reaction of reduced azurin with cytochrome ƒ and algal cytochrome respectively. Rate constants of 115 and 80 M−1 · s−1 were found for reduction of plastocyanin by ascorbate and hydroquinone at 298 °K and pH 7.0. The rate constants for the oxidation of plastocyanin, cytochrome ƒ, Pseudomonas cytochrome c-551 and red algal cytochrome c-553 by ferricyanide were found to be between 3 · 104 and 8 · 104 M−1 · s−1. The results are discussed in relation to photosynthetic electron transport." @default.
- W2129193485 created "2016-06-24" @default.
- W2129193485 creator A5050901446 @default.
- W2129193485 date "1974-09-01" @default.
- W2129193485 modified "2023-10-02" @default.
- W2129193485 title "Rate of electron transfer between plastocyanin, cytochrome ƒ, related proteins and artificial redox reagents in solution" @default.
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- W2129193485 doi "https://doi.org/10.1016/0005-2728(74)90027-9" @default.
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