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• W2095505901 abstract "The reactions of yeast cytochrome c peroxidase with horse cytochrome c derivatives labeled at specific lysine amino groups with (dicarboxybipyridine)(bisbipyridine)ruthenium(II) [Ru(II)] were studied by flash photolysis. All of the derivatives formed complexes with cytochrome c peroxidase compound I (CMPI) at low ionic strength (2 mM sodium phosphate, pH 7). Excitation of Ru(II) to Ru(II*) with a short laser flash resulted in electron transfer to the ferric heme group in cytochrome c, followed by electron transfer to the radical site in CMPI. This reaction was biphasic and the rate constants were independent of CMPI concentration, indicating that both phases represented intracomplex electron transfer from the cytochrome c heme to the radical site in CMPI. The rate constants of the fast phase were 5200, 19,000, 55,000, and 14,300 s-1 for the derivatives modified at lysines 13, 25, 27, and 72, respectively. The rate constants of the slow phase were 260, 520, 200, and 350 s-1 for the same derivatives. These results suggest that there are two binding orientations for cytochrome c on CMPI. The binding orientation responsible for the fast phase involves a geometry that supports rapid electron transfer, while that for the slow phase allows only slow electron transfer. Increasing the ionic strength up to 40 mM increased the rate constant of the slow phase and decreased that of the fast phase. A single intracomplex electron transfer phase with a rate constant of 2800 s-1 was observed for the lysine 72 derivative at this ionic strength. When a series of light flashes was used to titrate CMPI to CMPII, the reaction between the cytochrome c derivative and the Fe(IV) site in CMPII was observed. The rate constants for this reaction were 110, 250, 350, and 140 s-1 for the above derivatives measured in low ionic strength buffer." @default.
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• W2095505901 date "1992-04-07" @default.
• W2095505901 modified "2023-10-18" @default.
• W2095505901 title "Photoinduced electron transfer between cytochrome c peroxidase and horse cytochrome c labeled at specific lysines with (dicarboxybipyridine)(bisbipyridine)ruthenium(II)" @default.
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• W2095505901 doi "https://doi.org/10.1021/bi00128a022" @default.
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