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- W2045745322 abstract "The kinetics of the reaction of hydrated electron (e−aq) and carboxyl anion radical (CO⨪2) with Pseudomonas aeruginosa ferricytochrome c-551 were studied by pulse radiolysis. The rate of reaction of e−aq with the negatively charged ferricytochrome c-551 (17 nM−1 · s−1) is significantly slower than the larger positively charged horse heart ferricytochrome c (70 nM− · s−). This difference cannot be explained solely by electrostatic effects on the diffusion-controlled reactions. After the initial encounter of e−aq with the protein, ferricytochrome c-551 is less effective in transferring an electron to the heme which may be due to the negative charge on the protein. The charge on ferricytochrome c-551 is estimated to be −5 at pH 7 from the effect of ionic strength on the reaction rate. A slower relaxation (2 · 104 s−1) observed after fast e−aq reduction is attributed to a small conformational change. The rate of reaction of CO⨪2 with ferricytochrome c-551 (0.7 nM−1 · s−) is, after electrostatic correction, the same as ferricytochrome c, indicating that the steric requirements for reaction are similar. This reaction probably takes place through the exposed heme edge." @default.
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- W2045745322 date "1984-12-01" @default.
- W2045745322 modified "2023-09-27" @default.
- W2045745322 title "Pulse radiolysis kinetics of the reaction of the hydrated electron and the carboxyl anion radical with Pseudomonas aeruginosa cytochrome c-551" @default.
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- W2045745322 doi "https://doi.org/10.1016/0005-2728(84)90064-1" @default.
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