Photoinduced electron transfer from carboxymethylated cytochrome c to plastocyanin
1998
Karpefors, M. | Wilson, M.T. | Brzezinski, P.
Photoinduced electron transfer from cytochrome c to plastocyanin was investigated using a novel method. Reduced carboxymethylated cytochrome c (CmCyt c), with carbon monoxide bound to the heme iron, and oxidized plastocyanin were mixed. At 1 mM CO the reduced state of CmCyt c is stabilized by about 350 meV. After flash photolysis of CO the apparent redox potential of CmCyt c drops resulting in electron transfer to plastocyanin. The electron transfer characteristics were investigated at approximately 30 different wavelengths in the range 390-460 nm. A global fit of the data showed that the electron transfer rate is 960 +/- 30 s-1 at pH 7.
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