Abstract

Three derivatives of recombinant T65C-cytochrome b 5 were produced by labeling the single sulfhydryl group at Cys-65 with (4-(bromomethyl)-4'-methylbipyridine)bis(bipridine)ruthenium(2+), (4-bromomethyl-4'-methylbipyridine)bis(4,4'-dimethylbipyridine)ruthenium(2+), and (4-(bromomethyl)-4'-methylbipyridine)(bipyrimidine)-(bipyridine)ruthenium(2+). The ruthenium labels are linked to the heme iron through a well-defined 12-covalent-bond path and provide a range of free energies of reaction which bracket the expected reorganizational energy of 0.94 eV

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