Electron transfer between globular proteins. Distance dependence elf the rate constant

Based on the assumption that electron transfer between globular proteins oc curs by a collective excitation of polaron type, the dependence of the rate of this process on the distance between the donor and acceptor centers wit h regard to their detailed electron structure was calculated, The electron structure of the heme was calculated by the quantum-chemical MNDO-PM3 metho d. The results were compared with experimental data on interprotein and int raglobular electron transfer, It is shown that, in the framework of this mo del, the electron transfer is not exponential and does not require a partic ular transfer pathway since the whole protein macromolecule is involved in the formation of the electron excited state.