Abstract
We present Monte Carlo simulations illustrating the influence of reorientation of hydrogen bonds in proteins on long-range interprotein electron transfer. The lattice protein model employed mimics the electron donor (or acceptor) interacting with an antiparallel β sheet. In addition, we take into account harmonic vibrations of the medium and also the dependence of the coupling matrix element on orientation of hydrogen bonds near the donor and/or acceptor. The results obtained show that the interaction between the tunneling electron and amino-acid residues, which are responsible for the formation of hydrogen bonds, may result in broadening the parabolic dependence of the electron-transfer rate constant on the reaction exothermicity and also in deviations from this dependence especially in the cases when the β sheet is linked with the electron donor.
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Zhdanov, V. Simulation of the Effect of Reorientation of Hydrogen Bonds in Proteins on Long-Range Electron Transfer. J Biol Phys 30, 365–375 (2004). https://doi.org/10.1007/s10867-004-2597-3
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DOI: https://doi.org/10.1007/s10867-004-2597-3