Figure 3.
Electron tunnelling simulation of oxidase using different estimates of the midpoint potentials of the individual redox couples of O2. (a) Completely averaged O2 redox couple values as if 100% moderated by the enzyme environment; the picosecond electron tunnelling reactions in this simulation would not be observed experimentally as they would be limited by the 10 μs O2 diffusion rate (grey shading). (b) O2 redox couple midpoints as in aqueous solution, but moderate 5% levelling by the protein. (c) O2 redox couples as reported in aqueous solution, pH 7. Default reorganization energies for electron tunnelling are 0.7 eV throughout.