The proton transfer along the so-called D- and K- channels in cytochrome c oxidase is investigated by a combination of classical molecular dynamics simulations and quantum chemical calculations. Discrete protonation and conformational states are combined to a transition network, allowing to determine the most probable proton transfer pathways. Moreover, we investigate the communication between the two channels and the impact of a change in protonation state in one channel on the proton movement in the other one. Finally, a kinetic model will be constructed that allows for the direct comparison with experimentally-determined proton positions and transfer rates.
Bagherpoor Helabad, M., Ghane, T., Reidelbach, M., Woelke, A. L., Knapp, E. W., and Imhof, P. (2016). Protonation state dependent communication in Cytochrome c Oxidase. Biophysical Journal 111, 492-503.
Helabad, M.B., Ghane, T., Reidelbach, M., Woelke, A.L., Knapp, E.W., and Imhof, P. (2017). Protonation state-dependent communication in cytochrome c oxidase. Biophysical Journal 113, 817-828.
Imhof, P. (2016). A Networks Approach to Modeling Enzymatic Reactions. In: Gregory A. Voth (ed.) Methods in Enzymology: Computational approaches for studying Enzyme Mechanism 578, 249-271.
Reidelbach, M., Betz, F., Mäusle, R. M., and Imhof, P. (2016). Proton transfer pathways in an aspartate-water cluster sampled by a network of discrete states. Chemical Physics Letters 659, 169-175.