A novel method for determining the electron tunneling pathway in protein

A novel method for determining the electron tunneling pathway in protein is proposed. The pathway is constructed connecting vectors of important interatomic currents of the tunneling electron. The method is applied to some ruthenium-modified azurins. From this analysis, we found that the through-space is very often used as well as the through-bond, while the hydrogen-bond is scarcely used in the important interatomic currents.