Photon-assisted tunneling, of an electron in proteins with slow relaxation modes is considered at room temperatures. Quasi-coherent oscillations are found for an electron that is strongly coupled to the environment. An applied electric field is shown to effectively change the relaxation of the protein modes from slow to fast (and vice versa). This changes the quasi-coherent oscillations (slow relaxation) to exponential decay (fast relaxation). These features could be applied in switches and quantum computers.