SCALING LAW FOR THE NONEXPONENTIAL LIGAND REBINDING OF CO IN MYOGLOBIN

The non-exponential kinetics of the rebinding in myoglobin is simulate d by universal functions such as a Havriliak-Negami function, a ration al approximation or a modified stretched exponential all of which depe nd on time via a scaling variable (t/tau(1/2)(T))beta((T)). For the sc aling parameters, the half-decay time tau(1/2) and the exponent beta t he temperature dependence including tunneling effects are analyzed. It is shown that the scaling properties imply temperature-dependent dist ributions of activation energies and the existence of a critical tempe rature T similar to 170-190 K above which no positive static distribu tion exists.