Specific monovalent cation effect on protein-protein interactions revealed by protein rotational diffusion analysis

The protein-protein interactions induced by cation specific effects were characterized by the rotational diffusion analysis. The rotational diffusion coefficient, Drot, estimated by time-resolved fluorescence anisotropy of fluorescent-labeled lysozyme was reduced responding to monovalent cation chlorides and was able to be approximated by quadratic functions of lysozyme concentration. The resultant first and second terms of lysozyme...