Protein Folding as a Diffusional Process

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Abstract
A protein chain must move relative to the solvent molecules and explore many conformations when it folds from the extended unfolded state to the compact native state. Experimental and theoretical approaches suggest that diffusional processes in fact contribute to the kinetics of protein folding. We describe here how variations of the solvent viscosity can be employed to uncover the diffusional contributions to a folding reaction and assess the use of transition state theory and Kramers' rate theory for the analysis of protein folding reactions.