TY - JOUR VL - 39 Y1 - 2010/// JF - Annual Review of Biophysics IS - 1 A1 - Thirumalai, D. A1 - O'Brien, Edward P. A1 - Morrison, Greg A1 - Hyeon, Changbong PB - Annual Reviews SP - 159 ID - eprints1823 EP - 183 AV - none TI - Theoretical Perspectives on Protein Folding KW - universality in protein folding KW - role of protein length KW - molecular transfer model KW - single molecule force spectroscopy UR - http://dx.doi.org/10.1146/annurev-biophys-051309-103835 SN - 1936-122X N2 - Understanding how monomeric proteins fold under in vitro conditions is crucial to describing their functions in the cellular context. Significant advances in theory and experiments have resulted in a conceptual framework for describing the folding mechanisms of globular proteins. The sizes of proteins in the denatured and folded states, cooperativity of the folding transition, dispersions in the melting temperatures at the residue level, and timescales of folding are, to a large extent, determined by N, the number of residues. The intricate details of folding as a function of denaturant concentration can be predicted by using a novel coarse-grained molecular transfer model. By watching one molecule fold at a time, using single-molecule methods, investigators have established the validity of the theoretically anticipated heterogeneity in the folding routes and the N-dependent timescales for the three stages in the approach to the native state. Despite the successes of theory, of which only a few examples are documented here, we conclude that much remains to be done to solve the protein folding problem in the broadest sense. ER -