title: Diffusion-limited contact formation in unfolded cytochrome c: estimating the maximum rate of protein folding.
abstract: How fast can a protein fold? The rate of polypeptide collapse to a compact state sets an upper limit to the rate of folding. Collapse may in turn be limited by the rate of intrachain diffusion. To address this question, we have determined the rate at which two regions of an unfolded protein are brought into contact by diffusion. Our nanosecond-resolved spectroscopy shows that under strongly denaturing conditions, regions of unfolded cytochrome separated by approximately 50 residues diffuse together in 35-40 microseconds. This result leads to an estimate of approximately (1 microsecond)-1 as the upper limit for the rate of protein folding.
authors.affiliation: Laboratory of Chemical Physics, National Institute of Diabetes and Digestic and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892-0520, USA.
authors.forename: S J
authors.initials: SJ
authors.lastname: Hagen
authors.forename: J
authors.initials: J
authors.lastname: Hofrichter
authors.forename: A
authors.initials: A
authors.lastname: Szabo
authors.forename: W A
authors.initials: WA
authors.lastname: Eaton
mesh_terms: D003574:Cytochrome c Group / Q000737:chemistry* / Q000378:metabolism*; D004058:Diffusion; D019791:Guanidine; D006146:Guanidines; D006418:Heme; D007700:Kinetics; D008024:Ligands; D008715:Methionine / Q000031:analogs & derivatives; D008961:Models, Structural; D010544:Peroxidases / Q000737:chemistry / Q000378:metabolism; D011487:Protein Conformation; D011489:Protein Denaturation; D017510:Protein Folding; D013053:Spectrophotometry; D013997:Time Factors
chemical_list: D003574:Cytochrome c Group; D006146:Guanidines; D008024:Ligands; D006418:Heme; C006379:N-acetylmethionine; D008715:Methionine; D010544:Peroxidases; C021799:microperoxidase; D019791:Guanidine