Abstract
The rates of folding of wild–type chymotrypsin inhibitor 2 (CI2) (t 1/2 = 12 ms) and of faster (t 1/2 = 2 ms) and slower (t 1/2 = 350 ms) folding mutants are accelerated in parallel by increasing concentrations of sucrose, despite the increases in viscosity. At a viscosity 26 times that of water, the folding rate constant of wild–type CI2 is accelerated four–fold (t 1/2 = 2.7 ms). From this, we can estimate that the diffusional chain collapse in CI2 occurs in less than 100 μs in water, and is not rate–determining in folding.
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Acknowledgements
We thank V. Daggett, D. Thirumalai and L. S. Itzhaki for discussions and communication of unpublished data, Y.M. Lam, A. Windle and A. Holmes for the use of the Ubbelohde viscometer. A.G.L. is supported by a pre–doctoral fellowship from the Boehringer Ingelheim Fonds (Stuttgart, Germany).
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Ladurner, A., Fersht, A. Upper limit of the time scale for diffusion and chain collapse in chymotrypsin inhibitor 2. Nat Struct Mol Biol 6, 28–31 (1999). https://doi.org/10.1038/4899
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DOI: https://doi.org/10.1038/4899