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Khorasanizadeh S, Peters ID, Roder H
Evidence for a three-state model of protein folding from kinetic analysis of ubiquitin variants with altered core residues
Nature Structural Biology (1996) 3:193-205.
To elucidate the kinetic importance of structural intermediates in single-domain proteins, we measured the effect of solution conditions and amino-acid changes at a central core residue of ubiquitin (Val 26) on the kinetics of folding and unfolding. Kinetic analysis in terms of a sequential three-state mechanism provides insight into the contribution of specific interactions within the ubiquitin core to the structural stability of the native and intermediate states. The observation that disruptive mutations and/or addition of denaturants result in an apparent two-state folding process with slower rates is explained by the destabilization of a partially folded intermediate, which is in rapid equilibrium with unfolded states. The model predicts that under sufficiently stabilizing conditions kinetic intermediates may become populated even for proteins showing apparent two- state kinetics.
Publication Date: 1996-02-01.
Last updated on Wednesday, March 04, 2020