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• W2106576989 abstract "Experiments show that for many two state folders the free energy of the native state DG_ND([C]) changes linearly as the denaturant concentration [C] is varied. The slope, m = d DG_ND([C])/d[C], is nearly constant. The m-value is associated with the difference in the surface area between the native (N) and the denatured (D) state, which should be a function of DR_g^2, the difference in the square of the radius of gyration between the D and N states. Single molecule experiments show that the denatured state undergoes an equilibrium collapse transition as [C] decreases, which implies m also should be [C]-dependent. We resolve the conundrum between constant m-values and [C]-dependent changes in Rg using molecular simulations of a coarse-grained representation of protein L, and the Molecular Transfer Model, for which the equilibrium folding can be accurately calculated as a function of denaturant concentration. We find that over a large range of denaturant concentration (> 3 M) the m-value is a constant, whereas under strongly renaturing conditions ( 3 M because the [C]-dependent changes in the surface area of the backbone groups, which make the largest contribution to m, is relatively narrow in the denatured state. The burial of the backbone gives rise to substantial surface area changes below [C]< 3 M, leading to collapse in the denatured state. The midpoint of transition of individual residues vary significantly even though global folding can be described as an all-or-none transition. Collapse driven by the loss of favorable residue-solvent interactions and a concomitant increase in the strength of intrapeptide interactions with decreasing [C]. These interactions are non-uniformly distributed throughout the native structure of protein L." @default.
• W2106576989 created "2016-06-24" @default.
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• W2106576989 date "2009-04-16" @default.
• W2106576989 modified "2023-09-27" @default.
• W2106576989 title "Molecular origin of constant m-values, denatured state collapse, and residue-dependent transition midpoints in globular proteins" @default.
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