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Asymmetry in the Shapes of Folded and Denatured States of Proteins

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    Asymmetry in the Shapes of Folded and Denatured States of Proteins†
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    Institute for Physical Science and Technology and Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742
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    The Journal of Physical Chemistry B

    Cite this: J. Phys. Chem. B 2004, 108, 21, 6564–6570
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    https://doi.org/10.1021/jp037128y
    Published March 16, 2004
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    Abstract

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    The asymmetry in the shapes of folded and unfolded states are probed using two parameters, Δ (a measure of the sphericity) and S that describes the shape (S > 0 corresponds to prolate and S < 0 represents oblate). For the folded states, whose interiors are densely packed, the radii of gyration (Rg), Δ, and S are calculated using the coordinates of the experimentally determined structures. Although Rg scales as N1/3, as expected for maximally compact structures, the distributions of Δ and S show that there is considerable asymmetry in the shapes of folded structures. The degree of asymmetry is greater for proteins that form oligomers. Analysis of the two- and three-body contacts in the native structures shows that the presence of near equal number of contacts between backbone and side-chains and between side-chains gives rise to dense packing. We suggest that proteins with relatively large values of Δ and S can tolerate volume mutations without greatly affecting the network of contacts or their stability. Limited analysis of the mutagenesis data on T4 lysozyme and λ-repressor support this conclusion. To probe shape characteristics of denatured states we have developed a Cα − Cβ model of a WW-like domain. The shape parameters, which are calculated using Langevin simulations, change dramatically in the course of coil-to-globule transition. Comparison of the values of Δ and S between the globular state and the folded state of WW domain shows that both energetic (especially dispersion in the hydrophobic interactions) and steric effects are important in determining packing in proteins.

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     Part of the special issue “Hans C. Andersen Festschrift”.

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     Corresponding author.

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    The Journal of Physical Chemistry B

    Cite this: J. Phys. Chem. B 2004, 108, 21, 6564–6570
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    https://doi.org/10.1021/jp037128y
    Published March 16, 2004
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