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Local interactions as a structure determinant for protein molecules: II

W R Krigbaum, A Komoriya

    Biochimica Et Biophysica Acta
    |January 25, 1979
    PubMed
    Summary
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    Van der Waals interactions between protein sidechains are crucial for native protein structure. These interactions drive nonpolar sidechains to cluster and similar polarities to associate, influencing overall protein folding.

    Area of Science:

    • Biophysics
    • Computational Biology
    • Protein Science

    Background:

    • Van der Waals interactions are fundamental forces in molecular interactions.
    • Protein structure is determined by various forces, including sidechain interactions.
    • Previous observations suggest specific patterns in protein sidechain distribution and pairing.

    Purpose of the Study:

    • To investigate the impact of Van der Waals interactions on protein structure.
    • To model how sidechain interactions influence protein folding and native states.

    Main Methods:

    • Analysis of radial distribution of polarity in known protein structures.
    • Examination of nonpolar sidechain clustering.
    • Statistical analysis of nearest-neighbor sidechain pairs.

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  • Development and application of three simplified protein models: sheath-core, chain-connected modification, and concentric spherical phases.

    • Main Results:

    • Observed increase in polarity from protein core to periphery.
    • Identified clustering of nonpolar sidechains.
    • Demonstrated non-random, polarity-driven associations between nearest-neighbor sidechains.
    • Results from simplified models support the significant role of Van der Waals forces.

    Conclusions:

    • Van der Waals interactions between protein sidechains play a critical role in determining native protein structure.
    • Sidechain interactions, driven by polarity, contribute to the hierarchical organization of protein molecules.
    • Simplified modeling approaches can effectively elucidate fundamental principles of protein folding.