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Mobility and function in elastin and collagen.

D A Torchia, L S Batchelder, W W Fleming

    Ciba Foundation Symposium
    |January 1, 1983
    PubMed
    Summary
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    Nuclear magnetic resonance reveals elastin chains possess high molecular flexibility, supporting a rubber-like network model. Collagen side-chains show fluid domain interactions, crucial for fibril assembly, but this flexibility is lost upon mineralization.

    Area of Science:

    • Biophysics
    • Materials Science
    • Biochemistry

    Background:

    • Elastin's rubber-like elasticity and collagen's fibrillar structure are key to tissue function.
    • Understanding the molecular dynamics of these proteins is crucial for tissue engineering and disease research.

    Purpose of the Study:

    • To investigate the molecular dynamics and structural models of elastin using nuclear magnetic resonance (NMR).
    • To explore intermolecular interactions and flexibility within collagen fibrils.

    Main Methods:

    • Incorporation of carbon-13 (13C) and deuterium (2H)-labelled amino acids into elastin and collagen.
    • Analysis of NMR relaxation parameters and line-shapes to determine rotational correlation times.

    Main Results:

    Related Experiment Videos

    • Elastin backbone carbonyl carbons exhibit high flexibility, supporting a rubber-like network model.
    • Collagen side-chains in reconstituted fibrils display significant flexibility in fluid domains, essential for assembly.
    • Cross-links do not affect collagen flexibility, but mineralization eliminates it.

    Conclusions:

    • Elastin's molecular dynamics align with a rubber-like network structure.
    • Collagen fibril assembly involves interactions within fluid domains of flexible side-chains.
    • Mineralization significantly hinders collagen's molecular flexibility.