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Mechanics of elastin: molecular mechanism of biological elasticity and its relationship to contraction

  • Chapter
Mechanics of Elastic Biomolecules

Abstract

Description of the mechanics of elastin requires the understanding of two interlinked but distinct physical processes: the development of entropie elastic force and the occurrence of hydrophobic association. Elementary statistical-mechanical analysis of AFM single-chain force-extension data of elastin model molecules identifies damping of internal chain dynamics on extension as a fundamental source of entropie elastic force and eliminates the requirement of random chain networks. For elastin and its models, this simple analysis is substantiated experimentally by the observation of mechanical resonances in the dielectric relaxation and acoustic absorption spectra, and theoretically by the dependence of entropy on frequency of torsion-angle oscillations, and by classical molecular-mechanics and dynamics calculations of relaxed and extended states of the β-spiral description of the elastin repeat, (GVGVP) n . The role of hydrophobic hydration in the mechanics of elastin becomes apparent under conditions of isometric contraction. During force development at constant length, increase in entropie elastic force resulting from decrease in elastomer entropy occurs under conditions of increase in solvent entropy. This eliminates the solvent entropy change as the entropy change that gives rise to entropie elastic force and couples association of hydrophobic domains to the process. Therefore, association of hydrophobic domains within the elastomer at fixed length stretches interconnecting dynamic chain segments and causes an increase in the entropie elastic force due to the resulting damping of internal chain dynamics. Fundamental to the mechanics of elastin is the inverse temperature transition of hydrophobic association that occurs with development of mechanical resonances within fibrous elastin and polymers of repeat elastin sequences, which, with design of truly minimal changes in sequence, demonstrate energy conversions extant in biology and demonstrate the special capacity of bound phosphates to raise the free energy of hydrophobic association.

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Authors and Affiliations

  1. University of Minnesota, Twin Cities Campus, BioTechnology Institute, 1479 Gortner Avenue, St. Paul, MN, 55108-6106, USA

    D. W. Urry

  2. Bioelastics Research Ltd., 2800 Milan Court, Suite 386, Birmingham, AL, 35211-6918, USA

    D. W. Urry & T. M. Parker

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  1. D. W. Urry
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  2. T. M. Parker
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Editors and Affiliations

  1. University of Heidelberg, Heidelberg, Germany

    Wolfgang A. Linke

  2. Washington State University, Pullman, WA, USA

    Henk Granzier

  3. University of Pécs, Pécs, Hungary

    Miklós S. Z. Kellermayer

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Urry, D.W., Parker, T.M. (2003). Mechanics of elastin: molecular mechanism of biological elasticity and its relationship to contraction. In: Linke, W.A., Granzier, H., Kellermayer, M.S.Z. (eds) Mechanics of Elastic Biomolecules. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0147-2_14

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  • DOI: https://doi.org/10.1007/978-94-010-0147-2_14

  • Publisher Name: Springer, Dordrecht

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  • Online ISBN: 978-94-010-0147-2

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