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Quantitative observation of backbone disorder in native elastin.

Maxim S Pometun1, Eduard Y Chekmenev, Richard J Wittebort

  • 1Department of Chemistry, University of Louisville, Louisville, Kentucky 40208, USA.

The Journal of Biological Chemistry
|November 20, 2003
PubMed
Summary

Elastin

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Area of Science:

  • Biochemistry
  • Biophysics
  • Materials Science

Background:

  • Elastin is a crucial protein for soft tissue function and pathology.
  • Understanding elastin's reversible elasticity requires insight into its structure and flexibility.
  • The role of disorder and hydration in elastin's mechanical properties remains incompletely understood.

Purpose of the Study:

  • To investigate the structural basis of elastin's reversible elasticity.
  • To examine polypeptide and water ordering in hydrated and dry elastin fibers.
  • To elucidate the relationship between elastin structure, disorder, and its mechanical properties.

Main Methods:

  • Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy was employed.
  • Hydration and polypeptide ordering were studied using deuterium (2H) and oxygen-17 (17O) NMR.
  • Carbon-13 (13C) NMR, including two-dimensional (13C) Magic Angle Spinning (MAS) methods, was used to assess backbone dynamics.

Main Results:

  • Tightly bound water molecules were found to be absent in both dry and hydrated elastin.
  • The elastin backbone in hydrated fibers exhibits significant disorder and large-amplitude motions.
  • A low order parameter (S < 0.1) for the backbone carbonyl group indicates a random coil-like structure, contrasting with most proteins (S ≈ 0.9).

Conclusions:

  • Elastin's backbone is highly disordered and dynamic, even in its elastic, hydrated state.
  • This inherent disorder, potentially due to high proline content, enhances elastin's coacervation process.
  • The findings provide a structural basis for elastin's unique mechanical properties and its role in soft tissue.

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