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Related Experiment Videos

Self-aggregation characteristics of recombinantly expressed human elastin polypeptides.

C M Bellingham1, K A Woodhouse, P Robson

  • 1Cardiovascular Research Program, Research Institute, Hospital for Sick Children, Toronto, ON, Canada.

Biochimica Et Biophysica Acta
|December 12, 2001
PubMed
Summary

Specific sequences within hydrophobic domains are crucial for elastin self-assembly. This protein

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Area of Science:

  • Biochemistry
  • Extracellular Matrix Biology
  • Protein Self-Assembly

Background:

  • Elastin, an extracellular matrix protein, provides extensibility and elastic recoil to tissues.
  • Monomeric elastin can self-organize into fibrillar structures in vitro and in vivo.
  • The role of specific hydrophobic and crosslinking domains in elastin self-assembly is not fully understood.

Purpose of the Study:

  • To investigate the factors influencing elastin self-assembly using defined recombinant human elastin polypeptides.
  • To determine the contribution of specific hydrophobic domains to elastin's self-organization propensity.

Main Methods:

  • Utilized a series of defined, recombinant human elastin polypeptides.
  • Measured coacervation temperature as an indicator of self-assembly propensity.

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  • Varied salt and polypeptide concentrations to assess their influence.

    • Main Results:

    • Coacervation temperature was influenced by both salt and polypeptide concentrations.
    • Hydrophobic domains were found to be essential for elastin polypeptide self-assembly.
    • Molecular mass, number of hydrophobic domains, or general hydropathy did not fully explain coacervation temperature differences.

    Conclusions:

    • The specific sequences within hydrophobic domains are critical determinants of elastin polypeptide self-assembly.
    • Elastin's self-organization is a complex process influenced by more than just the overall hydrophobicity or size of its domains.