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Elastin is Responsible for Tissue Elasticity01:12

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Elastic fiber contains the protein elastin along with lesser amounts of other proteins and glycoproteins. The main property of elastin is that it will return to its original shape after being stretched or compressed. Elastic fibers are prominent in elastic tissues found in skin and the elastic ligaments of the vertebral column.
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Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of either alpha helices or beta sheets and, in rare cases, a mix of both. The amino acids in the primary structure often consist of repeating amino acid sequences. The role of fibrous proteins is primarily structural. Many are located in the extracellular matrix and are present in connective tissues to impart strength and joint mobility. They are...
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One of the significant functions of connective tissue is connecting tissues and organs. Unlike epithelial tissue that is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. The matrix usually includes a large amount of extracellular material produced by the connective tissue cells that are embedded within it. It plays a significant role in the functioning of this tissue. The major component of the matrix is a...
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Three main types of fibers are secreted by fibroblasts: collagen fibers, elastic fibers, and reticular fibers. Collagen fiber is made from fibrous protein subunits linked together to form a long, straight fiber. Collagen fibers, while flexible, have great tensile strength, resist stretching, and give ligaments and tendons their characteristic resilience and strength. These fibers hold connective tissues together, even during the body's movement.
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Production of Elastin-like Protein Hydrogels for Encapsulation and Immunostaining of Cells in 3D
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The liquid structure of elastin.

Sarah Rauscher1,2, Régis Pomès1,2

  • 1Molecular Medicine, The Hospital for Sick Children, Toronto, Canada.

Elife
|November 10, 2017
PubMed
Summary
This summary is machine-generated.

Massive simulations reveal elastin peptides self-assemble via hydrophobic effects, forming a disordered, liquid-like state. This structure, stabilized by hydration and transient bonds, resolves long-standing debates on elastin

Keywords:
biophysicsintrinsically-disordered proteinmolecular dynamicsnonephase separationprotein aggregationself-assembled elastomerstructural biology

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Area of Science:

  • Biophysics
  • Materials Science
  • Protein Chemistry

Background:

  • Elastin provides tissues like arteries and skin with elasticity and resilience.
  • Elastin and elastin-like peptides are hydrophobic, disordered, and self-assemble via liquid-liquid phase separation.
  • The precise structure of aggregated elastin remains a subject of scientific debate.

Purpose of the Study:

  • To elucidate the structural ensemble of aggregated elastin-like peptides using large-scale molecular dynamics simulations.
  • To resolve controversies surrounding the structure and function of elastin.
  • To gain insights into the phase separation of intrinsically disordered proteins.

Main Methods:

  • Massive-scale molecular dynamics simulations.
  • Analysis of structural ensembles of aggregated elastin-like peptides.
  • Investigation of hydrophobic interactions and hydrogen bonding within the assembled peptides.

Main Results:

  • The aggregated state of elastin peptides is stabilized by the hydrophobic effect, consistent with entropic elastic recoil.
  • Self-assembly does not lead to a distinct hydrophobic core.
  • The polypeptide backbone remains significantly hydrated, forming transient hydrogen bonds, while non-polar side chains increase contacts.
  • Individual chains adopt a maximally disordered, melt-like "liquid state".

Conclusions:

  • The study resolves long-standing controversies regarding elastin structure and function.
  • Findings suggest that the "liquid state" of proteins is key to elastin's properties.
  • Elastin self-assembly provides a model for understanding the phase separation of disordered proteins.