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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.
Ligaments and tendons are made of dense regular connective tissue, but in ligaments not all fibers are parallel. Dense regular elastic tissue contains elastin fibers and...
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pH-Responsive Elastin-Like Polypeptide Designer Condensates.

Robbert J de Haas1, Ketan A Ganar1, Siddharth Deshpande1

  • 1Department of Physical Chemistry and Soft Matter, Wageningen University and Research, 6708 WE Wageningen, The Netherlands.

ACS Applied Materials & Interfaces
|September 14, 2023
PubMed
Summary

Researchers developed pH-responsive elastin-like polypeptides (ELPs) that form synthetic biomolecular condensates. These engineered condensates enable precise control over cellular reactions, paving the way for advanced synthetic cell design.

Keywords:
biomolecular condensateselastin-like polypeptidesliquid−liquid phase separationpH-responsive coacervationsynthetic cells

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Area of Science:

  • Biochemistry
  • Synthetic Biology
  • Materials Science

Background:

  • Biomolecular condensates regulate cellular functions through liquid-liquid phase separation.
  • Stimuli-responsive synthetic condensates are essential for engineering synthetic cells with spatiotemporal control.
  • Designing such systems is key to mimicking biological compartmentalization.

Purpose of the Study:

  • To design and evaluate pH-responsive elastin-like polypeptides (ELPs) for creating synthetic condensates.
  • To investigate the characteristics of ELP-based condensates, including their response to pH and temperature.
  • To demonstrate the feasibility of using these condensates within synthetic cell compartments.

Main Methods:

  • Synthesis and characterization of a family of pH-responsive elastin-like polypeptides (ELPs).
  • Assessment of condensate formation triggered by specific pH ranges (4-7) and temperatures (20-37 °C).
  • Demonstration of mixed condensate formation within micron-sized vesicles and genetic fusion with cellular components.

Main Results:

  • ELPs formed condensates rapidly within sharp pH intervals (ΔpH < 0.3).
  • Condensation was observed across a physiological temperature range (20-37 °C) at critical pH values between 4 and 7.
  • Multiple ELP types successfully formed mixed condensates within vesicles, showing potential for functional integration.

Conclusions:

  • pH-responsive ELPs provide a tunable platform for creating synthetic biomolecular condensates.
  • These ELPs can be engineered into synthetic cells for spatiotemporal control of biochemical reactions.
  • The developed system offers a promising approach for pH-switchable functional compartments in synthetic biology.