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Sequence Directionality Dramatically Affects LCST Behavior of Elastin-Like Polypeptides.

Nan K Li1, Stefan Roberts2, Felipe Garcia Quiroz3

  • 1Department of Materials Science and Engineering , North Carolina State University , 911 Partners Way , Raleigh , North Carolina 27695 , United States.

Biomacromolecules
|April 18, 2018
PubMed
Summary
This summary is machine-generated.

Elastin-like polypeptides (ELPs) show thermal responsive behavior. Sequence order significantly impacts ELP aggregation, with poly(VGPVG) exhibiting hysteresis due to stronger interchain bonding, unlike poly(VPGVG).

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Computational Biology

Background:

  • Elastin-like polypeptides (ELPs) are known for their inverse temperature (LCST) transition behavior in aqueous solutions.
  • Understanding the molecular mechanisms behind ELP phase transitions is crucial for designing smart biomaterials.

Purpose of the Study:

  • To investigate the thermal responsive properties of poly(VPGVG) and its reverse sequence poly(VGPVG).
  • To elucidate the molecular mechanisms controlling hysteretic phase behavior in ELPs using experimental and computational methods.

Main Methods:

  • Turbidity measurements (cloud point behavior)
  • Circular dichroism (CD) spectroscopy
  • All-atom molecular dynamics (MD) simulations

Main Results:

  • Both poly(VPGVG) and poly(VGPVG) exhibit a soluble-to-insoluble transition upon heating.
  • Poly(VPGVG) resolubilizes upon cooling, while poly(VGPVG) remains aggregated, showing thermal hysteresis.
  • MD simulations revealed sequence-dependent differences in residue dynamics, conformation, secondary structure propensity, and hydrophilicity, leading to stronger interchain hydrogen bonding in poly(VGPVG).

Conclusions:

  • The sequence order of ELPs critically influences their thermal phase behavior and aggregation properties.
  • Poly(VGPVG)'s enhanced hydrophilicity and extended conformation promote interchain interactions, causing significant thermal hysteresis.
  • These findings provide molecular insights into the design of sequence-specific, thermally responsive biomaterials.