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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
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Self-assembly of α-helical polypeptides driven by complex coacervation.

Dimitrios Priftis1, Lorraine Leon1, Ziyuan Song2

  • 1Institute for Molecular Engineering, University of Chicago, Chicago, IL 60637 (USA).

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|September 10, 2015
PubMed
Summary

Chiral polypeptides can self-assemble into liquid complexes, forming nanoscale coacervate-core micelles. This controlled assembly offers enhanced salt resistance and potential for delivering biological molecules.

Keywords:
chiralityhelical structuresmicellespeptidesself-assembly

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Area of Science:

  • Polymer Science
  • Biomaterials Science
  • Supramolecular Chemistry

Background:

  • Polypeptide complexation typically forms solid states due to beta-sheet formation, influenced by chirality.
  • Controlling polypeptide secondary structure is key to achieving liquid complex formation.

Purpose of the Study:

  • To investigate the self-assembly of alpha-helical polypeptides with oppositely charged polypeptides.
  • To create nanoscale coacervate-core micelles using functionalized alpha-helical polypeptides.
  • To explore the impact of alpha-helical structure on polypeptide complex properties.

Main Methods:

  • Self-assembly of oppositely charged polypeptides.
  • Coupling alpha-helical polypeptides to neutral hydrophilic polymers.
  • Characterization of nanoscale coacervate-core micelles.

Main Results:

  • Achieved liquid polypeptide complexes that maintain alpha-helical secondary structure.
  • Formation of nanoscale coacervate-core micelles through polymer-polypeptide complexation.
  • Demonstrated enhanced salt resistance in the formed complexes due to higher charge density.

Conclusions:

  • Alpha-helical structure prevents beta-sheet formation, enabling liquid coacervate formation between chiral components.
  • The developed materials show potential for enhanced delivery of biologically relevant molecules.
  • This work expands the utility of fluid polypeptide complexes in biomaterial applications.