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Complex coacervation effectively encapsulates proteins using synthetic polypeptides. Protein uptake depends on peptide properties and protein surface characteristics, guiding bioencapsulation design.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Protein Chemistry

Background:

  • Complex coacervation, a liquid-liquid phase separation (LLPS) process, is a promising method for protein encapsulation.
  • This technique allows for high protein loading while preserving protein structure and function.
  • Applications span the food, pharmaceutical, biocatalysis, and personal care industries.

Purpose of the Study:

  • To investigate how peptide charge density, charge patterning, and hydrophobicity influence protein partitioning during complex coacervation.
  • To understand the interactions between synthetic polypeptides and model proteins (hen egg white lysozyme and bovine serum albumin).

Main Methods:

  • Utilized a library of rationally designed synthetic polypeptides.
  • Systematically varied peptide charge density, charge patterning, and hydrophobicity.
  • Analyzed the partitioning of hen egg white lysozyme (HEWL) and bovine serum albumin (BSA) into coacervates.

Main Results:

  • Protein uptake was highly sensitive to the sequence features and hydrophobicity of the synthetic peptides.
  • HEWL partitioning was influenced by peptide charge density and patterning, interacting with localized charge patches.
  • BSA partitioning was driven by its hydrophobic character, favoring more hydrophobic coacervates.
  • Demonstrated a strong correlation between protein surface characteristics and coacervate properties.

Conclusions:

  • Spatial charge distribution and sequence composition of peptides critically govern protein-coacervate interactions.
  • Tailoring peptide design based on protein properties can optimize bioencapsulation efficiency.
  • Provides new design principles for developing advanced coacervate systems for bioencapsulation.