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Peptide coacervates show promise in biomedicine. Modifying peptide sequences alters their microenvironment and biological function, offering new avenues for materials science and therapeutic development.

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Area of Science:

  • Biomaterials Science
  • Biomedical Engineering
  • Molecular Biology

Background:

  • Peptide-based coacervates offer tunable properties for biomedical and materials science applications.
  • Challenges remain in controlling coacervate microenvironments and biological functions due to complex interactions.

Purpose of the Study:

  • To investigate how substituting specific amino acids (aspartic acid with phenylalanine, lysine with arginine) in decapeptides affects coacervate microenvironments and functions.
  • To establish structure-property relationships for designing functional peptide coacervates.

Main Methods:

  • Synthesis and characterization of decapeptide sequences (R10, K10, D10) and their modified variants.
  • Analysis of coacervate phase behavior, thermodynamics, microenvironment polarity, and molecular mobility.
  • Assessment of biological macromolecule enrichment, DNA secondary structure, and cell-based functional assays (adhesion, proliferation).

Main Results:

  • Replacing aspartic acid with phenylalanine in R10/D10 coacervates shifted phase separation from enthalpy- to entropy-driven, increasing salt resistance and reducing polarity/mobility.
  • Lysine to arginine substitutions in K10/D10 coacervates had minimal impact on viscosity and polarity but stabilized droplets.
  • Neither substitution affected macromolecule enrichment, but D-to-F substitution disrupted DNA secondary structure; R10/D10 showed stronger cell proliferation inhibition.

Conclusions:

  • Peptide sequence modification significantly impacts coacervate microenvironment properties and biological outcomes.
  • Understanding these sequence-dependent changes is crucial for designing advanced peptide coacervates for specific applications.
  • This study provides a molecular basis for tailoring peptide coacervates for targeted biomedical and materials science functions.