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Synthesis and Characterization of Supramolecular Colloids
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Protein-Mediated Colloidal Assembly.

Maiko Obana1, Bradley R Silverman1, David A Tirrell1

  • 1Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States.

Journal of the American Chemical Society
|September 13, 2017
PubMed
Summary
This summary is machine-generated.

Researchers used protein-protein interactions to program colloidal assembly of microparticles. This versatile method allows for tunable aggregate sizes and orthogonal assembly for advanced materials science and biotechnology applications.

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Area of Science:

  • Materials Science
  • Biotechnology
  • Biophysics

Background:

  • Programmable colloidal assembly is crucial for bottom-up materials fabrication.
  • DNA oligonucleotides are commonly used, but proteins offer more diverse functionalities.
  • Proteins have not been widely explored to direct colloidal assembly.

Purpose of the Study:

  • To investigate the use of protein-protein interactions for directed colloidal assembly.
  • To demonstrate tunable and orthogonal assembly of microparticles using proteins.
  • To explore the formation of complex colloidal structures using protein-mediated interactions.

Main Methods:

  • Utilized reversible coiled-coil interactions and irreversible intermolecular isopeptide linkages between proteins immobilized on microparticles.
  • Controlled aggregate size by adjusting the concentration of surface-immobilized proteins.
  • Demonstrated orthogonal assembly by using distinct protein pairs for particle association.
  • Investigated the disassembly of protein-linked aggregates using chemical denaturants and competing proteins.
  • Assembled complex core-shell structures using protein-protein interactions.

Main Results:

  • Achieved controlled aggregation of polystyrene microparticles driven by protein-protein interactions.
  • Demonstrated tunable aggregate sizes based on protein concentration.
  • Showcased orthogonal assembly capabilities with different protein pairs.
  • Confirmed that coiled-coil linked aggregates are reversible, unlike isopeptide linked aggregates.
  • Successfully constructed complex core-shell colloidal aggregates.

Conclusions:

  • Protein-protein interactions provide a versatile and programmable strategy for colloidal assembly.
  • This approach enables the engineering of mesoscale materials with tunable properties.
  • The findings have significant implications for materials science and biotechnology applications.