Protein-Mediated Colloidal Assembly

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.