Coiled-Coil Protein Origami: Design, Isolation, and Characterization

Area of Science:

• Protein engineering and structural biology.
• De novo protein design and self-assembly.
• Nanotechnology and biomaterials.

Background:

• Coiled-coil protein origami (CCPO) is a de novo protein design strategy.
• CCPO constructs polyhedral nano-cages by concatenating coiled-coil segments.
• Previous CCPO designs include tetrahedral, square pyramidal, trigonal prismatic, and trigonal bipyramidal cages.

Purpose of the Study:

• To provide a comprehensive guide to the CCPO methodology.
• To facilitate the development and application of CCPO-based protein scaffolds.
• To cover the entire workflow from design to characterization.

Main Methods:

• Protein design using CoCoPOD, an integrated platform.
• Gene cloning via modified Golden-gate assembly.
• Protein expression, isolation (NiNTA, Strep-trap, IEX, SEC), and characterization (CD, SEC-MALS, SAXS).

Main Results:

• Demonstration of a complete workflow for CCPO creation.
• Successful application of design, cloning, expression, purification, and characterization techniques.
• Established CCPO protein scaffolds with favorable biophysical properties for functionalization.

Conclusions:

• CCPO offers a versatile platform for creating custom protein nano-cages.
• The presented guide provides a standardized approach for CCPO development.
• Designed CCPO structures hold significant potential for diverse biotechnological applications.