Protein Cages as Containers for Gold Nanoparticles

Area of Science:

• Nanotechnology
• Materials Science
• Biotechnology
• Virology

Background:

• Viruses serve as versatile scaffolds in nanotechnology for material synthesis and organization.
• Cowpea chlorotic mottle virus (CCMV) protein cages offer potential for encapsulating nanoparticles.

Purpose of the Study:

• To utilize CCMV protein cages for encapsulating gold nanoparticles (AuNPs) of varying sizes and stabilizing ligands.
• To develop an efficient, one-step method for creating stable, virus-like particles containing AuNPs.

Main Methods:

• Employing the coat protein of CCMV to form virus-like particles (VLPs) with T = 1, 2, and 3 Caspar-Klug triangulation numbers.
• Encapsulating commercially available gold nanoparticles without prior modification into CCMV VLPs.
• Optimizing encapsulation efficiency using bis-p-(sulfonatophenyl)phenyl phosphine surfactants.

Main Results:

• Achieved high encapsulation efficiency, up to 97%, for gold nanoparticles within CCMV protein cages.
• Further increased encapsulation efficiency to 99% using specific phosphine surfactants.
• Produced stable metallic particles within CCMV protein cages, functional in buffered solutions at neutral pH.

Conclusions:

• Demonstrated a simplified, highly efficient procedure for preparing gold nanoparticle-loaded CCMV protein cages.
• The developed virus-based colloids are stable and suitable for various nanotechnology applications.
• This method facilitates the creation of diverse virus-based nanomaterials for current research focus areas.