Multifunctional Enzyme Packaging and Catalysis in the Qβ Protein Nanoparticle

Area of Science:

• Biotechnology and Nanotechnology
• Protein Engineering and Bioconjugation

Background:

• Virus-like particles (VLPs) offer a robust scaffold for encapsulating functional molecules.
• Controlling the internal loading and external display of proteins within VLPs remains a challenge.

Purpose of the Study:

• To develop a self-assembly method for creating enzyme-loaded VLPs with potential applications in medicine and chemical manufacturing.
• To investigate genetic modifications for controlling cargo density and explore simultaneous internal/external protein display.
• To establish a general platform for generating functional protein nanoparticles.

Main Methods:

• Co-expression of Qβ VLP capsid protein and Rev peptide-tagged protein cargo in Escherichia coli.
• Utilizing spontaneous self-assembly of VLPs around encapsulated cargo.
• Genetic engineering of the packaging system to modify cargo density and enable dual functionality (internal/external display).

Main Results:

• Successful packaging of four novel enzymes within VLPs, retaining enzymatic activity and enhanced stability.
• Demonstrated control over cargo packaging density through genetic modifications.
• Created VLPs displaying protein ligands externally while encapsulating enzymes internally.
• Observed inverse relationship between protein size (internal/external) and VLP yield.

Conclusions:

• A versatile and generalizable method for rapid, self-assembled protein nanoparticle production has been established.
• These engineered VLPs offer enhanced enzyme stability and customizable functionalities for targeted applications.
• The developed technology provides a robust platform for creating bimodal nanoparticles with catalytic and targeting capabilities.