Polyelectrolyte Encapsulation and Confinement within Protein Cage-Inspired Nanocompartments

Area of Science:

• Biotechnology
• Nanotechnology
• Structural Biology

Background:

• Protein cages are well-defined nanocompartments with monodisperse size, formed from multiple subunits.
• Viral protein cages possess cationic interiors ideal for binding anionic nucleic acids, while non-viral cages accommodate diverse cargo.
• Functionalization via genetic or chemical modification enables targeted material entrapment.

Purpose of the Study:

• To review protein cages used for encapsulating polyelectrolyte cargos.
• To highlight the role of electrostatic interactions in protein cage assembly and cargo loading.
• To discuss the potential of protein cages in protective encapsulation for applications like drug/gene delivery and imaging.

Main Methods:

• Review of literature on native and modified protein cages.
• Analysis of electrostatic interactions driving protein cage-polyelectrolyte assembly.
• Exploration of functionalization strategies for targeted cargo entrapment.

Main Results:

• Protein cages, both native and engineered, effectively encapsulate polyelectrolyte cargos.
• Electrostatic interactions are the primary driving force for the assembly and cargo loading of protein cages.
• Modification of protein cage subunits facilitates multiple functional sites for enhanced entrapment.

Conclusions:

• Protein cages offer a versatile platform for selective encapsulation of polyelectrolytes.
• Encapsulation by protein cages protects cargo and can enhance its performance.
• Protein cages show significant promise for applications in drug delivery, gene delivery, and biomedical imaging.