Encapsulation of gold nanoparticles into self-assembling protein nanoparticles

Area of Science:

• Nanotechnology
• Biotechnology
• Materials Science

Background:

• Gold nanoparticles possess valuable physical and chemical properties for biological applications.
• Functionalization with biomolecules enhances nanoparticle interactions and biological functions.
• Self-assembling protein nanoparticles (SAPNs) offer a novel method for gold nanoparticle encapsulation.

Purpose of the Study:

• To investigate the encapsulation of gold nanoparticles within self-assembling protein nanoparticles (SAPNs).
• To determine the key factors influencing successful gold nanoparticle encapsulation by SAPNs.

Main Methods:

• Utilized self-assembling protein nanoparticles (SAPNs) with a central cavity of approximately 10 nm.
• Encapsulated commercially available gold nanoparticles with varying hydrodynamic sizes and surface coatings.
• Analyzed the impact of gold nanoparticle size, surface coating, and electrostatic interactions on SAPN assembly and encapsulation.

Main Results:

• Successful encapsulation of gold nanoparticles with hydrodynamic sizes under 15 nm.
• Citrate-coated gold nanoparticles showed stronger interactions, potentially interfering with SAPN formation.
• Polymer-coated gold nanoparticles exhibited less interference with SAPN assembly.
• Electrostatic interactions within the SAPN cavity were less critical for efficient encapsulation.

Conclusions:

• SAPNs provide a viable method for encapsulating gold nanoparticles.
• SAPNs can be engineered with functional peptides or proteins for enhanced functionality.
• Encapsulation of gold nanoparticles into SAPNs creates a platform for developing multifunctional nanodevices.