Semi-artificial and bioactive ferroxidase with nanoparticles as the active sites

Area of Science:

• Bioinorganic chemistry
• Nanotechnology
• Biochemistry

Background:

• Apoferritin is a protein cage for iron storage.
• Light-chain apoferritin (LCA) lacks intrinsic ferroxidase activity.
• Heavy-chain apoferritin (HCA) possesses ferroxidase activity but has limitations.

Purpose of the Study:

• To engineer a hybrid bioinorganic nanoparticle with enhanced ferroxidase activity.
• To evaluate the performance of LCA supplemented with platinum nanoparticles (Pt-NPs).
• To assess the potential of the hybrid nanoparticle in regulating cellular iron homeostasis.

Main Methods:

• Synthesis of LCA-Pt-NP hybrid nanoparticles.
• Characterization of ferroxidase activity and iron mineralization.
• Assessment of stability and inhibition resistance.
• Evaluation of nanoparticle activity within a cellular environment.

Main Results:

• LCA-Pt-NP hybrid nanoparticles exhibit significant ferroxidase activity.
• The hybrid nanoparticle demonstrates superior iron mineralization compared to HCA.
• Enhanced resistance to inhibition and stability were observed in the hybrid system.
• The LCA-Pt-NP nanoparticle effectively regulates iron homeostasis in cells.

Conclusions:

• Platinum nanoparticle supplementation restores and enhances ferroxidase activity in light-chain apoferritin.
• The resulting bioinorganic hybrid nanoparticle offers a promising platform for iron management.
• This approach provides a novel strategy for controlling cellular iron levels.