Charge-switchable gold nanoparticles for enhanced enzymatic thermostability

Area of Science:

• Biotechnology and Nanomaterials Science
• Enzyme Engineering and Immobilization

Background:

• Enzyme immobilization is crucial for enhancing stability and reusability in industrial applications.
• Developing cost-effective and efficient immobilization strategies remains a significant challenge.

Purpose of the Study:

• To develop a facile strategy for efficient enzyme immobilization on metal nanoparticles.
• To enhance enzyme thermostability and retain enzymatic activity post-immobilization.
• To explore the use of zwitterionic amino acids for tailored nano-bio interfaces.

Main Methods:

• Synthesis of gold nanoparticles using tyrosine as a reducing and capping agent.
• Immobilization of phytase enzyme onto gold nanoparticles via charge-switchable electrostatic interactions.
• Kinetic and thermodynamic studies to evaluate the performance of immobilized phytase.

Main Results:

• Efficient immobilization of phytase on gold nanoparticles was achieved.
• Immobilized phytase exhibited enhanced thermostability and retained high enzymatic activity.
• Reduced activation energy and a broader operational temperature window were observed for immobilized phytase.

Conclusions:

• The zwitterionic nature of amino acids offers a versatile platform for enzyme immobilization.
• This strategy significantly improves enzyme quality, reducing energy requirements for substrate hydrolysis.
• The findings provide opportunities for rational design of nano-bio interfaces for diverse biological applications.