Enhanced Enzyme Cascade Reactions Through Coencapsulation in Biocompatible Silica Nanoconfinement

Area of Science:

• Biochemistry
• Nanotechnology
• Enzyme Engineering

Background:

• Enzyme cascade reactions are vital for cellular metabolism.
• Spatial confinement of enzymes can improve cascade efficiency via proximity and substrate channeling.
• Mimicking natural metabolic organization is key for artificial enzyme systems.

Purpose of the Study:

• To coencapsulate glucose oxidase (GOX) and horseradish peroxidase (HRP) within silica nanocapsules (SiNCs).
• To investigate the effects of nanoscale confinement on enzyme activity, kinetics, and stability.
• To provide insights into the biochemical principles of multi-enzyme systems.

Main Methods:

• Enzyme-friendly synthesis of silica nanocapsules (SiNCs).
• Coencapsulation of glucose oxidase (GOX) and horseradish peroxidase (HRP).
• Michaelis-Menten kinetics analysis and thermal stability assays.

Main Results:

• Encapsulated enzymes retained high catalytic activity.
• Decreased Km for GOX indicated enhanced substrate affinity under confinement.
• Coencapsulated system showed faster cascade kinetics and improved thermal stability compared to separated enzymes.

Conclusions:

• Nanoscale confinement enhances enzyme cascade efficiency through proximity effects.
• Silica nanocapsules provide a platform for studying enzyme behavior under confinement.
• This approach offers insights into optimizing artificial multi-enzyme systems.