Immobilization and interfacial activation of lipase at liquid and solid interfaces

Area of Science:

• Biochemistry
• Biophysics
• Materials Science

Background:

• Enzyme immobilization enhances stability and reusability.
• Understanding lipase adsorption at interfaces is crucial for optimizing biocatalytic processes.
• Candida rugosa lipase is a key enzyme in lipid hydrolysis.

Purpose of the Study:

• To investigate the adsorption behavior of Candida rugosa lipase at silica/water and oil/water interfaces.
• To elucidate the relationship between adsorption orientation and enzymatic activity/selectivity.
• To provide molecular insights into lipase-mediated lipid hydrolysis.

Main Methods:

• Molecular dynamics simulations to study lipase adsorption.
• Tunnel calculations to assess catalytic triad accessibility.
• Docking simulations to predict substrate binding and selectivity.

Main Results:

• Lipase exhibits distinct adsorption orientations at silica/water and oil/water interfaces.
• At silica/water, the enzyme maintains partial catalytic triad access; at oil/water, tunnels are widely open.
• Simulations predict substrate selectivity based on chain length and chirality, with stable enzyme conformation upon immobilization.

Conclusions:

• Adsorption orientation dictates lipase activity and selectivity at different interfaces.
• Silica-immobilized lipase shows high catalytic potential and stability.
• Findings support the use of lipase immobilized in ceramic membranes for industrial lipolytic applications.