Improving lipase activity by immobilization and post-immobilization strategies

Area of Science:

• Biocatalysis
• Enzyme Engineering
• Industrial Chemistry

Background:

• Lipase catalysts are crucial in chemical industries, with specific activity being a key performance parameter.
• Enhancing lipase activity is essential for optimizing industrial processes and expanding substrate scope.

Purpose of the Study:

• To review and present strategies for enhancing lipase activity, focusing on immobilization and modification techniques.
• To highlight methods that increase lipase specific activity for both natural and unnatural substrates.

Main Methods:

• Enzyme immobilization on hydrophobic supports via interfacial adsorption at low ionic strength.
• Utilizing hydrophobic additives (surfactants, ionic liquids) with macroporous supports or soluble enzymes.
• Site-directed chemical modification, including glycosylation and disulfide exchange with tailored polymers.

Main Results:

• Interfacial adsorption led to 1.2- to 20-fold activity increases by stabilizing the open enzyme conformation.
• Additives enhanced immobilized lipase activity up to eightfold and soluble lipases over 100-fold.
• Chemical modifications offer further avenues for activity enhancement in immobilized lipases.

Conclusions:

• Multiple strategies effectively enhance lipase activity for industrial applications.
• Immobilization and modification techniques provide significant improvements in enzyme performance and stability.
• These advancements enable broader and more efficient use of lipases in biocatalysis.