Enzymes inside lipid vesicles: preparation, reactivity and applications

Area of Science:

• Biochemistry and Biophysics
• Materials Science
• Nanotechnology

Background:

• Enzyme-containing lipid vesicles (liposomes) are crucial for various applications, including drug delivery and diagnostics.
• Liposome preparation methods vary, influencing vesicle properties like size, lamellarity, and enzyme encapsulation efficiency.
• Phosphatidylcholine is a common vesicle-forming amphiphile, often modified with charged lipids to influence enzyme interaction.

Purpose of the Study:

• To review and summarize methods for preparing enzyme-containing lipid vesicles.
• To evaluate the suitability of different preparation techniques for specific applications, such as enzyme replacement therapy and nanoreactors.
• To highlight challenges and future directions in understanding enzyme activity within liposomes.

Main Methods:

• Review of existing literature on enzyme-liposome preparation techniques.
• Comparison of vesicle-forming amphiphiles, including phosphatidylcholine derivatives and charged lipids.
• Evaluation of the dehydration-rehydration method combined with extrusion for superior vesicle characteristics.

Main Results:

• The dehydration-rehydration method followed by extrusion yields high enzyme encapsulation, avoids organic solvents, and produces monodisperse, unilamellar vesicles (~100 nm).
• Charged lipids can influence enzyme adsorption to vesicle bilayers.
• Sterically stabilized liposomes are advantageous for in vivo applications as enzyme carriers.

Conclusions:

• The dehydration-rehydration and extrusion techniques are superior for producing specific enzyme-liposome characteristics.
• Enzyme-containing liposomes have diverse applications, from cheese production to advanced medical therapies and nanoreactors.
• Further research is needed for a detailed molecular understanding of enzyme catalysis within liposomes and their modeling.