Optimization and quantification of protein synthesis inside liposomes.

Area of Science:

• Synthetic biology
• Biochemistry
• Cell-free systems

Background:

• Synthetic biology seeks to create artificial cells with tailored functions.
• Encapsulating biochemical reactions in cell-sized compartments like liposomes is crucial for artificial cell development.
• Previous methods showed poor protein synthesis yields within liposomes.

Purpose of the Study:

• To optimize intraliposomal cell-free protein synthesis (CFPS).
• To quantify protein production before and after optimization using an activity-based assay.
• To demonstrate the potential for microgram-scale protein production within liposomes.

Main Methods:

• Optimization of lipid composition, liposome, pyrophosphatase, and T7 RNA polymerase concentrations.
• Entrapment of cell-free protein-synthesis systems and DNA templates within liposomes.
• Quantification of full-length protein production using an activity-based assay with beta-galactosidase as a model protein.

Main Results:

• Optimized intraliposomal CFPS significantly improved protein yields.
• Microgram quantities of functional protein (30-40 microg/mL liposomes) were produced.
• Demonstrated successful de novo protein synthesis within liposomes.

Conclusions:

• Optimized intraliposomal CFPS is a viable method for producing functional proteins at microgram scales.
• This advancement is critical for the development of artificial cells.
• Enhanced protein synthesis within liposomes opens new avenues in synthetic biology.