Expression of proteins using Semliki Forest virus vectors

Area of Science:

• Molecular Biology
• Virology
• Cell Biology

Background:

• Semliki Forest virus (SFV) vectors provide a robust system for heterologous protein expression.
• SFV vectors enable protein production in a wide range of animal cell types.

Purpose of the Study:

• To present two distinct strategies for protein expression utilizing SFV vectors.
• To detail methods for generating recombinant RNA and achieving protein expression in cultured cells.

Main Methods:

• Cloning protein-coding sequences into plasmid vectors for recombinant RNA production.
• In vitro transcription to generate positive-polarity RNA for cell transfection.
• Two transfection strategies: direct cell transfection and in vivo packaging into SFV particles.
• Utilizing a self-encoded RNA replicase for RNA amplification and protein expression.

Main Results:

• Demonstrated successful protein expression in animal cells using SFV vectors.
• Provided protocols for direct protein expression analysis and indirect assessment via galactosidase assays.
• Established methods for producing, titrating, and purifying recombinant SFV particles for infection.

Conclusions:

• SFV vectors offer a flexible and efficient platform for protein expression across diverse cell types.
• The presented protocols facilitate the study of protein function and the development of gene-based applications.