Random PCR-based screening for soluble domains using green fluorescent protein

Area of Science:

• Molecular Biology
• Protein Biochemistry
• Biotechnology

Background:

• Screening soluble protein domains is crucial for protein function studies and drug discovery.
• Existing methods for assessing protein solubility can be time-consuming and labor-intensive.
• Identifying soluble protein fragments is essential for structural biology and protein engineering.

Purpose of the Study:

• To develop a novel, rapid, and efficient method for screening soluble protein domains.
• To combine tagged random primer polymerase chain reaction (PCR) with a protein-folding assay using green fluorescent protein (GFP).
• To demonstrate the applicability of this method for identifying soluble protein fragments from complex proteomes.

Main Methods:

• Utilized a tagged random primer PCR method to amplify random DNA fragments from a template cDNA.
• Fused the amplified PCR products to the green fluorescent protein (GFP) gene.
• Assessed the solubility of translated proteins by monitoring the fluorescence of transformed Escherichia coli colonies on agar plates.

Main Results:

• Successfully cloned four soluble protein domains from the Vav protein using the developed method.
• Demonstrated the rapid monitoring of protein solubility through the fluorescence of bacterial colonies.
• Validated the efficiency and applicability of the combined PCR and GFP-based screening approach.

Conclusions:

• The presented method offers a novel and efficient approach for screening soluble protein domains.
• This technique integrates molecular amplification with a functional folding assay for high-throughput screening.
• The method is broadly applicable to any protein for which cDNA is available, facilitating proteomic and functional studies.