A positive Selection Escherichia Coli Recombinant Protein Expression Vector for One-Step Cloning

Area of Science:

• Molecular Biology
• Biotechnology
• Synthetic Biology

Background:

• Gene cloning is essential for molecular biology research and biotechnology applications.
• Current methods for screening gene inserts and their orientation can be time-consuming and labor-intensive.
• Efficient vector systems are needed to streamline cloning workflows.

Purpose of the Study:

• To introduce OLIVAR (orientation selection of insert in vector through antisense reporter) as a novel selection strategy for gene insertion.
• To engineer the pGRASS plasmid vector as a proof-of-concept for the OLIVAR strategy.
• To demonstrate a simplified and efficient gene cloning and screening system.

Main Methods:

• Development of the pGRASS plasmid vector utilizing an antisense reporter system.
• Application of blunt-end cloning for gene insertion into the pGRASS vector.
• Screening of bacterial clones for successful insertion and correct orientation of the gene of interest.

Main Results:

• The pGRASS vector enables effortless distinction between positive and negative clones after blunt-end cloning.
• The system screens not only for the presence of an insert but also for its correct orientation.
• The cloning workflow was reduced to a single, 2-hour reaction at room temperature.

Conclusions:

• OLIVAR and the pGRASS vector provide a cost-effective and straightforward cloning-cum-screening system.
• This system significantly simplifies the process of inserting protein-coding genes into vector backbones.
• The strategy has potential applications in various domains, including phage display and library construction.