Genetic modification of a baculovirus vector for increased expression in insect cells

Area of Science:

• Molecular Biology
• Biotechnology
• Virology

Background:

• The baculovirus expression vector system (BEVS) is a powerful tool for high-level recombinant protein production in insect cells.
• Traditional methods often involve genetically unmodified Autographa californica multi-nucleopolyhedovirus (AcMNPV), limiting optimization potential.

Purpose of the Study:

• To enhance recombinant protein yield by genetically modifying the AcMNPV genome.
• To investigate the impact of deleting non-essential genes on protein production and cell viability.

Main Methods:

• Deletion of p26, p10, and p74 genes from the AcMNPV genome.
• Use of an antibiotic selection cassette for recombinant virus isolation.
• Screening and identification via restriction enzyme analysis, PCR, and Western blot.
• Assessment of cell viability and recombinant protein expression levels.

Main Results:

• Deletion of non-essential genes did not improve infected cell viability.
• Recombinant protein expression levels were significantly higher in modified viruses compared to wild-type.
• Confirmed the potential for improving BEVS through genetic manipulation.

Conclusions:

• Genomic modification of AcMNPV by deleting specific non-essential genes can substantially increase recombinant protein yields.
• Further optimization of the BEVS is feasible for enhanced protein production and stability in insect cell systems.