Protein production with recombinant baculoviruses in lepidopteran larvae

Area of Science:

• Biotechnology
• Molecular Biology
• Protein Expression

Background:

• The demand for functional protein analysis necessitates efficient and economical production methods.
• Baculovirus expression systems commonly use cultured insect cells, but alternatives are sought.
• Insect larvae present a low-cost, scalable option for recombinant protein production.

Purpose of the Study:

• To evaluate the use of Trichoplusia ni larvae as a host for recombinant protein production.
• To explore and compare three distinct methods of baculovirus administration to T. ni larvae.
• To assess the feasibility of achieving small-to mid-scale protein yields (mg-g) using larvae.

Main Methods:

• Three methods of virus administration to Trichoplusia ni larvae were investigated: injection, oral inoculation, and direct transfection with viral DNA.
• The first two methods require prior generation of recombinant virus in cultured insect cells.
• The third method bypasses the need for cultured insect cells by transfecting larvae directly.

Main Results:

• Trichoplusia ni larvae can be effectively infected with baculovirus for recombinant protein production.
• Different administration methods offer varying levels of labor intensity and scalability.
• Oral inoculation and DNA transfection present more scalable options compared to injection.
• Successful protein production at the mg-g scale was demonstrated in T. ni larvae.

Conclusions:

• Live insect larvae, specifically Trichoplusia ni, serve as a viable and cost-effective alternative to traditional bioreactors for recombinant protein production.
• The choice of virus administration method impacts scalability and resource requirements.
• Direct DNA transfection offers a cell-free approach for large-scale protein expression in larvae.
• Larval-based expression systems provide a practical solution for small-to mid-scale recombinant protein needs.