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Generation of an expression library in the baculovirus expression vector system
V K Ward1, S B Kreissig, B D Hammock
1Antibody Engineering Laboratory, University of California, Davis 95616, USA.
Journal of Virological Methods
|June 1, 1995
Summary
Researchers developed a novel baculovirus expression vector system to create and screen a cDNA library for antibody fragments. This method efficiently identifies antibody fragments reactive to tetanus toxoid, demonstrating feasibility for difficult protein expression.
Area of Science:
- Molecular Biology
- Immunotechnology
- Biotechnology
Background:
- Developing efficient methods for antibody fragment discovery is crucial for therapeutic and diagnostic applications.
- Traditional expression systems can be challenging for certain proteins, including antibody heavy chains.
- The baculovirus expression vector system offers a powerful platform for eukaryotic protein production.
Purpose of the Study:
- To construct and screen a cDNA library using the baculovirus expression vector system.
- To identify antibody heavy chain fragments reactive to tetanus toxoid.
- To assess the feasibility of direct screening of baculovirus expression libraries for functional antibody fragments.
Main Methods:
- Construction of a 2 x 10(4) clone cDNA library in a baculovirus vector system.
- Isolation of antibody heavy chain sequences from a mouse spleen immunized with tetanus toxoid fragment C.
- Screening of recombinant baculoviruses for antibody fragments reactive to tetanus toxoid without prior Escherichia coli expression.
- Confirmation of positive clones via expression as beta-lactamase fusion proteins in E. coli.
Main Results:
- A diverse cDNA library was successfully constructed and screened in the baculovirus system.
- At least 6 different antibody populations reactive to tetanus toxoid were identified within a pool of 30 clones.
- Positive clones were confirmed to produce tetanus-reactive antibody fragments.
- The baculovirus system demonstrated feasibility for expressing and screening difficult protein targets like antibody heavy chain fragments.
Conclusions:
- The construction and screening of baculovirus expression cDNA libraries are feasible, even for challenging proteins.
- The baculovirus expression vector system can be directly screened for desired protein activity, streamlining antibody discovery.
- This approach holds significant potential for generating and identifying functional antibody fragments.