Methods for rapid identification of a functional single-chain variable fragment using alkaline phosphatase fusion

Area of Science:

• Biotechnology
• Immunology
• Molecular Biology

Background:

• Generating functional recombinant antibodies from hybridomas is crucial for antibody engineering.
• Aberrant heavy and light chain mRNAs complicate this process, necessitating selective technologies.
• Existing methods are often complex and difficult to operate.

Purpose of the Study:

• To develop a simple and effective method for identifying functional recombinant antibodies derived from hybridomas.
• To utilize alkaline phosphatase (AP)-fused single-chain variable fragment (scFv) for this identification.
• To demonstrate the utility of scFv-AP fusion protein as an immuno-detective reagent.

Main Methods:

• Cloned the scFv gene from a hybridoma producing mouse IgG against branched-chain keto acid dehydrogenase complex-E2 (BCKD-E2).
• Inserted the scFv gene into an expression vector with an in-frame phoA gene, creating an scFv-AP fusion.
• Employed conventional enzyme-linked immunosorbent assay (ELISA) for identification.

Main Results:

• Successfully generated and identified functional recombinant antibodies using the scFv-AP fusion strategy.
• The scFv-AP fusion protein facilitated simple and straightforward identification of functional antibodies.
• The fusion protein also proved effective as a valuable immuno-detective reagent.

Conclusions:

• The scFv-AP fusion method provides a simplified approach for identifying functional recombinant antibodies from hybridomas.
• This technique overcomes the challenges associated with aberrant mRNA levels.
• scFv-AP fusion proteins are versatile tools for antibody engineering and detection.