[Preparation and identification of rat anti-human ErbB3 dimerization domain polyclonal antibody]

Area of Science:

• Biotechnology
• Immunology
• Molecular Biology

Background:

• The human epidermal growth factor receptor 3 (ErbB3) plays a crucial role in cellular signaling pathways.
• Targeting ErbB3 is a significant area of research for therapeutic interventions.

Purpose of the Study:

• To construct and express a novel fusion protein, MVF-ErbB3II, combining measles virus fusion (MVF) protein and ErbB3 peptides.
• To generate and characterize a polyclonal antibody (pcAb) against the MVF-ErbB3II fusion protein.

Main Methods:

• Artificial gene synthesis and subcloning of MVF-ErbB3II into pET-21b plasmid.
• Recombinant protein expression in E. coli, followed by purification using nickel ion affinity chromatography.
• Immunization of rats with purified MVF-ErbB3II to produce anti-MVF-ErbB3II pcAb, with characterization via ELISA, Western blotting, immunoprecipitation, and flow cytometry.

Main Results:

• Successful prokaryotic expression and purification of the MVF-ErbB3II fusion protein confirmed by SDS-PAGE.
• High titer (1:1,024,000) of anti-MVF-ErbB3II pcAb demonstrated by ELISA.
• The generated pcAb exhibited specific binding to MVF-ErbB3II and native ErbB3, and importantly, targeted the ErbB3 dimerization interface, as shown by Western blotting, IP, and FCM.

Conclusions:

• The study successfully achieved prokaryotic expression and purification of the MVF-ErbB3II fusion protein.
• A rat anti-MVF-ErbB3II pcAb was successfully prepared and characterized.
• The developed antibody demonstrates specificity and targets the ErbB3 dimerization interface, indicating its potential utility in ErbB3-related research.