[Construction and expression of anti-human CD3 single chain Fv antibody/human p53 tetramerization domain fusion gene]

To construct anti-human CD3 single chain Fv antibody (scFv)/human p53 tetramerization domain fusion gene and express the fusion protein in Hela cells.

The anti-human CD3 scFv was cloned into the previously constructed plasmid pUC18/IgG3/p53 to construct anti-human CD3 scFv /human p53 tetramerization domain fusion gene. After enzyme digestion analysis and sequencing, the fusion gene was subcloned into the expression plasmid pSecTag2-B. Then the plasmid pSecTag2-B containing the fusion gene was transfected into Hela cells. The expressed products were analyzed by SDS-PAGE and Western blot. The binding of the purified fusion protein to human peripheral blood mononuclear cells (PBMCs) was detected by flow cytometry.

DNA sequencing showed the fusion gene was constructed successfully. The expressed product of the fusion gene with a relative molecular mass (M(r)) about 35 000 was confirmed by SDS-PAGE and Western blot. The purified tetrameric anti-human CD3 scFv showed significantly stronger binding to PBMCs than scFv.

The tetrameric anti-human CD3 scFv which can bind to PBMCs has been successfully expressed and purified for potential use in clinical studies.