Tehran University of Medical Sciences Iranian Journal of Parasitology 1735-7020 7 3 2012 09 15 48 53 EN K Khanaliha Department of Parasitology and Mycology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran AND Cellular and Molecular Biology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran MH Motazedian Department of Parasitology and Mycology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran B Sarkari Department of Parasitology and Mycology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran M Bandehpour Cellular and Molecular Biology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran AND Biotechnology Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran Z Sharifnia Cellular and Molecular Biology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran AND Biotechnology Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran B Kazemi Cellular and Molecular Biology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran AND Biotechnology Department, Shahid Beheshti University of Medical Sciences, Tehran, Iran 2015 10 03 Background: Toxoplasma gondii is an obligate intracellular protozoan parasite, capable of infecting all species of mammals including man. Congenital toxoplasmosis is more important during pregnancy for the first time. In this study we expressed and purified P43 Toxoplasma gondii tachyzoite and bradyzoite specific surface antigen. Methods: The recombinant pGEMEX-1 contained Toxoplasma P43 coding sequence was transformed into E. coli and mass cultured in LB medium contained 100 μg/ml ampicillin at 37°C over night .The T7 promoter was induced by 1mM isopropyl-1-thio-ß-D-galactopyranoside (IPTG. Recombinant protein was purified by affinity chromatography and confirmed by gel diffusion dot blot and western blot,-using specific anti Toxoplasma antibodies. Results: Recombinant plasmid was induced by IPTG and analyzed by SDS-PAGE. Recombinant protein was confirmed by Western-blot and dot blot using anti human Toxoplasma antibody. Conclusion: Recombinant Toxoplasma P43 was produced successfully. https://ijpa.tums.ac.ir/index.php/ijpa/article/view/252 https://ijpa.tums.ac.ir/index.php/ijpa/article/download/252/251