creators_name: Yee, Wai-Yan, creators_name: Wah, Kiew-Lian, type: article datestamp: 2008-07-03 05:39:17 lastmod: 2008-07-03 05:39:17 metadata_visibility: show corp_creators: Universiti Kebangsaan Malaysia. Faculty of Science and Technology. School of Bioscience and Biotechnology corp_creators: Universiti Kebangsaan Malaysia. Faculty of Science and Technology. School of Bioscience and Biotechnology title: Integration of the Toxoplasma gondii MIC2 Gene Into the Pichia pastoris Genome ispublished: pub subjects: Q subjects: R full_text_status: none keywords: MIC2, microneme, eukaryotic expression vector, Pichia pastoris note: This project was funded by a grant from MPKSN (IRPA 09-02-02-0055). abstract: The Toxoplasma gondii MIC2 gene encodes a microneme protein that is believed to play an important role in the adhesion of the parasite to its host cell. Since the Pichia pastoris expression system is capable of producing biologically active foreign proteins, expression of recombinant MIC2 in this yeast will potentially provide useful MIC2 material for functional studies of this protein. As a prior effort to utilise this eukaryotic expression system in the study of MIC2, we have integrated the MIC2 gene into the genome of P. pastoris. Amplification of the MIC2 gene was carried out using the polymerase chain reaction (PCR) technique and cloned into the pCR2.1 vector. The resulting pCR2.1-MIC2 recombinant plasmid was transformed into the Escherichia coli TOP 10 strain. Positive colonies were determined by DNA plasmid analysis. The pCR2.1-MIC2 recombinant plasmid was isolated, and digested with EcoRI and XbaI restriction enzymes. The MIC2 fragment was then purified and cloned into the pPICZ B expression vector. The resulting pPICZ-MIC2 recombinant plasmid was transformed into the E. coli DH5α strain. Positive transformants were determined by PCR analysis. The pPICZ-MIC2 recombinant plasmid was extracted, linearised and transformed into P. pastoris via electroporation. The integration of MIC2 into the P. pastoris genome was subsequently demonstrated by PCR. date: 2005 date_type: published publication: Malaysian Journal of Biochemistry and Molecular Biology volume: 11 number: 1 publisher: Malaysian Society for Biochemistry and Molecular Biology pagerange: 42-45 refereed: TRUE issn: ISSN 1511-2616 official_url: http://ejum.fsktm.um.edu.my/ArticleInformation.aspx?ArticleID=622 referencetext: 1. Dubey JP, Beattie CP. Toxoplasmosis of animals and man. Boca Raton: CRC Press. 1988. 2. Wan, KL, Carruthers VB, Sibley LD, Ajioka JW. Molecular characterisation of an expressed tag locus of Toxoplasma gondii encoding the micronemal protein MIC2. Mol Biochem Parasitol 1997; 84: 203-214. 3. Robson KJH, Hall JRS, Jennings MW, Harris TJR, Marsh K, Newbold CI, Tate VE, Weatherall DJ. A highly conserved amino acid sequence in thrombospondin, properdin and inproteins from sporozoites and blood stages of a human malaria parasite. Nature 1988; 335: 79-82. 4. Tomley FM, Clarke LE, Kawazoe U, Dijkema R, Kok JJ. Sequence of the gene encoding an immunodominant microneme protein of Eimeria tenella. Mol Biochem Parasitol 1991; 49: 277-288. 5. Lin Cereghino J, Cregg JM. Heterologous protein expression in the methylotrophic yeast Pichia pastoris. FEMS Microbiol Rev 2000; 24: 45-66. 6. Harper JM, Hoff EF, Carruthers VB. Multimerization of the oxoplasma gondii MIC2 integrin-like A-domain is required for binding to heparin and human cells. Mol Biochem Parasitol 2004; 134: 201-212. 7. Wan KL, Blackwell JM, Ajioka JW. Toxoplasma gondii expressed sequence tags: insights into tachyzoite gene expression. Mol Biochem Parasitol 1996; 75: 179-186. 8. Kocken CHM, Withers-Martinez C, Dubbeld MA, van der Wel A, Hackett F, Blackman MJ, Thomas AW. High-level expression of the malaria blood-stage vaccine candidate Plasmodium falciparum apical membrane antigen 1 and induction of antibodies that inhibit erythrocyte invasion. Infect Immun 2002; 70: 4471-4476. 9. Zou L, Miles AP, Wang J, Stowers AW. Expression of malaria transmission-blocking vaccine antigen Pfs25 in Pichia pastoris for use in human clinical trails. Vaccine 2003; 21: 1650-1657. 10. Yadava A, Ockenhouse CF. Effect of codon optimization on expression levels of a functionally folded malaria vaccine candidate in prokaryote and eukaryote expression systems. Infect Immun 2003; 71: 4961-4969. citation: Yee, Wai-Yan, and Wah, Kiew-Lian, (2005) Integration of the Toxoplasma gondii MIC2 Gene Into the Pichia pastoris Genome. Malaysian Journal of Biochemistry and Molecular Biology, 11 (1). pp. 42-45. ISSN ISSN 1511-2616