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The Journal of Immunology, Vol 141, Issue 10 3584-3591, Copyright © 1988 by American Association of Immunologists

ARTICLES

Molecular analysis of the gene encoding the major surface antigen of Toxoplasma gondii

JL Burg, D Perelman, LH Kasper, PL Ware and JC Boothroyd
Department of Microbiology and Immunology, Stanford University School of Medicine, CA 94305-5402.

The complete sequence of P30, the major surface Ag of the protozoan parasite, Toxoplasma gondii, has been deduced through the cloning and analysis of its gene. Using polyclonal serum specific for P30, we have isolated a P30 cDNA clone from a lambda gt11 cDNA expression library derived from tachyzoites of T. gondii (RH strain). This clone produces a beta-galactosidase fusion protein which reacts with several anti-P30 mAb. In addition, polyclonal anti-serum raised to the fusion protein reacts with purified P30 protein and exclusively with P30 in a whole cell lysate of T. gondii. This cDNA clone was used to isolate near full- length cDNA molecules and a cosmid clone containing the P30 gene. Sequence analysis of the cDNA reveals a single open reading frame with coding capacity for 34.7 kDa of primary translation product (consistent with the apparent Mr of P30 on SDS-acrylamide gels) including a presumptive hydrophobic signal sequence. The P30 primary translation product also has a carboxy-terminal hydrophobic tail which is predictive of a posttranslational cleavage and modification with a glycolipid anchor. We have identified the apparent 5' and 3' ends of the P30 mRNA transcript which is extremely abundant, 1500 nucleotides in length, and polyadenylated. The P30 gene is single copy and contains no introns.


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