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GRA3 is a 30-kDa protein located inside the dense granules of Toxoplasma gondii. Following invasion and exocytosis of dense granules within the parasitophorous vacuole, GRA3 becomes associated with the parasitophorous vacuolar membrane (PVM) and extensions of the PVM which protrude into the cytoplasm. A partial cDNA encoding GRA3 was isolated from a(More)
Three microneme proteins of Toxoplasma gondii have been characterized using 3 monoclonal antibodies and a recombinant protein specific antiserum. In all cases, apical labeling of tachyzoites and bradyzoites was observed by indirect immunofluorescence assay. Immunogold localization on ultrathin sections of bradyzoites or tachyzoites showed a specific(More)
The cDNA encoding the Toxoplasma gondii microneme protein MIC1 and the corresponding gene have been cloned and sequenced. The MIC1 gene contains three introns. The cDNA encodes a 456 amino acid (aa) sequence, with a typical signal sequence and no other trans-membrane domain. The protein contains a tandemly duplicated domain with conservation of cysteines(More)
The biosynthesis and fate of 4 different dense granule proteins of Toxoplasma gondii were studied with 3 monoclonal antibodies raised against tachyzoites and 1 polyclonal antibody raised against a recombinant protein. These proteins have the following molecular weights: 27 kDa (GRA 1), 28 kDa (GRA 2), 30 kDa (GRA 3) and 40 kDa (GRA 4). All four proteins(More)
Clones which were selected from a Toxoplasma gondii expression library with the immune serum from a T. gondii-infected rabbit, were further screened using milk and intestinal secretions from mice which had been orally infected with T. gondii cysts. The gene products of several clones reacted strongly with milk IgA and weakly with intestinal IgA. Three of(More)
A striking feature of toxoplasmic seroconversion is the prominent and early IgM response to a low molecular weight antigen of 4-5 kDa. Two different monoclonal antibodies directed against the 4-5 kDa antigen have been generated and used to characterize this molecule. Using these monoclonal antibodies, we could demonstrate the surface localization of the low(More)
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