Nevertheless, the epitope of MTP acknowledged by MAb 10F9 was conserved also after incubation at 37C for 2 h without protease inhibitors (data not really shown). Open in another window FIG. a higher amount of antigenicity, after cleavage even. Antibody recognition by enzyme-linked immunosorbent assay using the truncated recombinant MTP uncovered that anti-MTP antibodies can be found in experimentally contaminated mouse sera. Hence, MTP may be useful as an antigen for the serodiagnosis of principal an infection. Heat shock proteins 70 (HSP70) is among the most extremely conserved proteins in eukaryotic and prokaryotic cells. It’s been reported that parasite-derived HSP70 has an important function in the host-parasite connections (15). An HSP70 of was reported to become highly antigenic also to induce autoantibodies against a bunch HSP70 during an infection. Several research indicated that autoimmunity was linked to the pathogenicity of (2, 3). HSP70 of HSP70-particular antibodies are believed to recognize exclusive amino acidity sequences within a C-terminal area. In general, HSP70 is usually expressed at most of all developmental stages of protozoan parasites and possesses parasite-specific antigenicity. Therefore, HSP70 might be a good candidate as a diagnostic antigen. The diagnosis of trypanosomiasis in mammalian hosts essentially relies on visualization of the parasites in blood. However, parasites are occasionally undetectable because of very low levels of parasitemia. Therefore, detection of antibodies against parasite antigens is required for accurate diagnosis. Most existing antibody detection tests are based on the use of trypanosome extracts as antigens (8), which precludes standardization and specific diagnosis. Recently, a serological method for the detection of with a truncated recombinant HSP70 (Bip homologue) was reported (1). However, since this method showed limited sensitivity for the detection of the organism in cattle with main infections, more sensitive reagents are required for the accurate detection of main infections. African trypanosomes switch their metabolism in response to drastic environmental changes encountered during their life cycle. It is known that this mitochondrion of African trypanosomes in the long slender bloodstream form (BSF) lacks detectable cytochrome activity and that it is missing several important Krebs cycle enzymes. In this developmental stage, the parasite relies almost entirely on PSI-7409 glycolysis for energy production. After uptake by the tsetse travel, the procyclic forms (PCFs) in the insect mid gut possess a fully developed mitochondrion and produce ATP by the Krebs cycle and following oxidative phosphorylation in the mitochondrion. Thus, the proteins related to the Krebs cycle and oxidative phosphorylation are developmentally regulated in terms of their enzymatic activities and expression levels (4, 18). A mitochondrial HSP70 (MTP), whose amino acid sequence is usually distinguishable PSI-7409 from those of cytosol HSP70 and Bip, SMARCA4 is located in the matrix of a mitochondrion and is required for the translocation and refolding of nucleus-encoded mitochondrial matrix proteins. Because the gene of African trypanosomes has not been cloned, the usefulness of recombinant MTP as a diagnostic antigen for African trypanosomiasis has not been clarified. Recently, we reported that monoclonal antibody (MAb) 10F9 recognizes a 76-kDa mitochondrial antigen in (11). In the present study, we cloned the gene of and clarified that a specific antigenic epitope is located in its C-terminal region. Moreover, we revealed that this C-terminal region of MTP is usually recognized by sera from mice with main infection. MATERIALS AND METHODS Cloning and sequencing of gene. MAb 10F9, which recognizes a mitochondrial antigen of 76 kDa, was utilized for immunoscreening (11). A Uni-ZAP cDNA expression library constructed from PCF mRNA was screened with MAb 10F9 by using the gene, PCRs with oligonucleotide primers specific for the consensus sequence of the spliced leader RNA (5-ACGAGGTTTCTGTACTATAT-3) and the partial cDNA sequence of were performed. The nucleic acid sequence was decided with the BigDye Terminator Cycle Sequencing kit (Applied Biosystems, Foster City, Calif.). Trypanosomes. IL-3000 PCFs were produced in TVM-1 medium as explained by Hirumi and Hirumi (10). PCFs were obtained from the culture supernatant by centrifugation at 1,500 for 10 min at 4C and washed three times with phosphate-buffered saline. BSFs were produced in male BALB/c mice (age, 8 to 10 weeks; CLEA Japan Inc., Tokyo, Japan). The mice were infected by intraperitoneal injection of BSFs (107 parasites/ml, 0.1 ml/mouse). When PSI-7409 the mice showed levels of parasitemia greater than 108 parasites/ml, the infected blood was collected by cardiac puncture. The trypanosomes were purified by.