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Vacuolar proton pyrophosphatase (V-PPase), an electrogenic proton pump widely distributed in non-mammalian species, is one of the important targets for acidocalcisomes. In this study, a novel method of peptide-based antibody generation was performed to produce monoclonal antibodies (MAbs) against Toxoplasma gondii V-PPase. Three hybridomas were identified and confirmed by ELISA, Western blotting, and immunofluorescence. All of them can react with an 85 kDa band of T. gondii protein in purified acidocalcisomal fraction. The three MAbs were all specific to the synthetic peptide of YTKAADVGADLSGKNEYGMSEDDPRNPAC, corresponding to amino acids at the location of 292aa-320aa of TgVP1 amino acid sequence. These specific MAbs will be valuable tools for further study of T. gondii infection biology, pathogenesis, and host immune response.

Generation and Identification of Peptide-Based Monoclonal Antibodies Against Vacuolar Proton Pyrophosphatase of Toxoplasma gondii