Summary
SJL mice, which are high responders to Staphylococcal nuclease (nuclease), were immunized and used to produce hybridoma cell lines secreting anti-nuclease monoclonal antibodies (mAb). Ten stable clones were derived from a single fusion. Seven of these produced antibodies of the IgG1,κ isotype and were more precisely characterized for antigenic specificity. Only one hybridoma cell line (54-10-4) produced anti-nuclease antibodies capable of inhibiting enzymatic activity of nuclease. Binding inhibition analyses strongly suggest that the other monoclonal antibodies, which failed to inhibit nuclease activity detect two different antigenic regions, or epitopes, of the molecule: epitope cluster 1 domain is defined by hybridomas 54-2-7, 54-5-2, 54-9-8, and 54-10-8; epitope cluster 2 by 54-5-1 and 54-1-9. Because of its capacity to inhibit nuclease enzymatic activity mAb 54-10-4 was considered specific for a third epitope of the nuclease molecule called epitope 3. Binding studies of these monoclonal antibodies were extended to peptide fragments of the nuclease molecule in order to examine possible cross-reactions with such fragments, as has previously been reported for antibodies purified from polyclonal antisera. Monoclonal antibodies specific for epitope cluster 1 on the native molecule also bound to the fragments 1–126 and 49–149 but failed to bind to fragment 99–149, suggesting that the corresponding epitope(s) is determined by amino acids localized between residues 49 and 99. The epitope clusters 2 and 3 appeared to be expressed only on the native molecule. Monoclonal antibodies of different clusters exhibited very different migration patterns on isoelectric focusing while monoclonal antibodies of the same cluster were indistinguishable, which suggests that they may have originated from the same B cell precursor. Taken together these data suggest that this panel of monoclonal antibodies detects at least three distinct epitopes of the nuclease molecule, one of which could be involved in the determination of the enzymatic site.
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Devaux, C.A., Nadler, P.I., Miller, G.G. et al. Genetic control of immune response to staphylococcal nuclease. XII: Analysis of nuclease antigenic determinants using anti-nuclease monoclonal antibodies. Mol Cell Biochem 68, 31–40 (1985). https://doi.org/10.1007/BF00219386
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DOI: https://doi.org/10.1007/BF00219386