NcSUB1 (formerly known as NC-p65) is the first molecularly described proteolytic enzyme of the intracellular protozoan parasite Neospora caninum. This report describes the characterization of a rabbit anti-N54, which is an antiserum generated against an internal fragment of NcSUB1 (amino acids 649–783). In immunofluorescence studies rabbit anti-N54 labeled the apical end of the fixed parasite. By immuno-gold electron microscopy, the antibody bound primarily to the microneme organelles of the parasite. Analysis of secreted parasitic proteins indicated that a protein of molecular weight 65 kDa (reduced) or 55 kDa (nonreduced) was recognized by the antibody. The same secreted proteins were affinity purified with rabbit anti-N54–coupled resins and were shown to contain major proteolytic activity by zymography. Thus, rabbit anti-N54 is the first antibody developed for N. caninum that binds to the microneme proteins and recognizes a major secreted enzyme.
CHARACTERIZATION OF NEOSPORA CANINUM PROTEASE, NcSUB1 (NC-p65), WITH RABBIT ANTI-N54
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Kitland Louie, Robert Nordhausen, Thomas W. Robinson, Bradd C. Barr, Patricia A. Conrad; CHARACTERIZATION OF NEOSPORA CANINUM PROTEASE, NcSUB1 (NC-p65), WITH RABBIT ANTI-N54. J Parasitol 1 December 2002; 88 (6): 1113–1119. doi: https://doi.org/10.1645/0022-3395(2002)088[1113:CONCPN]2.0.CO;2
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