Abstract
Apyrase encoding metal-ions activated plasma membrane protease is present in animal and plant tissues. This enzyme can hydrolyze ADP and ATP pyrophosphate bond, resulting in AMP and free phosphate groups, and plays an important role for insects and parasites to evade host immune system. However localization and function of apyrase in the canine hookworm, Ancylostoma caninum, remains unknown. To analyze apyrase gene in A. caninum (a eukaryotic parasitic hookworm), a pair of primers was designed according to the previous EST data. The full-length cDNA of apyrase gene was amplified from A. caninum by RT-PCR. The partial cDNA of apyrase encodes 249 amino acid protein was expressed in Escherechia coli. The recombinant protein was induced to express under proper conditions and the molecular size was as expected. The recombinant protein was purified. The transcripts of apyrase in different stages of A. caninum were analyzed by the Real-time PCR assay, and Immuno-localization assays were used to research the protein expression in different stages of A. caninum
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