Abstract
Eucaryotes have the ubiquitous enzyme apyrase or ATP diphosphohydrolase, known to catalyze the hydrolysis of the α and β phosphate groups of di- and triphosphonucleosides. In hematophagous arthropods, the salivary glands are the main source of this enzyme that helps the insects to locate blood in hosts by preventing platelet aggregation. A structural comparison between mosquito salivary gland and pig pancreas apyrase was performed using immunoblot analysis with specific polyclonal antibodies raised to the pancreatic enzyme. Strong reactivity was observed with a polypeptide of mol. wt close to 60 kDa in the Aedes aegypti salivary glands, providing evidence for structural homology between the apyrase present in vertebrates and invertebrates.
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