Acid Phosphatase in Clonorchis sinensis

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Abstract
Evidence is presented that the level of acid phosphatase is high in the tissue of Clonorchis sinensis. The properties of the enzyme were studied by (1) various chemical substances that inhibit or activate enzyme activity, (2) pH -activity curves, and (3) starch gel electrophoresis. The pH -activity curves revealed three peaks at pH 4.0, 4.5, and 5.5. The enzyme was separated electrophoretically into three fractions, with different Michaelis constants. The results suggest the presence of acid phosphatase isozymes in the parasite. This enzyme was found to be distributed all over the body surface. Alkaline phosphatase was found to be low in the tissue of the parasite.