Inhibition of Phosphatase Activity of Lake Water and Phytoplankton with Tetrapyrrole Compounds.
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Inhibitory effects of tetrapyrrole compounds upon alkaline or acid phosphatase of lake water, phytoplankton, and authentic enzymes were investigated. Alkaline phosphatase activity from three sources was inhibited with bilirubin, biliverdin, mesopor-phyrin, chlorophyllin and urobilin. However, inhibiting rates of these tetrapyrroles differed among one another. Acid phosphatase activity was also inhibited with all tetrapyrrole compounds except urobilin. According a Lineweaver-burk plot which showed the inhibition of tetrapyrroles on alkaline and acid phosphatase, biliverdin, urobilin, bilirubin and EDTA inhibited alkaline phosphatase uncompetitively, uncompetitively, competitively and noncompetitively, in that order. Tetrapyrrole compounds noncompetitively inhibited acid phosphatase. On the other hand, gel filtration chromatography of the solution containing alkaline phosphatase and urobilin showed that urobilin took up zinc from the enzyme. These results indicate that the inhibition of tetrapyrrole compounds on phosphatases must be caused by chelate function of tetrapyrrole.
- 日本陸水学会の論文
日本陸水学会 | 論文
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