Abstract
1) ADP was a potent inhibitor of the ascorbic-2-sulfate sulfohydrolase activity of Charonia lampas liver. The inhibition was competitive with respect to ascorbate 2-sulfate. The Ki value was 5.9 muM. ADP did not inhibit arylsulfatase (EC 3.1.6.1) of the same organism. 2) Other nucleoside 5'-diphosphates and GTP showed similar inhibition of ascorbate-2-sulfate sulfohydrolase activity. 3) The effects of different nucleosides, nucleotides, and sugar phosphates on ascorbate-2-sulfate sulfohydrolase activity were investigated. Phosphate derivatives other than 3',5'-cyclic AMP were more or less inhibitory.
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