Studies on sulphatases. 26. Arylsulphatase activity in the digestive juice and digestive gland of <i>Helix pomatia</i>

Abstract

During the course of studies on arylsulphatases in these Laboratories evidence has accumulated which suggests that these enzymes can be classified into two types. The type I enzymes are particularly active towards simple arylsulphates such as potassium p-nitrophenyl sulphate and potassium p-acetylphenyl sulphate. They are inhibited by cyanide but not by phosphate and fluoride. In contrast the type II enzymes show relatively greater activity towards more complex arylsul- phates such as dipotassium 2-hydroxy-5-nitro- phenyl sulphate, and their behaviour towards cyanide, phosphate and fluoride is the reverse of that shown by the type I enzymes.