Abstract
Effect of metals on the activity of glycylglycine (GG) dipeptidase in pyloric caeca of bonito and yellow-tail was investigated. The results were shown as follows: 1. The GG dipeptidase was greatly activated by Co++ and Mn++, as those from other sources, and also activated by Mg++ as the GG dipeptidase of tunny, while such an activation by Mg++ is not known for the enzyme from other sources. 2. When Co++, Mn++ and Mg++ were 10-3 M in concei tration, the activity of GG dipeptidase was found to be at a maximum. 3. The GG dipeptidase was inhibited by Zn++, Pb++, Cd++ and Ag+, but not by Sr++. 4. The effect of Mg and Mn salts on the activity of GG dipeptidase was not affected by their negative radicals (SO4or Cl').
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