Effenct of Salts on Enzymatical Production of Dimethyl Sulfide form Gyrodinium cohnii

Abstract

It was found that the evolution of DMS from G. cohnii, a heterotrophic alga of marine origin, resulted from an enzymatical cleavage of DMPT in the cells. This reaction was activated by various inorganic salts at high concentration in an order of increasing effectiveness for anions: Cl-⟩Br-⟩NO₈-»I-⟩SO₄=. The maximum rate of the reaction was obtained at pH 6.2. The enzyme catalyzing this reaction was most stable at pH 5.1. Activity of the enzyme was inhibited by pCMB, IAA and KCN. The inhibition by these compounds was released in part by the addition of Hcys.