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The inhibition of glycolysis by 2,3-dinitrilo-1,4-dithia-9,10-antraquinone (DDA) in Ehrlich ascites carcinoma (EAC) cells as well as in the investigated respiratory and fermentative strains of yeasts was found to be the result of inactivation of thiol enzymes of this pathway. Increasing concentration of DDA caused, in EAC cells, marked inhibition of hexokinase (HK), phosphofructokinase (PFK) and practically total inhibition of glyceraldehyde-3-phosphate dehydrogenase (GAPDH). These three enzymes, as well as alcohol dehydrogenase (ADH) were also inactivated by DDA in yeasts. DDA inhibited the biosynthetic processes as measured by following the rate of [14C]adenine and [14C)]valine incorporation into TCA-precipitable fractions proportionally to the degree of glucose consumption by EAC or the yeast cells.
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