Abstract
The distribution of cysteine desulfhydrase activity in microorganisms was studied with intact cells. The enzyme activity was found mainly in strains belonging to Enterobacteriaceae, especially to genus Aerobacter (Enterobacter). Aerobacter cloacae IFO 12009 showed markedly high activity. l-Cysteine was essential as an inducer of the enzyme formation, of which 0.2% in the medium is appropriate. Intact cells of bacteria containing high cysteine desulfhydrase activity, prepared from broth cultured for 19hr, catalyzed the synthesis of l-cysteine from pyruvate, ammonia and hydrogen sulfide.
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