THE COMPARATIVE EFFECTS OF BIOCYTIN AND A YEAST EXTRACT CONCENTRATE ON ASPARTIC ACID DEAMINASE

Abstract
Biocytin, biotin, yeast extract and the coenzyme fraction of Lichstein and Christman were tested for their respective abilities to enhance the activity of aspartic acid deaminase. In this system biocytin was essentially inactive, biotin caused a detectable stimulation, whereas the yeast extract and coenzyme fraction enhanced the deaminase activity considerably. These results, together with studies on growth stimulation of biotin-requiring strains of yeast indicated that biocytin is different from the coenzyme fraction of Lichstein and Christman.

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