Synthesis and release of N AD(P)ase by wild type was studied in experiments in which mycelia grown in Vogel minimal medium were transferred to media containing protein as the only carbon source. Several results are presented suggesting that the NAD(P)ase may be induced by the presence of protein in the culture medium. Low concentrations of sucrose or glucose (0.1%), Casamino acids or some amino acids such as methionine, cysteine, phenylalanine and tryptophan strongly repressed the enzyme synthesis. Under induction conditions NAD(P)ase and alkaline protease appeared together in the culture medium. It would appear that NAD(P)ase and alkaline protease are coordinately regulated by a common control mechanism related to carbon catabolism.


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