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In Aspergillus nidulans the acetamidase enzyme is inducible by omega-amino acids, sources of acetyl-coenzyme A, and benzoate. The amdR (or intA) gene is a positive-control gene involved in omega-amino acid induction only. A cis-acting mutation amdI93 located in a complex controlling region adjacent to the acetamidase structural gene was found to abolish induction by omega-amino acids but not induction by other sources of induction. As predicted, this mutation was epistatic to constitutive amdR alleles but did not affect the expression of mutations in other regulatory genes.

A mutation, adjacent to gene amdS, defining the site of action of positive-control gene amdR in Aspergillus nidulans