Abstract
In the A. nidulans ethanol utilization pathway, specific induction is mediated by the transactivator AlcR which is subject to strong positive autogenous regulation and activates the transcription of the two structural genes alcA and aldA. Carbon catabolite repression is mediated by CreA which represses directly the transacting gene alcR and the two structural genes. We show here that the basal expression of the alcR and alcA genes is also controlled by the two regulatory circuits, positively by the transactivator AlcR and negatively by the repressor CreA, the aldA gene being subject only to the control of the CreA repressor.
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