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Analysis of the creA gene, a regulator of carbon catabolite repression in Aspergillus nidulans.

Department of Genetics, University of Adelaide, Australia.

ABSTRACT

The complete nucleotide sequence derived from a genomic clone and two cDNA clones of the creA gene of Aspergillus nidulans is presented. The gene contains no introns. The derived polypeptide of 415 amino acids contains two zinc fingers of the C2H2 class, frequent S(T)PXX motifs, and an alanine-rich region indicative of a DNA-binding repressor protein. The amino acid sequence of the zinc finger region has 84% similarity to the zinc finger region of Mig1, a protein involved in carbon catabolite repression in yeast cells, and it is related both to the mammalian Egr1 and Egr2 proteins and to the Wilms' tumor protein. A deletion removing the creA gene was obtained, by using in vitro techniques, in both a heterokaryon and a diploid strain but was unobtainable in a pure haploid condition. Evidence is presented suggesting that the phenotype of such a deletion, when not complemented by another creA allele, is leaky lethality allowing limited germination of the spore but not colony formation. This phenotype is far more extreme than that of any of the in vivo-generated mutations, and thus either the gene product may have an activator activity as well as a repressor function or some residual repressor function may be required for full viability.

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