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Expression of the gene cpc-1 is required for cross-pathway-mediated regulation of amino acid-biosynthetic genes in Neurospora crassa. We have cloned cpc-1 and present an analysis of its structure and regulation. The cpc-1-encoded transcript contains three open reading frames, two of which are located in the 720-nucleotide leader segment preceding the cpc-1 coding region. The two leader open reading frames, if translated, would produce peptides 20 and 41 residues in length. The deduced amino acid sequence of the cpc-1 polypeptide, CPC1, contains segments similar to the DNA-binding and transcriptional activation domains of GCN4, the major cross-pathway regulatory protein of yeast. The structural and functional similarities of CPC1 and GCN4 proteins suggest that cpc-1 encodes the analogous transcriptional activator of N. crassa. Messenger RNA measurements indicate that cpc-1 is transcriptionally regulated in response to amino acid starvation. The segment of CPC1 similar to the DNA-binding domain of GCN4 also is similar to the DNA-binding domains of the avian sarcoma virus oncogene-encoded v-JUN protein and human c-JUN protein.

proceedings of the national academy of sciences of the united states of america

The cross-pathway control gene of Neurospora crassa, cpc-1, encodes a protein similar to GCN4 of yeast and the DNA-binding domain of the oncogene v-jun-encoded protein.