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The RAD7 gene of Saccharomyces cerevisiae was cloned on a 4.0-kilobase (kb) DNA fragment and shown to provide full complementation of a rad7-delta mutant strain. The nucleotide sequence of a 2.2-kb DNA fragment which contains the complete RAD7 gene was determined. Transcription of the RAD7 gene initiates at multiple sites in a region spanning positions -61 to -8 of the DNA sequence. The 1.8-kb RAD7 mRNA encodes a protein of 565 amino acids with a predicted size of 63.7 kilodaltons. The hydropathy profile of the RAD7 protein indicates a highly hydrophilic amino terminus and a very hydrophobic region toward the carboxyl terminus. A RAD7 subclone deleted for the first 99 codons complements the rad7-delta mutation, but not the rad7-delta rad23-delta double mutation, indicating that the RAD23 protein can compensate for the function that is missing in the amino-terminally deleted RAD7 protein. The RAD7 and RAD23 genes in multicopy plasmids do not complement the rad23-delta and rad7-delta mutations, respectively. These observations could mean that although the two proteins might share a common functional domain, they must also perform distinct functions. Alternatively, an interaction between the RAD7 and RAD23 proteins could also account for these observations.

molecular and cellular biology

RAD7 gene of Saccharomyces cerevisiae: transcripts, nucleotide sequence analysis, and functional relationship between the RAD7 and RAD23 gene products.