title: RAD7 gene of Saccharomyces cerevisiae: transcripts, nucleotide sequence analysis, and functional relationship between the RAD7 and RAD23 gene products.
abstract: 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.
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D004262:DNA Restriction Enzymes; D004271:DNA, Fungal / Q000235:genetics*; D004307:Dose-Response Relationship, Radiation; D004926:Escherichia coli / Q000235:genetics; D005656:Fungal Proteins / Q000235:genetics*; D005800:Genes, Fungal; D012333:RNA, Messenger / Q000235:genetics; D012441:Saccharomyces cerevisiae / Q000235:genetics* / Q000528:radiation effects; D014158:Transcription, Genetic; D014466:Ultraviolet Rays
chemical_list: D004271:DNA, Fungal; D005656:Fungal Proteins; D012333:RNA, Messenger; D004262:DNA Restriction Enzymes