Deletion mapping of sequences essential for in vivo transcription of the iso-1-cytochrome c gene - PubMed (original) (raw)
Deletion mapping of sequences essential for in vivo transcription of the iso-1-cytochrome c gene
G Faye et al. Proc Natl Acad Sci U S A. 1981 Apr.
Abstract
The 5' termini of yeast CYC1 RNA molecules have been mapped, by nuclease S1 digestion of mRNA . DNA duplexes, to seven locations from 29 to 93 base pairs upstream from the initiating ATG codon. When the CYC1 gene is introduced into yeast in plasmid YEp13, substantially the same transcripts are made. Using this system to study in vivo gene expression, we measured the capacity of enzymatically produced DNA deletions to form the normal set of RNAs. Four regions of 5'-flanking DNA were identified as functional. Sequences within the region -242 to -139 are required for maximal CYC1 transcript formation; their deletion reduces transcription by a factor of 15 but does not change the pattern of 5' ends observed. Deletion of the sequence between -242 and -99 does not further change the overall transcript level but does affect the specificity of CYC1 mRNA starting. A deletion that extends from -242 to -75 causes both an additional shift in the pattern of 5' ends observed and a further large decrease (factor of 10--20) in CYC1 RNA level. Deletions that extend from -242 to -43, and particularly two deletions that extend still closer to the initiating ATG, cause the appearance of an abundant transcript which starts upstream of position -1078 and of minor transcripts starting in the region -325 to -245.
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