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. 1990 Jun 11;18(11):3219–3225. doi: 10.1093/nar/18.11.3219

Characterisation of sequences required for RNA initiation from the PGK promoter of Saccharomyces cerevisiae.

J Rathjen 1, J Mellor 1
PMCID: PMC330926  PMID: 2192358

Abstract

In the phosphoglycerate kinase (PGK) gene of yeast, as in other highly expressed yeast genes, the sequences surrounding the site of RNA initiation have a loosely conserved structure of a CT rich stretch followed by the tetranucleotide CAAG. Using internal deletions and insertions we have identified the elements in the PGK promoter which are required for correct RNA initiation at the CAAG sequence at -39. The results indicate that two different components of the PGK promoter contribute to correct RNA initiation, the TATA homologies, located at -152 and -113, and the sequences at the site of initiation. Both TATA elements can function in RNA initiation. Deletion of the upstream TATA element, TATAI, results in slightly heterogeneous RNA initiation, but the majority of the RNA initiates correctly. Deletion of both the PGK TATA elements results in the majority of the RNA initiating at sites downstream from the wild-type I site, within the structural gene between +40 to +80. The CT rich box is not essential for correct mRNA initiation as shown by deletion analysis. The site of RNA initiation in the PGK promoter appears to be determined by sequences located immediately 5' of the CAAG sequence motif. This short sequence, ACAGATC, when located the correct distance from the TATA elements may be sufficient to determine a discrete initiation site.

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