A transcriptional activator is located in the coding region of the yeastPGKgene
- 1 January 1987
- journal article
- Published by Oxford University Press (OUP) in Nucleic Acids Research
- Vol. 15 (15), 6243-6259
- https://doi.org/10.1093/nar/15.15.6243
Abstract
Expression of heterologous genes from the PGK promoter on high copy number plasmids in yeast is relatively poor compared to the intact PGK gene because of low steady-state RNA levels. In this paper we show that low levels of heterologous RNA are not due to instability of mRNA but result from inefficient transcription due to a defect in RNA synthesis. A comparison of RNA levels from homologous and heterologous transcription units allowed the identification of a positive activator for transcription within the PGK coding region which is required for efficient expression of the PGK gene. Deletion of this region, the "downstream activator sequence", causes a six to ten fold reduction in transcriptional efficiency from the PGK 5' noncoding region.Keywords
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