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Mol Cell Biol. 1984 August; 4(8): 1454-1459

Differential regulation of the 70K heat shock gene and related genes in Saccharomyces cerevisiae.

ABSTRACT

Saccharomyces cerevisiae contains a family of genes related to Hsp70, the major heat shock gene of Drosophila melanogaster. The transcription of three of these genes, which show no conservation of sequences 5' to the protein-coding region, was analyzed. The 5' flanking regions from the three genes were fused to the Escherichia coli beta-galactosidase structural gene and introduced into yeasts on multicopy plasmids, putting the beta-galactosidase production under yeast promoter control. Analysis of beta-galactosidase mRNA and protein production in these transformed strains revealed that transcription from the three promoters is differentially regulated. The number of transcripts from one promoter is vastly increased for a brief period after heat shock, whereas mRNA from another declines. Transcripts from a third gene are slightly enhanced upon heat shock; however, multiple 5' ends of the mRNA are found, and a minor species increases in amount after heat shock. Transcription of these promoters in their native state on the chromosome appears to be modulated in the same manner.

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