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Mol Cell Biol. 1992 April; 12(4): 1621-1629

Nucleosome loss activates CUP1 and HIS3 promoters to fully induced levels in the yeast Saccharomyces cerevisiae.

Molecular Biology Institute, University of California, Los Angeles 90024.

ABSTRACT

We have previously shown that nucleosome loss, obtained by repressing histone H4 mRNA synthesis, activates otherwise inactive PHO5, GAL1, and CYC1 gene promoters (fused to the bacterial beta-galactosidase [lacZ] reporter gene) to moderate levels of activity (approximately 2 to 15% of fully induced levels). We now report that nucleosome loss activates the expression of two additional promoters that are normally induced by independent mechanisms: CUP1 (induced by heavy-metal toxicity) and HIS3 (induced by amino acid starvation). Surprisingly, the level of CUP1-lacZ and HIS3-lacZ activation by nucleosome loss approximates fully induced levels of transcription. These CUP1 and HIS3 promoter activities are increased similarly from either episomal or genomic constructs. Our results emphasize the universality of the mechanism by which nucleosome loss activates yeast promoters. Moreover, a comparison of absolute levels of activation for different promoters suggests that activation by nucleosome loss results in a relatively constant level of activation, while levels obtained by normal induction vary considerably. These data argue that nucleosome loss may play a uniquely dominant role in the regulation of certain promoters.

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