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. 1990 Nov;10(11):5921–5926. doi: 10.1128/mcb.10.11.5921

A hypoxic consensus operator and a constitutive activation region regulate the ANB1 gene of Saccharomyces cerevisiae.

C V Lowry 1, M E Cerdán 1, R S Zitomer 1
PMCID: PMC361388  PMID: 2233724

Abstract

We have identified a consensus operator sequence, YYYATTGTTCTC, which mediates the repression imposed by the ROX1 factor upon the members of the hypoxic gene regulon, which includes ANB1, HEM13, COX5b, and CYC7. The members of the regulon were repressed with widely varying stringency, and the variation was correlated with the number and fidelity of operator sequences observed. ANB1 had two operators operating with unequal efficiency, each containing two copies of the operator sequence. Synthetic operator sequences introduced into an operator deletion were effective as monomers but much more so as dimers, consistent with cooperativity. The native operators both imposed ROX1 repression on the GAL1 gene, in either orientation, but the synthetic operators did not, indicating that the sequence context may be important. The repression and activation of ANB1 are independent spatially and functionally, since deletion of the operators did not reduce expression and since both the operator and activation regions functioned separately in the GAL1 UAS. The ANB1 UAS was constitutive, containing several elements distributed over a 300-bp region. There were two dT-rich segments, one of 51 bp and one of 165 bp, the latter capable of activating transcription by itself. Flanking segments containing GRF2 (REB1) and ABF1 (GF1) sites may contribute to activation but were not essential. The UAS showed a strongly preferred orientation.

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Selected References

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