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. 1990 Jul 11;18(13):3923–3931. doi: 10.1093/nar/18.13.3923

The upstream activating sequence for L-leucine gene regulation in Saccharomyces cerevisiae.

H Tu 1, M J Casadaban 1
PMCID: PMC331095  PMID: 2197599

Abstract

The upstream activating sequence (UAS) conferring leucine-specific regulation of transcription in Saccharomyces cerevisiae was identified by analysis of the LEU2 promoter and by comparison to other genes regulated by leucine. The UAS was localized with deletions and cloned synthetic DNA. Point mutations and sequence rearrangements were used to identify important basepairs and to construct an improved UAS with increased regulation and expression. The improved UAS contains a core ten basepair, GC-rich, palindromic sequence, which is sufficient to confer minimal levels of activation and regulation, within a 36 basepair palindromic sequence which confers maximal activation and regulation. Deletions downstream of the UAS indicated that the UAS must act in conjunction with at least one other site, perhaps a TATAA region, in order to confer high levels of activation. Tandem copies of the UAS in front of LEU2 increased expression and regulation. Tandem UAS elements in trans on a multi-copy 2 mu-based plasmid decreased expression and regulation. These results are consistent with a model that the UAS serves as the DNA-binding site for diffusible activation factor(s), possibly the LEU3 gene product.

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Selected References

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