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- W4243496237 abstract "The upstream activating sequence of the adjacent and divergently transcribed GAL1 and GAL10 genes of Saccharomyces cerevisiae (UASG) contains at least three distinct classes of overlapping transcriptional control sites. The transcription activator GAL4 binds to four related sites in UASG and induces expression of GAL1 and GAL10 when galactose is available. We showed that UASG contains two additional positive control sites, designated GAL4/galactose-independent activating elements (GAEs), which reside at positions adjacent to or overlapping the GAL4-binding sites. When separated from neighboring sequences in UASG, the GAEs activate transcription independently of GAL4 with no requirement for galactose. In the intact GAL1-GAL10 divergent promoter region, their activity is ordinarily repressed by multiple negative control elements, the GAL operators. When galactose is available, GAL4 overcomes the activity of the GAL operators, while the putative GAE-binding proteins stay repressed. Combined, these results imply that distinct activators (GAL4 and GAE proteins) bound at adjacent or overlapping sites in UASG are differentially regulated by putative repressor proteins simultaneously bound at adjacent GAL operators. We surmise that GAE1 and GAE2 may have a physiological function other than regulation of galactose catabolism per se and discuss three hypotheses to account for their presence in UASG." @default.
- W4243496237 created "2022-05-12" @default.
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- W4243496237 date "1989-10-01" @default.
- W4243496237 modified "2023-10-17" @default.
- W4243496237 title "Differential repression of GAL4 and adjacent transcription activators by operators in the yeast GAL upstream activating sequence" @default.
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- W4243496237 doi "https://doi.org/10.1128/mcb.9.10.4282-4290.1989" @default.
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