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• W4231926975 abstract "Deletion mutations ending in the 5'-flanking sequences of the Saccharomyces cerevisiae SUP4-o gene have been analyzed for their effects on gene expression. This ochre-suppressing tRNATyr gene was cloned into a S. cerevisiae centromeric plasmid, and its level of in vivo expression was monitored by observing the suppressor phenotype of the gene after transformation into S. cerevisiae. A deletion mutant that retains only four base pairs of the 5'-flanking sequence is profoundly deficient in expression; deletion mutants extending to positions -18, -17, -16, or -15 are moderately deficient; deletion mutants extending to positions -36 or -27 are slightly defective; and mutants retaining more than 60 base pairs of the original 5'-flanking DNA are expressed normally. In some cases, the cloning procedure led to the introduction of multiple BamHI linkers at the SUP4-o-vector fusion site, and in one instance, the resulting structure dramatically affects gene function: the presence of three linkers abutting a -18 deletion completely inhibits the in vivo expression of SUP4-o. In contrast, three linkers that abut a -77 deletion have no effect on in vivo expression. The template properties of these plasmids in a homologous in vitro transcription system parallel the levels of in vivo expression, suggesting that the mutations predominantly affect transcription. The data demonstrate that there are significant functional constraints on the 5'-flanking sequences of this RNA polymerase III-transcribed gene. The dramatic effects of the multiple linker insertion at position -18 suggest that there may be extensive melting of the DNA in this region during normal transcription initiation." @default.
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• W4231926975 date "1984-04-01" @default.
• W4231926975 modified "2023-09-26" @default.
• W4231926975 title "Effects of Altered 5′-Flanking Sequences on the In Vivo Expression of a <i>Saccharomyces cerevisiae</i> tRNA^Tyr Gene" @default.
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• W4231926975 doi "https://doi.org/10.1128/mcb.4.4.657-665.1984" @default.
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