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. 1988 Apr 11;16(7):2841–2857. doi: 10.1093/nar/16.7.2841

A yeast tRNA(Arg) gene can act as promoter for a 5' flank deficient, non-transcribable tRNA(SUP)6 gene to produce biologically active suppressor tRNA.

K B Stråby 1
PMCID: PMC336436  PMID: 3285324

Abstract

In S. cerevisiae most tRNA genes are located and expressed as single entities. The tDNA(Arg)-tDNA(Asp) pair, however, is transcribed into a dimeric precursor before being processed into two mature tRNA species. The second gene of this pair, tDNA(Asp), is totally dependent on the first gene, tDNA(Arg), and its promoter components, for homologous in vitro transcription. The second gene in the pair is now replaced by the ochre suppressor tDNA(SUP)6-o, which, by itself, cannot be transcribed because of a nonfunctional 5' flanking region. The tDNA(Arg)-tDNA(SUP)6-o was transcribed into a dimeric precursor which was processed to mature tRNA molecules as judged in vitro by electrophoretic separation, and in vivo by their ability to suppress ochre but not amber yeast mutations. Mutations in the internal promoter of the first gene decreased transcription, both in vitro and in vivo, of the second-tRNA(SUP)6-o-gene. Thus tDNA(Arg) with its 5' flanking region can act as an external promoter for other RNA polymerase III-read genes that are by themselves inactive due to impaired promoter/modulator regions.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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