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. 1986 Oct;5(10):2703–2710. doi: 10.1002/j.1460-2075.1986.tb04554.x

3'-End formation of transcripts from the yeast rRNA operon.

A E Kempers-Veenstra, J Oliemans, H Offenberg, A F Dekker, P W Piper, R J Planta, J Klootwijk
PMCID: PMC1167172  PMID: 3780675

Abstract

Deletion analysis of artificial rRNA minigenes transformed into Saccharomyces cerevisiae revealed that a 110 bp long fragment corresponding to positions -36 to +74 relative to the 3'-end of the 26S rRNA gene, is both necessary and sufficient for obtaining transcripts whose 3'-termini are identical to those of 26S and 37S (pre-)rRNA. These termini are produced via processing of longer transcripts because in an rna 82.1 mutant the majority of the minigene transcripts extend further downstream. Since the rna 82.1 mutation inactivates an endonuclease involved in the 3'-processing of 5S pre-rRNA it is concluded that the maturation of 37S- and that of 5S pre-rRNA requires a common factor. Comparison of the spacer sequences between Saccharomyces carlsbergensis, Saccharomyces rosei and Hansenula wingei revealed several conserved sequence blocks within the region between +10 and +55. These conserved sequence tracts, which are part of a longer region showing dyad symmetry, are supposed to be involved in the interaction with the processing component(s). Deletion of the sequences required for the formation of the 3'-ends of 26S rRNA and 37S pre-rRNA revealed a putative terminator for transcription by RNA polymerase I situated at position +210. This site maps within a DNA fragment that also contains the enhancing element for rDNA transcription by RNA polymerase I.

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Selected References

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