The yeast Rat1 exonuclease promotes transcription termination by RNA polymerase II

Minkyu Kim, Nevan J. Krogan, Lidia Vasiljeva, Oliver J. Rando, Eduard Nedea, Jack F. Greenblatt, Stephen Buratowski

Research output: Contribution to journalArticlepeer-review

397 Scopus citations


The carboxy-terminal domain (CTD) of the RNA polymerase II (RNApII) largest subunit consists of multiple heptapeptide repeats with the consensus sequence YSPTSPS. Different CTD phosphorylation patterns act as recognition sites for the binding of various messenger RNA processing factors, thereby coupling transcription and mRNA processing. Polyadenylation factors are co-transcriptionally recruited by phosphorylation of CTD serine 2 (ref. 2) and these factors are also required for transcription termination. RNApII transcribes past the poly(A) site, the RNA is cleaved by the polyadenylation machinery, and the RNA downstream of the cleavage site is degraded. Here we show that Rtt103 and the Rat1/Rai1 5′ → 3′ exonuclease are localized at 3′ ends of protein coding genes. In rat1-1 or rai1 Δ cells, RNA 3′ to polyadenylation sites is greatly stabilized and termination defects are seen at many genes. These findings support a model in which poly(A) site cleavage and subsequent degradation of the 3′-downstream RNA by Rat1 trigger transcription termination.

Original languageEnglish (US)
Pages (from-to)517-522
Number of pages6
Issue number7016
StatePublished - Nov 25 2004
Externally publishedYes

ASJC Scopus subject areas

  • General


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