RNA polymerase II termination involves C-terminal-domain tyrosine dephosphorylation by CPF subunit Glc7

Nat Struct Mol Biol. 2014 Feb;21(2):175-179. doi: 10.1038/nsmb.2753. Epub 2014 Jan 12.

Abstract

At the 3' ends of protein-coding genes, RNA polymerase (Pol) II is dephosphorylated at tyrosine residues (Tyr1) of its C-terminal domain (CTD). In addition, the associated cleavage-and-polyadenylation factor (CPF) cleaves the transcript and adds a poly(a) tail. Whether these events are coordinated and how they lead to transcription termination remains poorly understood. Here we show that CPF from Saccharomyces cerevisiae is a Pol II-CTD phosphatase and that the CPF subunit Glc7 dephosphorylates Tyr1 in vitro. In vivo, the activity of Glc7 is required for normal Tyr1 dephosphorylation at the polyadenylation site, for recruitment of termination factors Pcf11 and Rtt103 and for normal Pol II termination. These results show that transcription termination involves Tyr1 dephosphorylation of the CTD and indicate that pre-mRNA processing by CPF and transcription termination are coupled via Glc7-dependent Pol II-Tyr1 dephosphorylation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Phosphoprotein Phosphatases / genetics
  • Phosphoprotein Phosphatases / metabolism
  • Phosphoprotein Phosphatases / physiology
  • Phosphorylation
  • Protein Phosphatase 1 / genetics
  • Protein Phosphatase 1 / metabolism
  • Protein Phosphatase 1 / physiology*
  • Protein Subunits / genetics
  • Protein Subunits / metabolism
  • Protein Subunits / physiology
  • RNA Polymerase II / physiology*
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae / metabolism
  • Saccharomyces cerevisiae Proteins / genetics
  • Saccharomyces cerevisiae Proteins / metabolism
  • Saccharomyces cerevisiae Proteins / physiology*
  • Transcription Termination, Genetic*
  • Tyrosine / metabolism*
  • mRNA Cleavage and Polyadenylation Factors / genetics
  • mRNA Cleavage and Polyadenylation Factors / metabolism
  • mRNA Cleavage and Polyadenylation Factors / physiology*

Substances

  • Protein Subunits
  • SSU72 protein, S cerevisiae
  • Saccharomyces cerevisiae Proteins
  • mRNA Cleavage and Polyadenylation Factors
  • Tyrosine
  • RNA Polymerase II
  • GLC7 protein, S cerevisiae
  • Phosphoprotein Phosphatases
  • Protein Phosphatase 1