Integrator Recruits Protein Phosphatase 2A to Prevent Pause Release and Facilitate Transcription Termination

Kai Lieh Huang, David Jee, Chad B. Stein, Nathan D. Elrod, Telmo Henriques, Lauren G. Mascibroda, David Baillat, William K. Russell, Karen Adelman, Eric J. Wagner

Research output: Contribution to journalArticlepeer-review

Abstract

Efficient release of promoter-proximally paused RNA Pol II into productive elongation is essential for gene expression. Recently, we reported that the Integrator complex can bind paused RNA Pol II and drive premature transcription termination, potently attenuating the activity of target genes. Premature termination requires RNA cleavage by the endonuclease subunit of Integrator, but the roles of other Integrator subunits in gene regulation have yet to be elucidated. Here we report that Integrator subunit 8 (IntS8) is critical for transcription repression and required for association with protein phosphatase 2A (PP2A). We find that Integrator-bound PP2A dephosphorylates the RNA Pol II C-terminal domain and Spt5, preventing the transition to productive elongation. Thus, blocking PP2A association with Integrator stimulates pause release and gene activity. These results reveal a second catalytic function associated with Integrator-mediated transcription termination and indicate that control of productive elongation involves active competition between transcriptional kinases and phosphatases.

Original languageEnglish (US)
Pages (from-to)345-358.e9
JournalMolecular cell
Volume80
Issue number2
DOIs
StatePublished - Oct 15 2020

Keywords

  • Integrator
  • paused RNA Pol II
  • phosphatase
  • transcription regulation
  • transcription termination

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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