BRCA1 cooperates with NUFIP and P-TEFb to activate transcription by RNA polymerase II

Pavel Čabart, Helen K Chew, Shona Murphy

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

The tumor suppressor gene product BRCA1 is a component of the MNA polymerase II (pol II) holoenzyme that is involved, through binding to various regulatory proteins, in either activation or repression of transcription. Using a yeast two-hybrid screen, we have identified a human zinc-finger-containing protein NUFIP that interacts with BRCA1. The ubiquitous, stably expressed, nuclear protein NUFIP specifically stimulates activator-independent pol II transcription in vitro and in vivo. Immunodepletion of the endogenous NUFIP causes a marked decrease of pol II transcription, which is then shown to be restored by stable complex of ectopically produced NUFIP and associated factors. NUFIP not only interacts with BRCA1 but also associates with the positive elongation factor P-TEFb through interaction with the regulatory Cyclin T1 subunit. Cyclin T1 is required for BRCA1- and NUFIP-dependent synergistic activation of pol II transcription in 293 cells. Mutation of the zinc-finger domain abolishes the NUFIP-mediated transcriptional activation. We show that NUFIP is associated with preinitiation complexes, open transcription complexes, and elongation complexes. In addition, NUFIP facilitates ATP-dependent dissociation of hyperphosphorylated pol II from open transcription complexes in vitro.

Original languageEnglish (US)
Pages (from-to)5316-5329
Number of pages14
JournalOncogene
Volume23
Issue number31
DOIs
StatePublished - Jul 8 2004

Keywords

  • BRCA1
  • NUFIP
  • P-TEFb
  • RNA polymerase II
  • Transcriptional activator

ASJC Scopus subject areas

  • Molecular Biology
  • Cancer Research
  • Genetics

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