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Ceap/BLOS2 interacts with BRD7 and selectively inhibits its transcription-suppressing effect on cellular

Jing Sun1, Jing Nie, Bingtao Hao

  • 1State Key Laboratory of Proteomics, Beijing Proteome Research Center, Beijing Institute of Radiation Medicine, Beijing 100850, China.

Cellular Signalling
|March 11, 2008
PubMed

Insights

Centrosome-associated protein Ceap-16 (BLOS2) interacts with tumor suppressor BRD7 (bromodomain containing protein 7). This interaction reveals a new role for Ceap-16 in regulating gene transcription by inhibiting BRD7

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Centrosome-associated protein Ceap-16 (BLOS2) promotes cell proliferation, but its mechanism is unknown.
  • Bromodomain-containing protein 7 (BRD7) is a tumor suppressor that negatively regulates cell growth.

Purpose of the Study:

  • To identify novel Ceap-16 interacting proteins.
  • To elucidate the mechanism by which Ceap-16 influences cell proliferation.

Main Methods:

  • Co-immunoprecipitation assays to confirm in vitro and in vivo interactions between Ceap-16 and BRD7.
  • Analysis of protein domains mediating the Ceap-16/BRD7 interaction.
  • Cellular localization studies to track Ceap-16 translocation.
  • Reporter gene assays to assess the effect of Ceap-16 on BRD7's transcriptional activity.
  • Chromatin immunoprecipitation to investigate complex formation with histones.

Main Results:

  • BRD7 was identified as a novel Ceap-16 interacting protein.
  • Ceap-16 and BRD7 interact via specific regions (BRD7 C-terminus, Ceap-16 central region).
  • Ceap-16 binding facilitates its nuclear translocation, where it inhibits BRD7's suppression of target genes like E2F3 and cyclin A.
  • Ceap-16, BRD7, and histones (H3/H4) form a complex, with Ceap-16 not competing for BRD7 binding sites on histones.

Conclusions:

  • Ceap-16 interacts with the tumor suppressor BRD7, influencing its subcellular localization and transcriptional activity.
  • Ceap-16 plays a novel role in transcriptional regulation by modulating BRD7 function.
  • These findings provide insights into the molecular mechanisms underlying cell proliferation and tumor suppression.

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