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Breast cancer metastasis suppressor 1 modulates SIRT1-dependent p53 deacetylation through interacting with DBC1

Xueni Liu1, Elphire Ehmed1, Boyao Li1

  • 1State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University Shanghai 200438, P. R. China.

American Journal of Cancer Research
|July 19, 2016
PubMed

Insights

Breast cancer metastasis suppressor 1 (BRMS1) interacts with deleted in breast cancer 1 (DBC1), a SIRT1 regulator. BRMS1 disrupts the DBC1-SIRT1 complex, impacting p53 acetylation during genotoxic stress.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cellular Biology

Background:

  • Breast cancer metastasis suppressor 1 (BRMS1) regulates chromatin and transcription.
  • The precise molecular functions of BRMS1 are not fully understood.
  • Deleted in breast cancer 1 (DBC1) is a known regulator of SIRT1 activity and genotoxic stress response.

Purpose of the Study:

  • To identify novel interacting partners of BRMS1.
  • To elucidate the role of BRMS1 in regulating DBC1 and SIRT1.
  • To investigate the impact of BRMS1 on p53 acetylation in response to genotoxic stress.

Main Methods:

  • Co-immunoprecipitation assays to confirm BRMS1-DBC1 interaction.
  • Analysis of protein domains critical for BRMS1-DBC1 binding.
  • Assessment of SIRT1 activity and p53 acetylation levels under genotoxic stress in the presence and absence of BRMS1.

Main Results:

  • DBC1 was identified as a novel binding partner of BRMS1.
  • The interaction between BRMS1 and DBC1 requires specific domains on both proteins.
  • BRMS1 interferes with the DBC1-SIRT1 complex formation.
  • BRMS1 influences SIRT1-dependent p53 acetylation during genotoxic stress.

Conclusions:

  • BRMS1 acts as a novel regulator of the DBC1-SIRT1 complex.
  • BRMS1 modulates SIRT1-dependent p53 deacetylation.
  • These findings provide new insights into the molecular mechanisms of metastasis suppression and genotoxic stress response.
Keywords:
BRMS1DBC1SIRT1p53protein interaction

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