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Sorting nexin 6 interacts with breast cancer metastasis suppressor-1 and promotes transcriptional repression

José Rivera1, Diego Megías, Jerónimo Bravo

  • 1Centro Nacional de Investigaciones Cardiovasculares Carlos III, E-28029 Madrid, Spain. jrivera@cnic.es

Journal of Cellular Biochemistry
|September 11, 2010
PubMed

Insights

Sorting nexin 6 (SNX6) interacts with breast cancer metastasis suppressor 1 (BRMS1), enhancing its transcriptional repression. This novel SNX6-BRMS1 interaction suggests new roles for SNX6 in nuclear functions and cancer progression.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Sorting nexin 6 (SNX6) is primarily cytoplasmic, involved in membrane receptor trafficking, and a known TGF-β interactor.
  • SNX6 is a component of the Retromer complex, but its nuclear functions remain largely uncharacterized.
  • Pim-1-dependent nuclear translocation suggests a potential nuclear role for SNX6.

Purpose of the Study:

  • To investigate novel cellular functions and interaction partners of Sorting nexin 6 (SNX6).
  • To characterize the interaction between SNX6 and breast cancer metastasis suppressor 1 (BRMS1).
  • To determine the functional consequences of the SNX6-BRMS1 interaction on transcriptional regulation.

Main Methods:

  • Yeast two-hybrid screening to identify SNX6 interacting proteins.
  • In vitro protein interaction assays and Förster Resonance Energy Transfer (FRET) analysis to confirm and characterize the interaction.
  • Coiled-coil domain mapping to identify minimal binding motifs.
  • Gene reporter assays to assess the impact on transcriptional repression and trans-activation.

Main Results:

  • A novel interaction between SNX6 and breast cancer metastasis suppressor 1 (BRMS1) was identified.
  • The interaction was confirmed in vitro and by FRET analysis, with coiled-coil domains identified as the minimal binding regions.
  • SNX6 was found to enhance BRMS1-dependent transcriptional repression.
  • Overexpression of SNX6 diminished trans-activation in a dose-dependent manner.

Conclusions:

  • SNX6 interacts with BRMS1, suggesting a novel role in nuclear processes.
  • SNX6 modulates BRMS1's function in transcriptional regulation, potentially impacting cancer metastasis.
  • This interaction opens new avenues for understanding SNX6's cellular functions beyond intracellular trafficking.

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