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Functional interaction of STAT3 transcription factor with the coactivator NcoA/SRC1a

Sandrine Giraud1, Frédéric Bienvenu, Sylvie Avril

  • 1INSERM EMI-U 9928, 4 rue Larrey, CHU Angers, Angers Cedex 49033, France.

The Journal of Biological Chemistry
|January 5, 2002
PubMed

Insights

Steroid receptor coactivator 1 (SRC1a) enhances signal transducer and activator of transcription 3 (STAT3) activity. SRC1a and CBP/p300 may collaborate to regulate STAT3-mediated gene transcription.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Gene Regulation

Background:

  • Signal transducer and activator of transcription 3 (STAT3) proteins are key mediators of cytokine signaling.
  • STAT3 activation involves nuclear translocation and recruitment of coactivators like CBP/p300 for gene transcription.

Purpose of the Study:

  • To investigate the role of steroid receptor coactivator 1 (SRC1a) as a coactivator for STAT3.
  • To elucidate the mechanism by which SRC1a influences STAT3 transcriptional activity.

Main Methods:

  • Coimmunoprecipitation assays to detect protein-protein interactions.
  • Pull-down experiments to map protein interaction domains.
  • Transient transfection and chromatin immunoprecipitation assays to assess transcriptional activity and promoter recruitment.

Main Results:

  • SRC1a physically associates with STAT3 upon interleukin-6 stimulation.
  • The N-terminal region of SRC1a interacts with the STAT3 activation domain.
  • SRC1a enhances STAT3-mediated gene activation, dependent on its CBP-interacting domain.
  • STAT3, SRC1a, and CBP/p300 are co-recruited to the p21(waf1) promoter.

Conclusions:

  • SRC1a functions as a coactivator for STAT3 transcriptional activity.
  • SRC1a and CBP/p300 may act in a common pathway to regulate STAT3.
  • These findings expand the known functions of SRC1a in gene regulation.

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