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Related Experiment Videos

ERp57 is present in STAT3-DNA complexes.

Margherita Eufemi1, Sabina Coppari, Fabio Altieri

  • 1Department of Biochemical Sciences A. Rossi Fanelli, CNR Institute of Molecular Biology and Pathology, University La Sapienza, 00185 Rome, Italy.

Biochemical and Biophysical Research Communications
|September 29, 2004
PubMed
Summary

Signal transducer and activator of transcription 3 (STAT3) binds the alpha2-macroglobulin gene enhancer with protein disulfide isomerase ERp57 in melanoma cells. ERp57 is essential for STAT3

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Area of Science:

  • Molecular biology
  • Cancer research
  • Cellular signaling

Background:

  • Signal transducer and activator of transcription 3 (STAT3) is constitutively activated in M14 melanoma cells, consistent with findings in other melanoma cell types.
  • STAT3 activation is implicated in various cancers, including melanoma, highlighting the need to understand its regulatory mechanisms.

Purpose of the Study:

  • To investigate the molecular interactions of STAT3 in M14 melanoma cells.
  • To identify co-factors that associate with STAT3 at specific gene regulatory elements.
  • To elucidate the role of protein disulfide isomerase ERp57 in STAT3 DNA binding.

Main Methods:

  • Electrophoretic mobility shift assay (EMSA) to assess DNA-protein interactions.
  • DNA affinity experiments to identify binding partners of STAT3.

Related Experiment Videos

  • Chromatin immunoprecipitation (ChIP) to confirm in vivo binding of STAT3 to target DNA sequences.
  • Use of antibodies to probe protein interactions and functional roles.

    • Main Results:

    • STAT3 was found to bind the alpha2-macroglobulin gene enhancer in M14 melanoma cells.
    • STAT3 forms a complex with protein disulfide isomerase ERp57 at the alpha2-macroglobulin gene enhancer.
    • This STAT3-ERp57 complex also binds the SIE sequence in HepG2 cells stimulated by IL-6.
    • An anti-ERp57 antibody inhibited STAT3 binding to DNA, confirming ERp57's essential role in the complex.

    Conclusions:

    • ERp57 is a necessary component of the DNA-bound STAT3 complex.
    • The functional association between STAT3 and ERp57 may contribute to the oncogenic properties of STAT3.
    • Overexpression of ERp57 in transformed cells could be relevant to STAT3-driven oncogenesis.