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Intermolecular disulfide bond influences unphosphorylated STAT3 dimerization and function.

Elena Butturini1, Giovanni Gotte1, Daniele Dell'Orco1

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The Biochemical Journal
|August 4, 2016
PubMed
Summary
This summary is machine-generated.

Unphosphorylated STAT3 (U-STAT3) dimerizes via disulfide bonds, crucial for DNA binding and function. These disulfide bridges stabilize the U-STAT3 dimer, impacting gene transcription and cellular processes.

Keywords:
STAT3dimerizationdisulfide bonds

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Area of Science:

  • Molecular Biology
  • Cellular Signaling
  • Biochemistry

Background:

  • Signal transducer and activator of transcription 3 (STAT3) is a key transcription factor.
  • Unphosphorylated STAT3 (U-STAT3) has emerging roles in cytokine response, cancer, and heterochromatin stability.
  • The precise molecular mechanisms governing U-STAT3 function, particularly its dimerization and DNA binding, remain incompletely understood.

Purpose of the Study:

  • To elucidate the molecular mechanism of U-STAT3 dimerization.
  • To identify the structural basis for U-STAT3 dimer stability and DNA-binding activity.
  • To propose a model for U-STAT3 dimerization.

Main Methods:

  • Identification of intermolecular disulfide bridges using biochemical assays.
  • Site-directed mutagenesis to investigate the role of cysteine residues.
  • Spectroscopic analyses to assess dimer stability and DNA-binding capability.
  • In vitro and in vivo redox regulation studies.

Main Results:

  • Two intermolecular disulfide bridges (Cys367-Cys542 and Cys418-Cys426) were identified in U-STAT3 dimers.
  • These disulfide bonds are critical for the structural integrity and stability of the U-STAT3 dimer.
  • The Cys367-Cys542 disulfide bridge is essential for U-STAT3 DNA-binding activity; mutations abolish this capability.
  • Noncovalent interactions support folding and dimer formation, but disulfide bonds are vital for functional dimer preservation.

Conclusions:

  • U-STAT3 dimerization is stabilized by specific intermolecular disulfide bonds.
  • These disulfide bonds are crucial for maintaining the functional dimer and its DNA-binding activity.
  • A reaction scheme involving initial common dimerization followed by disulfide bond stabilization is proposed for U-STAT3.