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Serine phosphorylation of Stat6 negatively controls its DNA-binding function

Nilesh R Maiti1, Pankaj Sharma, Phyllis C Harbor

  • 1Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic Foundation, OH 44195, USA.

Journal of Interferon & Cytokine Research : the Official Journal of the International Society for Interferon and Cytokine Research
|September 27, 2005
PubMed

Insights

Phosphorylation of Stat6 on serine residues in its transactivation domain inhibits DNA binding, negatively controlling interleukin-4 (IL-4)-responsive gene expression. This occurs without affecting Tyr(641) phosphorylation or nuclear translocation.

Area of Science:

  • Molecular Biology
  • Immunology
  • Cell Signaling

Background:

  • Interleukin-4 (IL-4) and IL-13 signaling are crucial for immune responses.
  • Signal transducer and activator of transcription 6 (Stat6) mediates these signals.
  • Stat6 activation involves phosphorylation, dimerization, and nuclear translocation.

Purpose of the Study:

  • To investigate the role of Stat6 serine phosphorylation in IL-4-mediated gene transcription.
  • To determine if serine phosphorylation affects Stat6 DNA-binding activity.

Main Methods:

  • Phosphorylation site mapping of Stat6.
  • Analysis of Stat6 DNA-binding activity in IL-4-stimulated cells.
  • Assessment of Stat6 dimerization and nuclear translocation.

Main Results:

  • Phosphorylation of multiple serine residues in the Stat6 transactivation domain (TAD) ablates DNA-binding activity.
  • Serine phosphorylation does not impact Tyr(641) phosphorylation, dimerization, or nuclear translocation.
  • These findings suggest a negative regulatory mechanism for IL-4-responsive gene expression.

Conclusions:

  • Stat6 serine phosphorylation in the TAD is a critical regulator of IL-4 signaling.
  • This phosphorylation event likely induces conformational changes, impairing DNA binding.
  • This mechanism provides a novel insight into the control of inflammatory and immune responses mediated by IL-4 and IL-13.

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