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Acetylation and sumoylation control STAT5 activation antagonistically

Oliver H Krämer1, Richard Moriggl

  • 1Center for Molecular Biomedicine; Institute for Biochemistry and Biophysics; Department of Biochemistry; Friedrich Schiller University of Jena; Jena, Germany.

JAK-STAT
|September 24, 2013
PubMed

Insights

STAT5 protein sumoylation impairs tyrosine phosphorylation, disrupting lymphocyte signaling. Acetylation and sumoylation antagonistically regulate STAT5 activity, impacting immune cell function.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Signaling

Background:

  • Signal transducer and activator of transcription 5 (STAT5) proteins are crucial for lymphocyte development and function.
  • STAT5 activation typically involves tyrosine phosphorylation, but other post-translational modifications are increasingly recognized.
  • These modifications include serine/threonine phosphorylation, acetylation, and sumoylation near the critical tyrosine residue.

Purpose of the Study:

  • To investigate the role of sumoylation in STAT5 signaling.
  • To examine the impact of impaired SUMO-specific protease 1 (SENP1) on STAT5 modification and function.
  • To explore the antagonistic relationship between STAT5 acetylation and sumoylation in controlling tyrosine phosphorylation.

Main Methods:

  • Analysis of STAT5 signaling in lymphocytes from SENP1 knockout (SENP1(-/-)) mice.
  • Assessment of STAT5 sumoylation and tyrosine phosphorylation levels.
  • Investigation of acetylation and sumoylation interplay on STAT5.

Main Results:

  • STAT5 is extensively sumoylated in lymphocytes from SENP1(-/-) mice.
  • Sumoylated STAT5 exhibits abolished tyrosine phosphorylation, indicating impaired signaling.
  • Acetylation and sumoylation of STAT5 were found to act antagonistically.

Conclusions:

  • SUMO-specific protease 1 (SENP1) is essential for normal STAT5 signaling in lymphocytes.
  • Sumoylation of STAT5 inhibits its tyrosine phosphorylation, thereby blocking STAT5-dependent signaling pathways.
  • The balance between STAT5 acetylation and sumoylation is critical for regulating STAT5 activation and function.
Keywords:
STAT5ASTAT5Bacetylationcrosstalksumoylationtyrosine phosphorylation

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