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PIAS/SUMO: new partners in transcriptional regulation

D Schmidt1, S Müller

  • 1Department of Molecular Cell Biology, Max Planck Institute of Biochemistry, Am Klopferspitz 18a, 82152, Martinsried, Germany.

Cellular and Molecular Life Sciences : CMLS
|December 20, 2003
PubMed

Insights

Protein inhibitor of activated STATs (PIAS) proteins regulate gene transcription. These PIAS proteins act as E3-like ligases, attaching SUMO modifiers to targets, influencing cellular pathways and transcriptional regulation.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Genetics

Background:

  • Protein inhibitor of activated STATs (PIAS) proteins were first identified as negative regulators of cytokine signaling, inhibiting STAT-transcription factors.
  • Emerging evidence indicates PIAS proteins function as transcriptional coregulators in diverse cellular pathways, including Wnt, p53, and steroid hormone signaling.

Purpose of the Study:

  • To review key findings on the role of PIAS proteins in regulating transcriptional processes.
  • To propose a model for how the PIAS/SUMO system modulates transcriptional activities.

Main Methods:

  • Literature review of PIAS protein functions.
  • Analysis of PIAS protein interactions and SUMOylation activities.
  • Subnuclear localization studies of PIAS/SUMO complexes.

Main Results:

  • PIAS proteins function as E3-like ligases, mediating SUMOylation of target proteins.
  • SUMO ligase activity and transcriptional coregulator activity of PIAS proteins are often functionally correlated.
  • The PIAS/SUMO pathway represents a significant mechanism for transcriptional regulation.

Conclusions:

  • PIAS proteins play a crucial role in transcriptional regulation through their SUMO ligase activity.
  • The PIAS/SUMO system modulates transcription by facilitating the assembly of coactivator or corepressor complexes.
  • PIAS proteins are key regulators within distinct subnuclear structures, impacting various cellular pathways.

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