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Multiple activities contribute to Pc2 E3 function.

Michael H Kagey1, Tiffany A Melhuish, Shannon E Powers

  • 1Department of Biochemistry and Molecular Genetics, Center for Cell Signaling, University of Virginia, Charlottesville, VA 22908, USA.

The EMBO Journal
|December 14, 2004
PubMed
Summary
This summary is machine-generated.

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Polycomb 2 (Pc2) protein enhances CtBP sumoylation through its adapter function. Two distinct domains within Pc2 are essential for its full in vivo SUMO E3 ligase activity.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Epigenetics

Background:

  • Polycomb 2 (Pc2) is a polycomb protein known to possess SUMO E3 ligase activity.
  • Pc2 targets corepressors CtBP and CtBP2 for sumoylation, a crucial post-translational modification.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying Pc2's SUMO E3 ligase activity.
  • To identify the specific domains within Pc2 responsible for its function in CtBP sumoylation.

Main Methods:

  • In vivo and in vitro assays were employed to study Pc2's interaction with Ubc9 and CtBP.
  • Mutagenesis of the CtBP binding site on Pc2 was performed to assess its impact on E3 activity.
  • Functional analysis of Pc2 fragments and domains was conducted.

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Main Results:

  • Pc2's adapter function in vivo enhances CtBP sumoylation.
  • Mutation of the CtBP binding site on Pc2 abrogated its E3 activity towards CtBP.
  • A carboxyl-terminal fragment of Pc2, while recruiting Ubc9 and CtBP, lacked E3 activity, which was restored by a second identified domain.

Conclusions:

  • Pc2 possesses two distinct domains crucial for its complete in vivo SUMO E3 ligase activity.
  • Adapter function is necessary for the selective corecruitment of the E2 enzyme (Ubc9) and substrate (CtBP) in vivo.
  • SUMO E3 ligases are complex functional units, not merely platforms for E2 and substrate binding.