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The Mechanism of p53 Rescue by SUSP4

Do-Hyoung Kim1, Chewook Lee1, Si-Hyung Lee1

  • 1Genome Editing Research Center, Korea Research Institute of Bioscience and Biotechnology, 125, Gwahak-ro, Yuseong-gu, Daejeon, 34141, Korea.

Angewandte Chemie (International Ed. in English)
|December 22, 2016
PubMed

Insights

SUMO-specific protease 4 (SUSP4) contains a "p53 rescue motif" that disrupts mdm2 binding, stabilizing the tumor suppressor p53. This motif peptide shows anti-tumor activity, highlighting its therapeutic potential.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • p53 is a crucial tumor suppressor protein.
  • Deactivation of p53 by MDM2 leads to cancer.
  • SUMO-specific protease 4 (SUSP4) rescues p53 from MDM2, but the mechanism is unclear.

Purpose of the Study:

  • To elucidate the mechanism by which SUSP4 rescues p53 from MDM2-mediated deactivation.
  • To identify and characterize the structural features of SUSP4 involved in p53 stabilization.
  • To evaluate the anti-tumor potential of the identified p53 rescue motif.

Main Methods:

  • Nuclear Magnetic Resonance (NMR) spectroscopy to discover and analyze the p53 rescue motif.
  • Structural analysis of the motif's interaction with MDM2.
  • In vitro studies using cancer cell lines expressing wild-type p53.

Main Results:

  • Discovery of a 29-residue "p53 rescue motif" within SUSP4.
  • The motif features two transient helices and a hydrophobic linker, disrupting p53-MDM2 binding.
  • The C-terminal helix binds the p53-binding pocket of MDM2, while the N-terminal helix enhances affinity.
  • A previously unidentified hydrophobic crevice in MDM2 interacts with the motif's linker.
  • A peptide derived from the p53 rescue motif demonstrated anti-tumor activity in relevant cancer cell lines.

Conclusions:

  • SUSP4 utilizes a dual-module strategy, combining the p53 rescue motif and its catalytic domain, to stabilize p53.
  • The pre-structured p53 rescue motif is critical for target recognition and disrupting p53-MDM2 interaction.
  • The p53 rescue motif peptide represents a promising therapeutic agent against cancers with wild-type p53.
Keywords:
NMR spectroscopySUSP4intrinsically disordered proteinp53pre-structured motif

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