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Structural Analysis of the Pin1-CPEB1 interaction and its potential role in CPEB1 degradation

Constanze Schelhorn1, Pau Martín-Malpartida1, David Suñol1

  • 1Institute for Research in Biomedicine (IRB Barcelona), The Barcelona Institute of Science and Technology (BIST), Baldiri Reixac 10, Barcelona, 08028, Spain.

Scientific Reports
|October 13, 2015
PubMed

Insights

The peptidyl-prolyl isomerase Pin1 targets the Cytoplasmic Polyadenylation Element Binding protein 1 (CPEB1) for degradation. Unique binding at the pS210 site of CPEB1 by Pin1

Area of Science:

  • Molecular Biology
  • RNA Biology
  • Protein Degradation

Background:

  • Cytoplasmic Polyadenylation Element Binding proteins (CPEB) regulate mRNA translation.
  • CPEB1 degradation is crucial for cell cycle progression and is mediated by SCF(β-TrCP) ligase.
  • The peptidyl-prolyl isomerase Pin1 is implicated in CPEB1 degradation.

Purpose of the Study:

  • To investigate the molecular mechanism of CPEB1 degradation by Pin1.
  • To elucidate the role of specific phosphorylation sites on CPEB1 in Pin1 interaction.
  • To characterize the structural basis of the CPEB1-Pin1 interaction.

Main Methods:

  • Biophysical techniques including Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Structural analysis of the Pin1 WW-CPEB1 pS210 complex (PDB ID: 2n1o).
  • NMR relaxation analyses to study protein dynamics.

Main Results:

  • CPEB1 interacts with Pin1 in a phosphorylation-dependent or -independent manner.
  • The pS210 site on CPEB1 uniquely binds to both the WW and prolyl-isomerase domains of Pin1.
  • Structural data reveals the pSerPro motif of CPEB1 binds in a trans configuration within the Pin1 WW domain.
  • Pin1 inter-domain flexibility is modulated by interaction with pS210-containing peptides, facilitating degradation.

Conclusions:

  • The pS210 site of CPEB1 is a critical determinant for Pin1-mediated degradation.
  • Pin1's dual-domain interaction with CPEB1's pS210 site is essential for regulating CPEB1 stability.
  • Understanding this interaction provides insights into cell cycle control and mRNA translational regulation.

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