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A Triple-pose Complex Between an Extended WIP Motif and a C-terminal SH3 Domain Modulates Cortactin Activity.

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Researchers identified a novel, extended binding motif between WASp-interacting protein (WIP) and cortactin, revealing multiple binding modes. This discovery offers new strategies for developing therapeutic inhibitors targeting cell invasion and extracellular matrix degradation.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Cell Biology

Background:

  • The interaction between WASp-interacting protein (WIP) and cortactin's SH3 domain is crucial for regulating extracellular matrix (ECM) degradation and cellular invasion.
  • The precise binding motif and structural basis of this interaction have remained largely undefined.

Purpose of the Study:

  • To identify the specific WIP epitope involved in binding to the cortactin SH3 domain.
  • To elucidate the structural mechanisms underlying WIP-cortactin recognition.
  • To explore the potential for designing therapeutic inhibitors based on structural insights.

Main Methods:

  • Nuclear Magnetic Resonance (NMR)-based methods, including edited-filtered NOESY experiments.
  • Scanning mutagenesis analysis of the WIP binding motif.
  • Structural determination of the WIP SH3/peptide complex.

Main Results:

  • Identified an extended WIP epitope (residues 168-183) that binds the cortactin SH3 domain, longer than typical SH3 ligands.
  • Revealed that peptide binding 'hotspots' are distributed across this extended motif.
  • Determined the structure of the complex, showing three interchanging binding modes: two canonical (class I and II) and one non-canonical (pseudo-class II).
  • The non-canonical pose involves C-terminal interactions and highlights the significance of adjacent hydrophobic surfaces.

Conclusions:

  • The WIP-cortactin interaction is mediated by an extended binding motif with multiple conformational possibilities.
  • Structural insights into these binding modes provide a foundation for designing high-affinity WIP-cortactin inhibitors.
  • Targeting this interaction could lead to novel therapeutic strategies for diseases involving aberrant ECM degradation and cell invasion.