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Related Concept Videos

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Assessing Cellular Target Engagement by SHP2 PTPN11 Phosphatase Inhibitors
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Atomistic ensemble of active SHP2 phosphatase.

Massimiliano Anselmi1, Jochen S Hub2

  • 1Theoretical Physics and Center for Biophysics, Saarland University, 66123, Saarbrücken, Germany. massimiliano.anselmi@uni-saarland.de.

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Researchers modeled the active state of SHP2 phosphatase, crucial for cell signaling and cancer. Molecular dynamics simulations revealed its complex, open structure in solution, aligning with experimental data.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • SHP2 phosphatase regulates critical intracellular signaling pathways.
  • Mutations in SHP2 are implicated in developmental disorders, hematological malignancies, and cancer.
  • The autoinhibited structure of SHP2 is known, but its active conformation remains elusive.

Purpose of the Study:

  • To elucidate the heterogeneous atomistic ensemble of constitutively active SHP2E76K in solution.
  • To understand the conformational dynamics of the oncogenic SHP2E76K mutant, which mimics the active state.
  • To reconcile structural models with experimental data for activated SHP2.

Main Methods:

  • Molecular dynamics (MD) simulations.
  • Explicit-solvent small-angle X-ray scattering (SAXS) curve predictions.
  • Analysis of conformational heterogeneity and radii of gyration.

Main Results:

  • Presented a heterogeneous ensemble of SHP2E76K conformations in solution.
  • Simulated SAXS curves accurately matched experimental data.
  • Characterized the dynamic and diverse structural arrangements of active SHP2.

Conclusions:

  • The active state of SHP2 is not a single structure but a heterogeneous ensemble of conformations.
  • This study provides a dynamic, atomistic view of activated SHP2, essential for understanding its function and developing targeted therapies.
  • Findings offer insights into SHP2 regulation and its role in disease.