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A Method for Screening and Validation of Resistant Mutations Against Kinase Inhibitors
12:40

A Method for Screening and Validation of Resistant Mutations Against Kinase Inhibitors

Published on: December 7, 2014

Cracking the molecular origin of intrinsic tyrosine kinase activity through analysis of pathogenic gain-of-function

Huaibin Chen1, Zhifeng Huang, Kaushik Dutta

  • 1Department of Biochemistry and Molecular Pharmacology, New York University School of Medicine, New York, NY 10016, USA.

Cell Reports
|July 23, 2013
PubMed

Insights

Pathogenic FGF receptor mutations shift the balance toward an active kinase state, increasing intrinsic activity. This heightened activity correlates with disease severity, highlighting the impact of kinase dynamics on human health.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Receptor tyrosine kinases (RTKs) possess basal kinase activity, enhanced by ligand-induced dimerization and trans-phosphorylation.
  • Understanding the molecular basis of RTK intrinsic activity is crucial for deciphering signaling pathways and disease mechanisms.

Purpose of the Study:

  • To investigate the molecular determinants governing the intrinsic kinase activity of FGF receptors.
  • To elucidate how pathogenic mutations affect the conformational dynamics and activity of FGF receptors.

Main Methods:

  • X-ray crystallography and Nuclear Magnetic Resonance (NMR) spectroscopy were employed.
  • Analysis of pathogenic Fibroblast Growth Factor (FGF) receptor mutants with varying gain-of-function potentials.

Main Results:

  • A "two-state" dynamic equilibrium model was revealed, with kinases alternating between inhibited and active states.
  • Pathogenic mutations differentially modulate this equilibrium, favoring the active state.
  • Increased population of FGF receptors in the active state directly correlates with enhanced gain-of-function activity and clinical severity.

Conclusions:

  • The fractional population of RTKs in the active state dictates intrinsic kinase activity.
  • Even minor shifts toward the active kinase state can lead to severe health consequences.
  • This study provides insights into the structural dynamics underlying RTK-mediated diseases.

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