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How IGF-1 activates its receptor.

Jennifer M Kavran1, Jacqueline M McCabe1, Patrick O Byrne1

  • 1Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, United States.

Elife
|September 26, 2014
PubMed
Summary
This summary is machine-generated.

Ligand binding to the type I insulin-like growth factor receptor (IGF1R) releases an autoinhibited state, enabling receptor activation. This process involves transmembrane domain association and subsequent autophosphorylation, leading to full kinase activity.

Keywords:
FRETIGF1 receptorbiochemistrybiophysicshumankineticsmechanismstructural biology

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Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Structural Biology

Background:

  • The type I insulin-like growth factor receptor (IGF1R) is crucial for cellular growth and survival in both normal and cancerous cells.
  • IGF1R activity is regulated by ligand binding, but the precise conformational changes involved remain poorly understood.

Purpose of the Study:

  • To elucidate the mechanism by which ligand binding regulates IGF1R activity.
  • To investigate the role of receptor dimerization and autophosphorylation in IGF1R signaling.

Main Methods:

  • Comparative analysis of crystal structures of the related Insulin Receptor (IR).
  • Biochemical and biophysical assays to study IGF1R ectodomain and full-length receptor function.
  • Enzymatic studies of IGF1R fragments to assess kinase activity.

Main Results:

  • The IGF1R ectodomain exists in an autoinhibited state, with transmembrane (TM) domains held apart.
  • Ligand binding promotes TM association, releasing this autoinhibition.
  • Phosphorylated IGF1R exhibits full kinase activity, independent of ligand or extracellular domains.

Conclusions:

  • Ligand-induced TM association is the critical step initiating IGF1R signaling.
  • Autophosphorylation is the key event triggered by ligand binding, leading to sustained receptor activity.
  • The findings provide a mechanistic understanding of IGF1R activation.