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Oligopeptide Competition Assay for Phosphorylation Site Determination
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A chaperone-dependent GSK3beta transitional intermediate mediates activation-loop autophosphorylation.

Pamela A Lochhead1, Ross Kinstrie, Gary Sibbet

  • 1The Beatson Institute for Cancer Research, Garscube Estate, Switchback Road, Glasgow, G61 1BD. p.lochhead@beatson.gla.ac.uk <p.lochhead@beatson.gla.ac.uk>

Molecular Cell
|December 26, 2006
PubMed
Summary

Glycogen synthase kinase 3 (GSK3) autophosphorylates to activate, acting as a transitional intermediate. This unique mechanism, involving chaperone-dependent Y216 phosphorylation, differs from mature GSK3 and impacts drug discovery.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • Glycogen synthase kinase 3 (GSK3) is crucial in insulin and wnt signaling.
  • GSK3 is constitutively active and regulated by upstream signals.
  • The mechanism and timing of GSK3 activation via tyrosine phosphorylation (Y216) remain unclear.

Purpose of the Study:

  • To elucidate the mechanism of GSK3beta autophosphorylation at Y216.
  • To characterize the transitional intermediate state of GSK3beta.
  • To assess the implications of GSK3 activation mechanisms for drug screening.

Main Methods:

  • Investigated GSK3beta autophosphorylation using biochemical assays.
  • Characterized the chaperone-dependent nature of Y216 phosphorylation.
  • Compared inhibitor sensitivity of transitional and mature GSK3beta forms.

Main Results:

  • GSK3beta autophosphorylates Y216 via a chaperone-dependent transitional intermediate.
  • This intermediate exhibits intramolecular tyrosine kinase activity.
  • Mature GSK3beta functions as an intermolecular serine/threonine kinase, independent of chaperones.
  • Transitional GSK3beta shows different inhibitor sensitivity compared to the mature form.

Conclusions:

  • Autoactivating kinases utilize diverse autophosphorylation mechanisms.
  • GSK3 activation involves a distinct transitional intermediate phase.
  • Conventional drug screens may miss inhibitors targeting the transitional GSK3 intermediate.