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Related Experiment Videos

Autophosphorylation induces autoactivation and a decrease in the Src homology 2 domain accessibility of the Lyn

N Sotirellis1, T M Johnson, M L Hibbs

  • 1Department of Biochemistry and Molecular Biology, University of Melbourne, Parkville, Victoria, Australia.

The Journal of Biological Chemistry
|December 15, 1995
PubMed
Summary

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Lyn protein autophosphorylation significantly boosts kinase activity by altering its structure. This regulation impacts Lyn

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • Lyn is a member of the Src family of protein-tyrosine kinases.
  • Protein-tyrosine kinases play crucial roles in cellular signaling pathways.
  • Autophosphorylation is a key regulatory mechanism for kinase activity.

Purpose of the Study:

  • To investigate the mechanism and consequences of Lyn autophosphorylation.
  • To elucidate how autophosphorylation affects Lyn's kinase activity and substrate binding.
  • To examine the impact of autophosphorylation on the Lyn Src homology 2 (SH2) domain.

Main Methods:

  • In vitro autophosphorylation assays.
  • Kinetic analysis of substrate peptide phosphorylation.
  • Assessment of SH2 domain accessibility using phosphotyrosine-containing peptides.

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Main Results:

  • Lyn autophosphorylation occurs at Tyr397 via an intermolecular mechanism.
  • Autophosphorylation increases Lyn kinase activity 17-fold, primarily by decreasing Km.
  • Autophosphorylation reduces SH2 domain accessibility, indicating conformational changes.

Conclusions:

  • Autophosphorylation is a critical regulatory process for Lyn.
  • It enhances kinase activity by improving substrate binding.
  • Conformational changes propagate from the kinase to the SH2 domain, affecting interactions.