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Assaying the Kinase Activity of LRRK2 in vitro
06:09

Assaying the Kinase Activity of LRRK2 in vitro

Published on: January 18, 2012

The Parkinson's disease kinase LRRK2 autophosphorylates its GTPase domain at multiple sites

Elisa Greggio1, Jean-Marc Taymans, Eugene Yuejun Zhen

  • 1Cell Biology and Gene Expression Unit, Laboratory of Neurogenetics, National Institute on Aging, Bethesda, MD 20892-3707, USA.

Biochemical and Biophysical Research Communications
|September 8, 2009
PubMed

Insights

Leucine-rich repeat kinase 2 (LRRK2) mutations cause inherited Parkinson's disease. This study identifies Thr1343 as an autophosphorylation site, suggesting complex autoregulation between LRRK2's kinase and GTPase activities.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Mutations in leucine-rich repeat kinase 2 (LRRK2) are a leading genetic cause of Parkinson's disease (PD).
  • Pathogenic LRRK2 mutations often occur in regions encoding GTPase and kinase domains.
  • LRRK2's autophosphorylation, potentially occurring in dimers, is poorly understood.

Purpose of the Study:

  • To map autophosphorylation sites within LRRK2.
  • To investigate the autoregulatory mechanisms of LRRK2 kinase and GTPase activities.

Main Methods:

  • Mass spectrometry was employed to identify phosphorylation sites.
  • Kinase-dead LRRK2 variants were utilized to confirm autophosphorylation.
  • Site-directed mutagenesis and biochemical assays were performed.

Main Results:

  • Thr1343 was identified as a key autophosphorylation site within the LRRK2 GTPase domain.
  • Evidence suggests additional autophosphorylation sites exist in other LRRK2 regions.
  • The kinase and GTPase activities of LRRK2 demonstrate complex autoregulatory interdependence.

Conclusions:

  • LRRK2 autophosphorylation occurs at multiple sites, including Thr1343 in the GTPase domain.
  • These findings illuminate the intricate autoregulation of LRRK2 function.
  • Understanding LRRK2 autophosphorylation is crucial for developing Parkinson's disease therapies.

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