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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

LRRK2 Parkinson disease mutations enhance its microtubule association

Lauren R Kett1, Daniela Boassa, Cherry Cheng-Ying Ho

  • 1Department of Neurology, University of Michigan Medical School, Ann Arbor, MI, USA.

Human Molecular Genetics
|November 15, 2011
PubMed

Insights

Mutations in leucine-rich repeat kinase 2 (LRRK2) cause Parkinson disease (PD) by forming abnormal filaments that bind to microtubules. This discovery offers new insights into PD pathogenesis and potential therapeutic targets.

Area of Science:

  • Neuroscience
  • Genetics
  • Cell Biology

Background:

  • Dominant mutations in leucine-rich repeat kinase 2 (LRRK2) are the primary genetic cause of Parkinson disease (PD).
  • LRRK2 variants are also identified as risk factors for sporadic PD through genome-wide association studies.
  • The precise mechanisms by which LRRK2 contributes to neurodegeneration are not fully understood, although kinase function is implicated.

Purpose of the Study:

  • To investigate the cellular and structural consequences of LRRK2 mutations associated with Parkinson disease.
  • To elucidate the role of LRRK2 oligomerization and its interaction with cellular components in PD pathogenesis.

Main Methods:

  • Utilized cell line transfections and primary neuronal cultures to study LRRK2 mutant behavior.
  • Employed advanced ultrastructural analyses, including immuno-electron microscopy and electron microscopic tomography.
  • Assessed the requirement of kinase function and specific protein domains (WD40) for observed LRRK2 effects.

Main Results:

  • Most LRRK2 Parkinson disease mutants exhibit enhanced oligomerization, forming filamentous structures.
  • These LRRK2 filaments are recruited onto the cellular microtubule network in an ordered, periodic manner.
  • Microtubule association of LRRK2 filaments necessitates intact kinase activity and the WD40 domain.

Conclusions:

  • LRRK2 mutations induce abnormal filament formation and microtubule association, representing a novel pathogenic mechanism in Parkinson disease.
  • Microtubules may play a significant role in the neurodegenerative processes associated with LRRK2 mutations.
  • Findings suggest potential therapeutic strategies targeting LRRK2-microtubule interactions in PD.

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