Related Experiment Video

Updated: Jul 12, 2025

Assaying the Kinase Activity of LRRK2 in vitro
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Assaying the Kinase Activity of LRRK2 in vitro

Published on: January 18, 2012

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Structure of LRRK1 and mechanisms of autoinhibition and activation

Janice M Reimer1,2, Andrea M Dickey1,2, Yu Xuan Lin1,2

  • 1Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla, CA, USA.

Nature Structural & Molecular Biology
|October 19, 2023
PubMed

Insights

Structural differences between Leucine Rich Repeat Kinase 1 (LRRK1) and Leucine Rich Repeat Kinase 2 (LRRK2) explain their distinct disease associations. LRRK1 exhibits unique dimer-dependent autoinhibition, unlike LRRK2.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Genetics

Background:

  • Leucine Rich Repeat Kinase 1 (LRRK1) and Leucine Rich Repeat Kinase 2 (LRRK2) are homologous human proteins involved in intracellular trafficking.
  • LRRK2 is associated with familial Parkinson's disease (autosomal dominant gain-of-function mutations), while LRRK1 is linked to bone diseases (autosomal recessive loss-of-function mutations).

Purpose of the Study:

  • To elucidate the structural basis for the differing disease associations of LRRK1 and LRRK2.
  • To understand the distinct mechanisms of autoinhibition in LRRK1 and LRRK2.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) was used to determine the structures of LRRK1 in its monomeric and dimeric forms.
  • Comparative structural analysis of LRRK1 and LRRK2.

Main Results:

  • The structures of LRRK1 monomers and dimers differ significantly from those of LRRK2.
  • LRRK1 displays dimer-dependent steric autoinhibition, contrasting with LRRK2's monomeric autoinhibition.
  • LRRK1 possesses an additional autoinhibition mechanism absent in LRRK2, preventing kinase activation.

Conclusions:

  • The distinct structural features and autoinhibition mechanisms of LRRK1 and LRRK2 underpin their different roles in human diseases.
  • These findings provide insights into the evolutionary divergence of the LRRK protein family.

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