eLife (Oct 2023)

Rab12 is a regulator of LRRK2 and its activation by damaged lysosomes

  • Xiang Wang,
  • Vitaliy V Bondar,
  • Oliver B Davis,
  • Michael T Maloney,
  • Maayan Agam,
  • Marcus Y Chin,
  • Audrey Cheuk-Nga Ho,
  • Rajarshi Ghosh,
  • Dara E Leto,
  • David Joy,
  • Meredith EK Calvert,
  • Joseph W Lewcock,
  • Gilbert Di Paolo,
  • Robert G Thorne,
  • Zachary K Sweeney,
  • Anastasia G Henry

DOI
https://doi.org/10.7554/eLife.87255
Journal volume & issue
Vol. 12

Abstract

Read online

Leucine-rich repeat kinase 2 (LRRK2) variants associated with Parkinson’s disease (PD) and Crohn’s disease lead to increased phosphorylation of its Rab substrates. While it has been recently shown that perturbations in cellular homeostasis including lysosomal damage can increase LRRK2 activity and localization to lysosomes, the molecular mechanisms by which LRRK2 activity is regulated have remained poorly defined. We performed a targeted siRNA screen to identify regulators of LRRK2 activity and identified Rab12 as a novel modulator of LRRK2-dependent phosphorylation of one of its substrates, Rab10. Using a combination of imaging and immunopurification methods to isolate lysosomes, we demonstrated that Rab12 is actively recruited to damaged lysosomes and leads to a local and LRRK2-dependent increase in Rab10 phosphorylation. PD-linked variants, including LRRK2 R1441G and VPS35 D620N, lead to increased recruitment of LRRK2 to the lysosome and a local elevation in lysosomal levels of pT73 Rab10. Together, these data suggest a conserved mechanism by which Rab12, in response to damage or expression of PD-associated variants, facilitates the recruitment of LRRK2 and phosphorylation of its Rab substrate(s) at the lysosome.

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