Accurate MS-based Rab10 phosphorylation stoichiometry determination as readout for LRRK2 activity in Parkinson's disease

Ozge Karayel, Francesca Tonelli, Sebastian Virreira Winter, Philipp Emanuel Geyer, Ying Fan, Esther M. Sammler, Dario Alessi, Martin Steger (Lead / Corresponding author), Matthias Mann (Lead / Corresponding author)

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)
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Pathogenic mutations in the Leucine-rich repeat kinase 2 (LRRK2) are the predominant genetic cause of Parkinson's disease (PD). They increase its activity, resulting in augmented Rab10-Thr73 phosphorylation and conversely, LRRK2 inhibition decreases pRab10 levels. Currently, there is no assay to quantify pRab10 levels for drug target engagement or patient stratification. To meet this challenge, we developed an high accuracy and sensitivity targeted mass spectrometry (MS)-based assay for determining Rab10-Thr73 phosphorylation stoichiometry in human samples. It uses synthetic stable isotope-labeled (SIL) analogues for both phosphorylated and nonphosphorylated tryptic peptides surrounding Rab10-Thr73 to directly derive the percentage of Rab10 phosphorylation from attomole amounts of the endogenous phosphopeptide. The SIL and the endogenous phosphopeptides are separately admitted into an Orbitrap analyzer with the appropriate injection times. We test the reproducibility of our assay by determining Rab10-Thr73 phosphorylation stoichiometry in neutrophils of LRRK2 mutation carriers before and after LRRK2 inhibition. Compared with healthy controls, the PD predisposing mutation carriers LRRK2 G2019S and VPS35 D620N display 1.9-fold and 3.7-fold increased pRab10 levels, respectively. Our generic MS-based assay further establishes the relevance of pRab10 as a prognostic PD marker and is a powerful tool for determining LRRK2 inhibitor efficacy and for stratifying PD patients for LRRK2 inhibitor treatment.

Original languageEnglish
Pages (from-to)1546-1560
Number of pages15
JournalMolecular & Cellular Proteomics
Issue number9
Early online date29 Jun 2020
Publication statusPublished - 1 Sept 2020


  • Selected Ion Monitoring
  • Biomarker: Diagnostic
  • Clinical proteomics
  • Neurodegenerative diseases
  • Parallel reaction monitoring
  • Parkinson's disease
  • Phosphorylation
  • Protein kinases
  • Targeted mass spectrometry
  • Targeted therapies
  • targeted therapies
  • Parkinson disease
  • protein kinases
  • selected ion monitoring
  • targeted mass spectrometry
  • Biomarker: diagnostic
  • neurodegenerative diseases
  • parallel reaction monitoring
  • clinical proteomics
  • phosphorylation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Molecular Biology
  • Biochemistry


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