Membrane association but not identity is required for LRRK2 activation and phosphorylation of Rab GTPases

Rachel C. Gomez, Paulina Wawro, Paweł Lis, Dario Alessi, Suzanne R. Pfeffer (Lead / Corresponding author)

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Abstract

LRRK2 kinase mutations cause familial Parkinson’s disease and increased phosphorylation of a subset of Rab GTPases. Rab29 recruits LRRK2 to the trans Golgi and activates it there, yet some of LRRK2’s major Rab substrates are not on the Golgi. We sought to characterize the cell biology of LRRK2 activation Unlike other Rab family members, we show that Rab29 binds nucleotide weakly, is poorly prenylated, and is not bound to GDI in cytosol; nevertheless, Rab29 only activates LRRK2 when it is membrane-bound and GTP-bound. Mitochondrially anchored, GTP-bound Rab29 is both a LRRK2 substrate and activator, and it drives accumulation of active LRRK2 and phospho-Rab10 on mitochondria. Importantly, mitochondrially anchored LRRK2 is much less capable of phosphorylating plasma membrane-anchored Rab10 than soluble LRRK2. These data support a model in which LRRK2 associates with and dissociates from distinct membrane compartments to phosphorylate Rab substrates; if anchored, LRRK2 can modify misdelivered Rab substrates that then become trapped there because GDI cannot retrieve them.
Original languageEnglish
Pages (from-to)4157-4170
Number of pages14
JournalJournal of Cell Biology
Volume218
Issue number12
Early online date17 Oct 2019
DOIs
Publication statusPublished - 2 Dec 2019

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