Parkinson's disease-associated mutations in the GTPase domain of LRRK2 impair its nucleotide-dependent conformational dynamics.

J Biol Chem 2019 04 22;294(15):5907-5913. Epub 2019 Feb 22.

From the Departments of Biochemistry and Molecular Biology and

Mutation in leucine-rich repeat kinase 2 (LRRK2) is a common cause of familial Parkinson's disease (PD). Recently, we showed that a disease-associated mutation R1441H rendered the GTPase domain of LRRK2 catalytically less active and thereby trapping it in a more persistently "on" conformation. However, the mechanism involved and characteristics of this on conformation remained unknown. Here, we report that the Ras of complex protein (ROC) domain of LRRK2 exists in a dynamic dimer-monomer equilibrium that is oppositely driven by GDP and GTP binding. We also observed that the PD-associated mutations at residue 1441 impair this dynamic and shift the conformation of ROC to a GTP-bound-like monomeric conformation. Moreover, we show that residue Arg-1441 is critical for regulating the conformational dynamics of ROC. In summary, our results reveal that the PD-associated substitutions at Arg-1441 of LRRK2 alter monomer-dimer dynamics and thereby trap its GTPase domain in an activated state.

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http://dx.doi.org/10.1074/jbc.RA119.007631DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6463707PMC
April 2019
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