[No authors listed]
Mutations in LRRK2 are linked to autosomal dominant forms of Parkinson's disease. We identified two human proteins that bind to LRRK2: BAG2 and HSC70, which are known to form a chaperone complex. We characterized the role of their Caenorhabditis elegans homologues, UNC-23 and HSP-1, in the regulation of LRK-1, the sole homologue of human LRRK2. In C. elegans, LRK-1 determines the polarized sorting of synaptic vesicle (SV) proteins to the axons by excluding SV proteins from the dendrite-specific transport machinery in the Golgi. In unc-23 mutants, SV proteins are localized to both presynaptic and dendritic endings in neurons, a phenotype also observed in lrk-1 deletion mutants. Furthermore, we isolated mutations in the hsp-1 gene that can suppress the unc-23, but not the lrk-1 defect. We show that UNC-23 determines LRK-1 localization to the Golgi apparatus in cooperation with HSP-1. These results describe a chaperone-dependent mechanism through which LRK-1 localization is regulated.
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