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Journal Article
Research Support, Non-U.S. Gov't
LRRK2 functions as a scaffolding kinase of ASK1-mediated neuronal cell death.
Biochimica et Biophysica Acta. Molecular Cell Research 2017 December
Leucine-rich repeat kinase 2 (LRRK2), a multi-domain protein, is a key causative factor in Parkinson's disease (PD). Identification of novel substrates and the molecular mechanisms underlying the effects of LRRK2 are essential for understanding the pathogenesis of PD. In this study, we showed that LRRK2 played an important role in neuronal cell death by directly phosphorylating and activating apoptosis signal-regulating kinase 1 (ASK1). LRRK2 phosphorylated ASK1 at Thr832 that is adjacent to Thr845, which serves as an autophosphorylation site. Moreover, results of binding and kinase assays showed that LRRK2 acted as a scaffolding protein by interacting with each components of the ASK1-MKK3/6-p38 MAPK pathway through its specific domains and increasing the proximity to downstream targets. Furthermore, LRRK2-induced apoptosis was suppressed by ASK1 inhibition in neuronal stem cells derived from patients with PD. These results clearly indicate that LRRK2 acts as an upstream kinase in the ASK1 pathway and plays an important role in the pathogenesis of PD.
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