GTP binding is essential to the protein kinase activity of LRRK2, a causative gene product for familial Parkinson's disease |
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Authors: | Ito Genta Okai Takuro Fujino Go Takeda Kohsuke Ichijo Hidenori Katada Toshiaki Iwatsubo Takeshi |
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Institution: | Department of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo, Bunkyoku, Tokyo, 113-0033 Japan. |
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Abstract: | Leucine-rich repeat kinase 2 (LRRK2), a product of a causative gene for the autosomal-dominant form of familial Parkinson's disease (PARK8), harbors a Ras-like small GTP binding protein-like (ROC) domain besides the kinase domain, although the relationship between these two functional domains remains elusive. Here we show by thin-layer chromatographic analysis that LRRK2 stably binds GTP but lacks a GTPase activity in HEK293 and Neuro-2a cells. A ROC domain mutation that converts LRRK2 to a guanine nucleotide-free form (T1348N) abolishes the kinase activity of LRRK2 as well as its phosphate incorporation upon metabolic labeling. The phosphorylation of LRRK2 was inhibited by potential inhibitors for cyclic AMP-dependent protein kinase. These data suggest that binding of GTP to the ROC domain regulates the kinase activity of LRRK2 as well as its phosphorylation by other kinase(s). |
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