NAB2 is a neuroprotectant that targets the small GTPase Rab1a . NAB2 selectively binds to the GDP-bound form of Rab1a and protects multiple cell types from α-synuclein toxicity by increasing Rab1a expression. Rab1a regulates ER-to-Golgi trafficking and mediates endosomal trafficking events of the E3 ubiquitin ligase Rsp5/Nedd4 . NAB2 stimulates ubiquitination of related proteins in a Nedd4-dependent manner and rescues α-synuclein-associated trafficking defects associated with early-onset Parkinson's disease.
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