Parkin (E3 ubiquitin-protein ligase Parkin) (Parkin)

Parkin is an E3 ubiquitin ligase enzyme encoded by the PARK2 gene, crucial in the ubiquitin-proteasome system. It tags substrate proteins with ubiquitin to mark them for degradation, thus playing a central role in protein homeostasis and cellular quality control. Parkin is particularly important for the removal of damaged mitochondria (mitophagy), acting in concert with the kinase PINK1. Mutations in Parkin are causally linked to autosomal recessive juvenile Parkinson's disease, and dysregulation of Parkin-mediated ubiquitination is implicated in broader neurodegenerative processes. Substrates of Parkin include various mitochondrial and cytosolic proteins, such as synphilin-1, CDC-rel1, cyclin E, p38 tRNA synthase, Pael-R, synaptotagmin XI, and parkin itself. Parkin interacts with components of the proteasome machinery and possesses a complex multi-domain structure enabling specific substrate recognition and regulation. No drugs directly targeting Parkin are clinically approved, but modulation of its activity remains a highly active field of research for neuroprotection and disease-modifying therapies.

Other names

Parkinson disease protein 2Parkin RBR E3 ubiquitin-protein ligasePARK2

Targeting Parkin or its pathway typically aims to enhance its E3 ligase activity, promote clearance of damaged mitochondria (mitophagy), or modulate degradation of toxic proteins implicated in neurodegeneration