PTEN induced putative kinase 1 (PINK1) (PINK1)

PTEN induced putative kinase 1 (PINK1) is a mitochondrial serine/threonine-protein kinase that serves as a master regulator of mitochondrial quality control through the mitophagy pathway [1, 4]. In healthy mitochondria, PINK1 is imported and rapidly degraded by mitochondrial proteases such as PARL, but upon mitochondrial depolarization or damage, it stabilizes on the outer mitochondrial membrane [1, 14]. Once stabilized, PINK1 phosphorylates both ubiquitin and the E3 ubiquitin ligase Parkin at Serine 65, initiating a feed-forward loop that marks dysfunctional mitochondria for autophagic degradation [4, 6, 22]. Mutations in the PINK1 gene are a primary cause of early-onset autosomal recessive Parkinson's disease (PARK6), as the failure of mitophagy leads to the accumulation of toxic, damaged mitochondria and subsequent neuronal death [1, 16, 21]. Beyond neurodegeneration, PINK1 is implicated in cancer progression, liver injury, and cardiovascular diseases, where its role in maintaining metabolic homeostasis and protecting against oxidative stress is critical [2, 17, 19, 23]. Current therapeutic efforts focus on developing small-molecule PINK1 activators or stabilizers to restore mitophagy in diseased states [3, 5, 10]. However, drug development faces significant challenges, including ensuring mitochondrial specificity to avoid the "sledgehammer effect" of damaging healthy organelles and achieving sufficient blood-brain barrier penetration for neuroprotective applications [9, 11].

Other names

BRPKPARK6PTEN-induced kinase 1Serine/threonine-protein kinase PINK1 mitochondrialPTEN-induced putative kinase protein 1

Activation of the PINK1-Parkin pathway to promote the selective degradation of damaged mitochondria (mitophagy) through direct phosphorylation of ubiquitin and Parkin at the Serine 65 residue.