Ubiquitin signaling in PINK1/Parkin-dependent mitophagy

PINK1 and Parkin are crucial for the removal of damaged mitochondria, a process linked to Parkinson's disease.

• Mitochondrial quality control is essential for cellular health by eliminating dysfunctional mitochondria.
• The PINK1/Parkin pathway selectively clears damaged mitochondria through a process called mitophagy.
• Upon mitochondrial depolarization, PINK1 accumulates and activates Parkin, initiating a feedback loop of ubiquitination.
• Parkin forms ubiquitin chains on mitochondrial membrane proteins, signaling for their degradation by autophagy adaptors.
• Regulatory kinases like TBK1 and deubiquitinating enzymes such as USP30 influence the efficiency of this process.
• Significant gaps remain in understanding the regulatory mechanisms of PINK1 and Parkin's catalytic function.

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