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A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...
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The inner mitochondrial membrane is the primary site of ATP synthesis. The inner membrane domain that forms a smooth layer adjacent to the outer membrane is called the inner boundary membrane. This domain contains membrane transporters that drive metabolites in and out of the mitochondria.  In contrast, the inner membrane network that invaginates into the matrix space is called the cristae membrane. This domain accounts for principle mitochondrial function as it accommodates the protein...
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A New biosensor illuminates the driving force behind mitochondrial outer membrane rupture.

Wei-Hua Chu1,2, Wei-Chung Chiang1,2,3

  • 1Program in Molecular Medicine, National Yang Ming Chiao Tung University and Academia Sinica, Taipei, Taiwan.

Autophagy Reports
|February 20, 2026
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Summary

Outer mitochondrial membrane (OMM) rupture is vital for mitophagy. A new fluorescent biosensor visualizes this process, revealing that valosin-containing protein (VCP) is essential for OMM rupture during mitophagy.

Keywords:
BiosensorMitochondrial outer membrane ruptureMitochondrial quality controlPINK1/Parkin-mediated mitophagyVCP

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Mitophagy, the selective degradation of mitochondria, is crucial for cellular health.
  • PTEN induced kinase 1 (PINK1)/Parkin (PRKN)-mediated mitophagy requires outer mitochondrial membrane (OMM) rupture to expose inner mitochondrial membrane (IMM) receptors.
  • The precise mechanism and monitoring of OMM rupture in mitophagy remain challenging.

Purpose of the Study:

  • To develop a novel method for direct visualization of OMM rupture during mitophagy.
  • To elucidate the molecular mechanisms underlying OMM rupture in mitophagy.
  • To identify key proteins involved in OMM rupture.

Main Methods:

  • Development of a novel fluorescent biosensor to visualize OMM rupture.
  • Temporal and spatial characterization of OMM rupture using the biosensor.
  • Investigation of protein involvement in OMM rupture through molecular assays.

Main Results:

  • A novel fluorescent biosensor successfully visualized OMM rupture in real-time.
  • The study identified valosin-containing protein (VCP) and its recruitment factors as essential for OMM rupture.
  • VCP-dependent remodeling of the OMM proteome was implicated in priming OMM for rupture.

Conclusions:

  • The developed fluorescent biosensor provides a powerful tool to study OMM rupture in mitophagy.
  • VCP plays a critical role in mediating OMM rupture during PINK1/PRKN-mediated mitophagy.
  • Understanding VCP's role opens new avenues for investigating mitochondrial quality control mechanisms.