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MIRO-1 interacts with VDAC-1 to regulate mitochondrial membrane potential in Caenorhabditis elegans
Xuecong Ren1, Hengda Zhou1,2, Yujie Sun1,2
1Center for Stem Cell and Regenerative Medicine and Department of Burns and Wound Repair of the Second Affiliated Hospital, The Zhejiang University-University of Edinburgh Institute, Zhejiang University School of Medicine, Hangzhou, China.
Abstract:
Precise regulation of mitochondrial fusion and fission is essential for cellular activity and animal development. Imbalances between these processes can lead to fragmentation and loss of normal membrane potential in individual mitochondria. In this study, we show that MIRO-1 is stochastically elevated in individual fragmented mitochondria and is required for maintaining mitochondrial membrane potential. We further observe a higher level of membrane potential in fragmented mitochondria in fzo-1 mutants and wounded animals. Moreover, MIRO-1 interacts with VDAC-1, a crucial mitochondrial ion channel located in the outer mitochondrial membrane, and this interaction depends on the residues E473 of MIRO-1 and K163 of VDAC-1. The E473G point mutation disrupts their interaction, resulting in a reduction of the mitochondrial membrane potential. Our findings suggest that MIRO-1 regulates membrane potential and maintains mitochondrial activity and animal health by interacting with VDAC-1. This study provides insight into the mechanisms underlying the stochastic maintenance of membrane potential in fragmented mitochondria.
Insights
Mitochondrial protein MIRO-1 maintains membrane potential in fragmented mitochondria by interacting with VDAC-1. This interaction is crucial for cellular activity and overall animal health, offering insights into mitochondrial regulation.
Area of Science:
- Cell Biology
- Mitochondrial Dynamics
- Molecular Mechanisms
Background:
- Precise regulation of mitochondrial fusion and fission is vital for cellular function and development.
- Mitochondrial fragmentation can lead to loss of membrane potential, impacting cellular health.
Purpose of the Study:
- To investigate the role of MIRO-1 in maintaining mitochondrial membrane potential, particularly in fragmented mitochondria.
- To identify the interaction between MIRO-1 and VDAC-1 and its functional significance.
Main Methods:
- Stochastic elevation analysis of MIRO-1 in fragmented mitochondria.
- Assessment of mitochondrial membrane potential in wild-type and mutant conditions (fzo-1 mutants, wounded animals).
- Co-immunoprecipitation and point mutation studies to analyze MIRO-1 and VDAC-1 interaction.
Main Results:
- MIRO-1 levels are stochastically elevated in fragmented mitochondria and are essential for maintaining membrane potential.
- Fragmented mitochondria exhibit higher membrane potential in fzo-1 mutants and wounded animals.
- MIRO-1 interacts with VDAC-1 via specific residues (MIRO-1 E473, VDAC-1 K163); mutation E473G disrupts this interaction and reduces membrane potential.
Conclusions:
- MIRO-1 plays a critical role in regulating mitochondrial membrane potential through its interaction with VDAC-1.
- This interaction is key to maintaining mitochondrial activity and animal health, especially under stress conditions.
- The findings elucidate mechanisms for stochastic membrane potential maintenance in fragmented mitochondria.
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