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A conserved retromer sorting motif is essential for mitochondrial DLP1 recycling by VPS35 in Parkinson's disease

Wenzhang Wang1, Xiaopin Ma1, Leping Zhou1,2

  • 1Department of Pathology, Case Western Reserve University, Cleveland, OH 44106, USA.

Human Molecular Genetics
|January 2, 2017
PubMed

Insights

Researchers identified a key interaction site between VPS35 and DLP1 proteins, crucial for Parkinson's disease pathogenesis. A novel peptide targeting this site successfully reversed mitochondrial dysfunction in cellular models, offering a potential therapeutic strategy.

Area of Science:

  • Molecular Biology
  • Neuroscience
  • Cell Biology

Background:

  • Mitochondrial dynamics and quality control are critical for cellular health and implicated in Parkinson's disease (PD) pathogenesis.
  • Mutations in VPS35 are linked to autosomal dominant PD, with prior work showing VPS35 mutants enhance VPS35-DLP1 interaction, leading to mitochondrial fragmentation.

Purpose of the Study:

  • To pinpoint the specific interaction sites between VPS35 and DLP1 involved in Parkinson's disease.
  • To investigate the therapeutic potential of targeting the VPS35-DLP1 interaction for mitigating PD-associated mitochondrial deficits.

Main Methods:

  • Identification of a conserved FLV motif in the C-terminus of DLP1 crucial for VPS35 interaction.
  • Design of a decoy peptide based on the FLV motif to block VPS35-DLP1 interaction and inhibit mitochondrial DLP1 complex recycling.
  • Assessment of the peptide's efficacy in rescuing mitochondrial fragmentation and respiratory deficits in cellular models (M17 cells and PD fibroblasts) expressing VPS35 D620N mutant.

Main Results:

  • Mutation of the identified FLV motif in DLP1 significantly reduced VPS35-DLP1 interaction.
  • The decoy peptide successfully blocked VPS35-DLP1 interaction and inhibited mitochondrial DLP1 complex recycling.
  • Treatment with the decoy peptide rescued mitochondrial fragmentation and respiratory deficits caused by the VPS35 D620N mutant in both cell lines.

Conclusions:

  • The VPS35-DLP1 interaction is essential for the retromer-dependent recycling of mitochondrial DLP1 during mitochondrial fission.
  • Targeting the VPS35-DLP1 interaction with a decoy peptide offers a promising therapeutic strategy for Parkinson's disease by controlling excessive mitochondrial fission and deficits.

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