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Bit-by-bit autophagic removal of parkin-labelled mitochondria

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  • Jin-Yi Yang

    (Institute of Biological Chemistry, Academia Sinica)

  • Wei Yuan Yang

    (Institute of Biological Chemistry, Academia Sinica
    Institute of Biochemical Sciences, College of Life Sciences, National Taiwan University)

Abstract

Eukaryotic cells maintain mitochondrial integrity through mitophagy, an autophagic process by which dysfunctional mitochondria are selectively sequestered into double-layered membrane structures, termed phagophores, and delivered to lysosomes for degradation. Here we show that small fragments of parkin-labelled mitochondria at omegasome-marked sites are engulfed by autophagic membranes one at a time. Using a light-activation scheme to impair long mitochondrial tubules, we demonstrate that sites undergoing bit-by-bit mitophagy display preferential ubiquitination, and are situated where parkin-labelled mitochondrial tubules and endoplasmic reticulum intersect. Our observations suggest contact regions between the endoplasmic reticulum and impaired mitochondria are initiation sites for local LC3 recruitment and mitochondrial remodelling that support bit-by-bit, parkin-mediated mitophagy. These results help in understanding how cells manage to fit large and morphologically heterogeneous mitochondria into micron-sized autophagic membranes during mitophagy.

Suggested Citation

  • Jin-Yi Yang & Wei Yuan Yang, 2013. "Bit-by-bit autophagic removal of parkin-labelled mitochondria," Nature Communications, Nature, vol. 4(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3428
    DOI: 10.1038/ncomms3428
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