Cited by 906Autophagy in Disease and TherapyParkinson's Disease Mechanisms and TreatmentsUbiquitin and proteasome pathways

The PINK1-PARKIN Mitochondrial Ubiquitylation Pathway Drives a Program of OPTN/NDP52 Recruitment and TBK1 Activation to Promote Mitophagy

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Heo, Jin-Mi, Ordureau, Alban, Paulo, Joao A., Rinehart, Jesse, Harper, J. Wade·2015·Molecular Cell

Abstract

Damaged mitochondria are detrimental to cellular homeostasis. One mechanism for removal of damaged mitochondria involves the PINK1-PARKIN pathway, which poly-ubiquitylates damaged mitochondria to promote mitophagy. We report that assembly of ubiquitin chains on mitochondria triggers autophagy adaptor recruitment concomitantly with activation of the TBK1 kinase, which physically associates with OPTN, NDP52, and SQSTM1. TBK1 activation in HeLa cells requires OPTN and NDP52 and OPTN ubiquitin chain binding. In addition to the known role of S177 phosphorylation in OPTN on ATG8 recruitment, TBK1-dependent phosphorylation on S473 and S513 promotes ubiquitin chain binding in vitro as well as TBK1 activation, OPTN mitochondrial retention, and efficient mitophagy in vivo. These data reveal a self-reinforcing positive feedback mechanism that coordinates TBK1-dependent autophagy adaptor phosphorylation with the assembly of ubiquitin chains on mitochondria to facilitate efficient mitophagy, and mechanistically links genes mutated in Parkinson's disease and amyotrophic lateral sclerosis in a common selective autophagy pathway.

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Crossref · 10.1016/j.molcel.2015.08.016

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  • pUbS65 accumulates with mitochondrial stress, age, and disease and serves as a specific signal for recognition by autophagy receptors.

    “Moreover, pUbS65 has been suggested to accumulate with mitochondrial stress, age, and disease [19] and to serve as a specific signal for recognition by autophagy receptors [20, 21].”

    From miR-27a and miR-27b regulate autophagic clearance of damaged mitochondria by targeting PTEN-induced putative kinase 1 (PINK1) (2016) · cites this paper as [20]

    The citation to this paper concerns pUbS65 as a specific signal for autophagy-receptor recognition; the accumulation claim is attached to [19]. In the Results ("Focal localization of p-TBK1S172 with OPTN on depolarized mitochondria"), the authors conclude that p-S65 UB alone does not specify sites of adaptor recruitment. The Discussion likewise says p-S65 UB does not exclusively dictate those sites. (LLM, conf=0.88)

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  • ATG9A has been linked to OPTN, which plays an important role as an adapter for PINK1-PRKN mitophagy.

    “has been linked to OPTN, which plays an important role as an adapter for PINK1-PRKN mitophagy [12, 34, 35].”

    From miRNA family miR-29 inhibits PINK1-PRKN signaling via ATG9A (2026) · cites this paper as [35]

    The Discussion reports that PARKIN-mediated mitochondrial ubiquitylation recruits autophagy adaptors, including OPTN, and promotes mitophagy. That supports OPTN’s role in PINK1-PARKIN mitophagy, but the passages retrieved for ATG9A and OPTN do not establish a link between those two proteins. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • TBK1 amplifies mitophagy signaling by phosphorylating OPTN and SQSTM1, enhancing their binding to ubiquitin and LC3, and promoting TBK1 autophosphorylation in a positive-feedback manner.

    “Additionally, TBK1 amplifies the signaling cascade for mitophagy by phosphorylating OPTN and SQSTM1 (which enhances binding to ubiquitin and LC3) and promoting TBK1 autophosphorylation in a positive-feedback manner [58,59].”
  • Through phosphorylation of the autophagy receptors OPTN, SQSTM1, and CALCOCO2/NDP52, TBK1 regulates macroautophagy, xenophagy and mitophagy.

    “Through its phosphorylation of the autophagy receptors OPTN, SQSTM1, and CALCOCO2/NDP52 (calcium binding and coiled-coil domain 2) [58,59,194], TBK1 regulates several aspects of autophagy, including macroautophagy, xenophagy and mitophagy [59,90,148,194–196].”
  • Whether TBK1 acts on autophagy or innate immunity may partially depend on its associations with specific adaptor proteins such as NAP1L1, TANK and TBKBP1/SINTBAD that bind in a mutually exclusive manner.

    “Whether TBK1 acts on autophagy or innate immunity may partially depend on its associations with specific adaptor proteins such as NAP1L1 (nucleosome assembly protein 1), TANK and TBKBP1/SINTBAD that bind in a mutually exclusive manner [58,200,201].”

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Authors
Heo, J.-M., Ordureau, A., Paulo, J. A., Rinehart, J., & Harper, J. W.
Affiliations
  • Harvard University (US)
  • Yale University (US)
Corresponding author
Harper, J. Wade
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2015-10
Volume
60
Issue
1
Pages
7-20
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2149200223
Cited by
906
References
43
Citations by year
2026: 81 · 2025: 99 · 2024: 84 · 2023: 64 · 2022: 87 · 2021: 111 · 2020: 87 · 2019: 70 · 2018: 74 · 2017: 78 · 2016: 67 · 2015: 3
FWCI
58.28
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute of General Medical Sciences (R01GM095567, GM095567)
  • National Institute of Diabetes and Digestive and Kidney Diseases (K01DK098285)
  • National Institute of Neurological Disorders and Stroke (R37NS083524)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
PINK1/Parkin pathway, mitophagy, optineurin, NDP52, p62, TBK1 phosphorylation, Parkinson's disease, amyotrophic lateral sclerosis, selective autophagy, positive feedback loop
MeSH terms
Sequestosome-1 Protein, PTEN-Induced Putative Kinase, HeLa Cells, Humans, Mitochondria, Nuclear Proteins, Phosphorylation, Protein Kinases, Protein Serine-Threonine Kinases, Cell Cycle Proteins, Membrane Transport Proteins, Transcription Factor TFIIIA, Proteomics, Ubiquitin-Protein Ligases, Adaptor Proteins, Signal Transducing, Ubiquitination, Mitophagy

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