Cited by 758Autophagy in Disease and TherapyUbiquitin and proteasome pathwaysParkinson's Disease Mechanisms and Treatments

Phosphorylation of OPTN by TBK1 enhances its binding to Ub chains and promotes selective autophagy of damaged mitochondria

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Richter, Benjamin, Sliter, Danielle A., Herhaus, Lina, Stolz, Alexandra, Wang, Chunxin, Beli, Petra, Zaffagnini, Gabriele, Wild, Philipp +4 more·2016·Proceedings of the National Academy of Sciences

Abstract

Significance: Selective autophagy of damaged mitochondria (mitophagy) requires protein kinases PINK1 and TBK1, ubiquitin ligase Parkin, and autophagy receptors such as OPTN, driving ubiquitin-labeled mitochondria into autophagosomes. Because all proteins have been genetically linked to either Parkinson’s disease (PINK1 and Parkin) or amyotrophic lateral sclerosis and frontotemporal lobar degeneration (TBK1 and OPTN), it is of great interest to understand their physiological functions. By utilizing quantitative proteomics we show that TBK1 phosphorylates four receptors on several autophagy-relevant sites. Constitutive interaction of TBK1 with OPTN and the ability of OPTN to bind to ubiquitin chains are essential for TBK1 recruitment and activation on mitochondria. TBK1-mediated phosphorylation of OPTN creates a signal amplification loop through combining recruitment and retention of OPTN/TBK1 on ubiquitinated mitochondria.

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Crossref · 10.1073/pnas.1523926113

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  • 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].”
  • OPTN is an autophagy receptor that binds ubiquitinated cargo via its UBAN domain and LC3 via its LIR domain, although it can also act independently of target ubiquitination.

    “OPTN is an autophagy receptor that binds ubiquitinated cargo (via its UBAN domain) and LC3 (via its LIR domain) [194,254,255], although it can also act independently of target ubiquitination [254].”
  • Mitochondrial protein ubiquitination promotes mitochondrial recruitment of autophagy regulators and receptors such as TBK1 and optineurin.

    “Mitochondrial protein ubiquitination promotes mitochondrial recruitment of autophagy regulators and receptors such as TBK1 and optineurin (Heo et al., 2015, Matsumoto et al., 2015, Richter et al., 2016).”

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Research works printed but not linked: 1

  1. Fecto F, et al. (2011) SQSTM1 mutations in familial and sporadic amyotrophic lateral sclerosis. Arch Neurol 68(11):1440-1446.

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Authors
Richter, B., Sliter, D. A., Herhaus, L., Stolz, A., Wang, C., Beli, P., Zaffagnini, G., Wild, P., Martens, S., Wagner, S. A., Youle, R. J., & Dikic, I.
Affiliations
  • Goethe University Frankfurt (DE)
  • National Institutes of Health (US)
  • Institute of Molecular Biology (DE)
  • University of Vienna (AT)
  • Institute of Biochemistry II, Goethe University School of Medicine, 60590 Frankfurt, Germany;
Venue
Proceedings of the National Academy of Sciences
Published
2016-03-30
Volume
113
Issue
15
Pages
4039-4044
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2323582440
Cited by
755
References
44
Citations by year
2026: 64 · 2025: 69 · 2024: 71 · 2023: 56 · 2022: 80 · 2021: 95 · 2020: 82 · 2019: 74 · 2018: 77 · 2017: 60 · 2016: 27
FWCI
74.58
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Deutsche Forschungsgemeinschaft (DI 931/3-1)
  • Cluster of Excellence (EXC115)
Topics
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
Keywords
optineurin, TBK1, phosphorylation, selective autophagy, mitophagy, damaged mitochondria, ubiquitin chains, autophagy receptors, NDP52, TAX1BP1, p62, PINK1, Parkin, signal amplification
MeSH terms
Autophagy, HeLa Cells, Humans, Mitochondria, Phosphorylation, Protein Binding, Protein Serine-Threonine Kinases, Cell Cycle Proteins, Ubiquitin, Membrane Transport Proteins, Transcription Factor TFIIIA

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