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Phosphorylation of OPTN by TBK1 enhances its binding to Ub chains and promotes selective autophagy of damaged mitochondria
Open accessAbstract
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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“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].”
From Autophagy and ALS: mechanistic insights and therapeutic implications (2022) · cites this paper as [194]
In the citing paper
“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].”
From Autophagy and ALS: mechanistic insights and therapeutic implications (2022) · cites this paper as [194]
In the citing paper
“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).”
From A Cell-Based High-Throughput Screening Identified Two Compounds that Enhance PINK1-Parkin Signaling (2020) · cites this paper as Richter et al., 2016
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Metadata
- 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;
- ORCID
- Venue
- Proceedings of the National Academy of Sciences
- Publisher
- National Academy of Sciences
- Published
- 2016-03-30
- Volume
- 113
- Issue
- 15
- Pages
- 4039-4044
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- PMC
- PMC4839414
- 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
- bronze
- doi.org
- 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
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Autophagy in Disease and Therapy
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
- Health Sciences › Medicine › Clinical 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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