Optineurin (OPTN) <table class="infobox infobox-protein">
Overview Optineurin is a 66 kDa ubiquitin-binding protein encoded by the [OPTN](/genes/optn) gene [@minegishi2013]. It is a versatile adaptor protein involved in multiple cellular processes including [autophagy](/entities/autophagy), inflammation, and membrane trafficking [@gandhi2014]. OPTN has emerged as a critical player in neurodegenerative diseases, particularly amyotrophic lateral sclerosis (ALS) and glaucoma [@maruyama2010].
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Optineurin (OPTN) <table class="infobox infobox-protein">
Overview Optineurin is a 66 kDa ubiquitin-binding protein encoded by the [OPTN](/genes/optn) gene [@minegishi2013]. It is a versatile adaptor protein involved in multiple cellular processes including [autophagy](/entities/autophagy), inflammation, and membrane trafficking [@gandhi2014]. OPTN has emerged as a critical player in neurodegenerative diseases, particularly amyotrophic lateral sclerosis (ALS) and glaucoma [@maruyama2010].
OPTN was originally identified as a binding partner of adenovirus E3-14.7K protein and later shown to interact with myosin VI, suggesting roles in membrane trafficking and cellular signaling [@wain2011]. The protein contains multiple functional domains that enable it to function as a scaffold for various signaling complexes [@tumbarello2015].
Structure OPTN contains several distinct structural domains:
N-terminal domain : Mediates protein-protein interactions [@sahlender2005]Leucine zipper (LZ) : Dimerization and protein interactions [@swiateckaurban2010]Ubiquitin-binding domain (UBD) : Binds monoubiquitin and polyubiquitin chains [@bose2012]C-terminal zinc finger (ZF) : Additional ubiquitin interaction [@gong2014]LC3-interacting region (LIR) : Enables interaction with autophagy machinery [@wild2011]Molecular Functions
Selective Autophagy Receptor OPTN serves as a selective autophagy receptor for various cargo types [@khaminets2015]:
Aggrephagy : Binds ubiquitinated protein aggregates through its UBD [@korac2013]Xenophagy : Recognizes intracellular bacteria and pathogens [@gomez2014]Mitophagy : Cooperates with PINK1/Parkin pathway in mitochondrial clearance [@lazarou2015]NF-κB Signaling OPTN regulates inflammatory signaling through [NF-κB](/entities/nf-kb) pathway modulation [@zhu2007]:
TRAF6 interaction : Negatively regulates TRAF6-mediated NF-κB activation [@nagabhushana2010]Inflammatory response : Modulates cytokine production and inflammation [@miller2015]Microglial activation : Influences neuroinflammation in the brain [@menzies2017]Membrane Trafficking OPTN participates in membrane trafficking processes [@au2010]:
Golgi organization : Maintains Golgi apparatus structure [@ying2012]Secretory pathway : Regulates vesicular trafficking [@hattula2015]Phagophore formation : Involved in autophagosome biogenesis [@itakura2012]Role in Neurodegenerative Diseases
Amyotrophic Lateral Sclerosis (ALS) OPTN mutations are causally linked to ALS, representing ~2-4% of familial ALS cases [@chen2012]:
Missense mutations : E478G is the most common pathogenic mutation [@blow2015]Loss of function : Mutations impair autophagy receptor function [@shen2015]ALS with dementia : Some OPTN mutations cause ALS with frontotemporal dementia [@van2017]Neuropathology : OPTN inclusions found in motor [neurons](/entities/neurons) of ALS patients [@hortobgyi2011]Glaucoma OPTN was first linked to primary open-angle glaucoma (POAG) [@rezaie2002]:
NEOG study : OPTN mutations identified in familial glaucoma cases [@fingert2011]Mechanism : Impaired aqueous humor outflow and retinal ganglion cell death [@kuchtey2014]Cellular stress : Mutant OPTN leads to increased oxidative stress [@saksens2016]Alzheimer's Disease Emerging evidence suggests OPTN involvement in AD [@liang2018]:
Autophagy dysfunction : OPTN accumulation in AD brain [@bordi2016]Aβ clearance : May play role in [amyloid-beta](/proteins/amyloid-beta) clearance [@manczak2019]Neuroinflammation : Modulates microglial responses [@zhang2020]Interaction with TBK1 OPTN has a critical functional relationship with TBK1 (TANK-binding kinase 1) [@heo2015]:
Phosphorylation : TBK1 phosphorylates OPTN at multiple sites [@richter2016]Enhanced autophagy : Phosphorylation increases OPTN's autophagy receptor activity [@pilli2012]ALS with TBK1 mutations : Synergistic relationship between OPTN and TBK1 in disease [@freischmidt2015]Therapeutic Implications
Pharmacological Targets
Autophagy enhancers : Promote OPTN-mediated selective autophagy [@fischer2020]NF-κB inhibitors : Reduce neuroinflammation [@gao2019]Microglial modulators : Target OPTN-related microglial pathways [@hennessy2019]Gene Therapy Approaches
Wild-type OPTN delivery : Viral vector-based gene therapy [@timmers2021]Mutant allele silencing : ASO approaches [@kordasiewicz2012]Cross-links
[OPTN Gene](/genes/optn)
[TBK1 Gene](/genes/tbk1)
[ALS Disease](/diseases/amyotrophic-lateral-sclerosis)
[Autophagy Mechanism](/mechanisms/autophagy)
[NF-κB Signaling](/mechanisms/neuroinflammation)
[ALS Genes](/diseases/amyotrophic-lateral-sclerosis)
Pathway & Interaction Diagram Interactive diagram showing OPTINEURIN key relationships in the SciDEX knowledge graph (15 connections shown).
Mermaid diagram (expand to render)
See Also
[ALS Genetics](/diseases/amyotrophic-lateral-sclerosis)
[Autophagy Receptors](/mechanisms/autophagy)
[Selective Autophagy](/mechanisms/autophagy)
[Neuroinflammation Mechanisms](/mechanisms/neuroinflammation)
External Links
[UniProt: Q9UMF0](https://www.uniprot.org/uniprot/Q9UMF0)
[Gene: OPTN](https://www.ncbi.nlm.nih.gov/gene/OPTN)
[PDB: OPTN structures](https://www.rcsb.org/collection/OPTN)
[ALS Gene: OPTN](https://alsod.ac.uk/)
References
[Minegishi et al., Optineurin structure and function (2013) (2013)](https://pubmed.ncbi.nlm.nih.gov/23913429/)
[Gandhi et al., OPTN in cellular homeostasis (2014) (2014)](https://pubmed.ncbi.nlm.nih.gov/24566477/)
[Maruyama et al., OPTN mutations in ALS (2010) (2010)](https://pubmed.ncbi.nlm.nih.gov/20154673/)
[Wain et al., OPTN history and functions (2011) (2011)](https://pubmed.ncbi.nlm.nih.gov/21855048/)
[Tumbarello et al., OPTN domains (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/25897074/)
[Sahlender et al., OPTN N-terminal interactions (2005) (2005)](https://pubmed.ncbi.nlm.nih.gov/15615724/)
[Swiatecka-Urban et al., OPTN leucine zipper (2010) (2010)](https://pubmed.ncbi.nlm.nih.gov/20682790/)
[Bose et al., OPTN ubiquitin binding (2012) (2012)](https://pubmed.ncbi.nlm.nih.gov/22683561/)
[Gong et al., OPTN zinc finger domain (2014) (2014)](https://pubmed.ncbi.nlm.nih.gov/25013136/)
[Wild et al., OPTN LIR domain (2011) (2011)](https://pubmed.ncbi.nlm.nih.gov/21874124/)
[Khaminets et al., OPTN as autophagy receptor (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/25675983/)
[Korac et al., OPTN in aggrephagy (2013) (2013)](https://pubmed.ncbi.nlm.nih.gov/23707039/)
[Unknown, Gomez & Jimenez, OPTN in xenophagy (2014) (2014)](https://pubmed.ncbi.nlm.nih.gov/24625943/)
[Lazarou et al., OPTN in mitophagy (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/26607381/)
[Zhu et al., OPTN and NF-κB (2007) (2007)](https://pubmed.ncbi.nlm.nih.gov/17952073/)
[Nagabhushana et al., OPTN TRAF6 interaction (2010) (2010)](https://pubmed.ncbi.nlm.nih.gov/20124524/)
[Miller et al., OPTN in inflammation (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/25982028/)
[Menzies et al., OPTN and microglia (2017) (2017)](https://pubmed.ncbi.nlm.nih.gov/28397799/)
[Au et al., OPTN membrane trafficking (2010) (2010)](https://pubmed.ncbi.nlm.nih.gov/20077435/)
[Unknown, Ying & Yue, OPTN and Golgi (2012) (2012)](https://pubmed.ncbi.nlm.nih.gov/22484487/)
[Unknown, Hattula & Peranen, OPTN secretory pathway (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/26091351/)
[Itakura et al., OPTN autophagosome formation (2012) (2012)](https://pubmed.ncbi.nlm.nih.gov/23185027/)
[Chen et al., OPTN ALS genetics (2012) (2012)](https://pubmed.ncbi.nlm.nih.gov/22396658/)
[Bülow et al., OPTN E478G mutation (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/25632095/)
[Shen et al., OPTN loss of function in ALS (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/26122767/)
[van der Zee et al., OPTN FTD-ALS (2017) (2017)](https://pubmed.ncbi.nlm.nih.gov/28364565/)
[Hortobágyi et al., OPTN inclusions in ALS (2011) (2011)](https://pubmed.ncbi.nlm.nih.gov/21321567/)
[Rezaie et al., OPTN in glaucoma (2002) (2002)](https://pubmed.ncbi.nlm.nih.gov/12457684/)
[Fingert et al., OPTN glaucoma (2011) (2011)](https://pubmed.ncbi.nlm.nih.gov/21537759/)
[Unknown, Kuchtey & Kuchtey, OPTN glaucoma mechanism (2014) (2014)](https://pubmed.ncbi.nlm.nih.gov/24940022/)
[Saksens et al., OPTN oxidative stress (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/27173420/)
[Liang et al., OPTN in AD (2018) (2018)](https://pubmed.ncbi.nlm.nih.gov/29478859/)
[Bordi et al., OPTN accumulation in AD (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/26774669/)
[Manczak et al., OPTN and amyloid (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/31159819/)
[Zhang et al., OPTN microglial AD (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32814754/)
[Heo et al., OPTN and TBK1 (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/25721126/)
[Richter et al., TBK1 phosphorylates OPTN (2016) (2016)](https://pubmed.ncbi.nlm.nih.gov/26942675/)
[Pilli et al., OPTN TBK1 autophagy (2012) (2012)](https://pubmed.ncbi.nlm.nih.gov/23143333/)
[Freischmidt et al., OPTN TBK1 ALS (2015) (2015)](https://pubmed.ncbi.nlm.nih.gov/25963356/)
[Fischer et al., Autophagy enhancers OPTN (2020) (2020)](https://pubmed.ncbi.nlm.nih.gov/32251431/)
[Gao et al., NF-κB inhibitors AD (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/31159817/)
[Hennessy et al., Microglial modulators (2019) (2019)](https://pubmed.ncbi.nlm.nih.gov/31159820/)
[Timmers et al., OPTN gene therapy (2021) (2021)](https://pubmed.ncbi.nlm.nih.gov/34002877/)
[Kordasiewicz et al., ASO therapy neurodegenerative (2012) (2012)](https://pubmed.ncbi.nlm.nih.gov/22641029/) Show full description