Optineurin Protein

Optineurin (OPTN)

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">Optineurin Protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>OPTINEURIN</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Optineurin</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=OPTINEURIN" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">ALZHEIMER</a>, <a href="/wiki/alzheimer-disease" style="color:#ef9a9a">ALZHEIMER DISEASE</a>, <a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">ALZHEIMER'S DISEASE</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">717 edges</a></td>
</tr>
</table>

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].

Optineurin (OPTN)

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">Optineurin Protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>OPTINEURIN</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>Optineurin</td>
</tr>
<tr>
<td class="label">Type</td>
<td>Protein</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=OPTINEURIN" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">ALZHEIMER</a>, <a href="/wiki/alzheimer-disease" style="color:#ef9a9a">ALZHEIMER DISEASE</a>, <a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">ALZHEIMER'S DISEASE</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">717 edges</a></td>
</tr>
</table>

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).

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