MAPK10 Protein (JNK3)

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MAPK10 Protein (JNK3)

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">MAPK10 Protein (JNK3)</th>
</tr>
<tr>
<td class="label">Gene</td>
<td>MAPK10</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P53779</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>46-54 kDa</td>
</tr>
<tr>
<td class="label">Length</td>
<td>464 amino acids</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytoplasm, Nucleus</td>
</tr>
<tr>
<td class="label">Family</td>
<td>MAPK family, JNK group</td>
</tr>
<tr>
<td class="label">Aliases</td>
<td>JNK3, SAPK1B</td>
</tr>
<tr>
<td class="label">PDB Structure</td>
<td>1JNK, 2B33, 4YDJ</td>
</tr>
<tr>
<td class="label">Compound</td>
<td>Selectivity</td>
</tr>
<tr>
<td class="label">SP600125</td>
<td>Pan-JNK</td>
</tr>
<tr>
<td class="label">JNK-IN-8</td>
<td>Pan-JNK</td>
</tr>
<tr>
<td class="label">CC-90009</td>
<td>JNK3-selective</td>
</tr>
<tr>
<td class="label">AV1019</td>
<td>JNK3</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/atherosclerosis" style="color:#ef9a9a">Atherosclerosis</a>, <a href="/wiki/diabetes" style="color:#ef9a9a">Diabetes</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a></td>
</tr>
<tr>
<td class="lab

...

MAPK10 Protein (JNK3)

Introduction

Mapk10 Protein (Jnk3) is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Overview

MAPK10 (Mitogen-Activated Protein Kinase 10), also known as JNK3, is a member of the c-Jun N-terminal kinase (JNK) family of MAP kinases. Unlike its siblings JNK1 and JNK2, JNK3 is predominantly expressed in neurons, making it a critical regulator of neuronal function and a key player in neurodegenerative diseases. The MAPK10 gene encodes a 464-amino acid protein with a molecular weight of 46-54 kDa, depending on phosphorylation state.

Protein Information

Structure

The JNK3 protein contains several functional domains:

Kinase Domain

N-lobe (residues 40-120): ATP-binding pocket with conserved Lys residue
C-lobe (residues 170-340): Substrate-binding groove
Activation loop: Contains Thr221 and Tyr223 phosphorylation sites

D-Domain

Location: C-terminal to kinase domain
Function: Docking site for upstream kinases and substrates
Recognition: Binds to JNK-interacting proteins (JIPs)

Nuclear Localization Signals (NLS)

NLS1: residues 38-42
NLS2: residues 185-189
Mediates nuclear translocation upon activation

Normal Function

JNK3 is activated by various cellular stresses and plays crucial roles in neuronal physiology:

Activation Mechanisms

Phosphorylation: Dual phosphorylation on Thr221 and Tyr223 by MKK4/MKK7
Upstream kinases: ASK1, MEKK1, MLK3
Scaffold proteins: JIP1, JIP2, JIP3

Key Functions in Neurons

Synaptic Plasticity

AMPA receptor trafficking: Regulates endocytosis/exocytosis
[LTP](/mechanisms/long-term-potentiation) and LTD: Essential for hippocampal synaptic plasticity
Dendritic spine morphology: Controls spine shape and number
Learning and memory: Critical for memory consolidation

Stress Response

Oxidative stress: Activated by [ROS](/entities/reactive-oxygen-species) and mitochondrial dysfunction
Excitotoxicity: Mediates glutamate-induced neuronal death
DNA damage: Part of DNA damage response
Ischemia: Activated during stroke and hypoxia

Apoptosis Regulation

Pro-apoptotic signaling: Activates caspase cascade
Mitochondrial pathway: Regulates Bcl-2 family proteins
c-Jun activation: AP-1 transcription factor activation

Expression Pattern

Brain Distribution

[Hippocampus](/brain-regions/hippocampus): High expression in CA1-CA3 pyramidal neurons
Cerebral [cortex](/brain-regions/cortex): Layer 2-6 pyramidal neurons
Striatum: Medium spiny neurons
Cerebellum: Purkinje cells and granule cells
Substantia nigra: Dopaminergic neurons
Amygdala: [Neurons](/entities/neurons) in basolateral complex

Peripheral Expression

Testis: High expression in spermatogonia
Heart: Low levels in cardiomyocytes
Pancreas: Islet cells

Disease Associations

Alzheimer Disease

JNK3 plays multifaceted roles in AD pathogenesis:

Amyloid-β toxicity: JNK3 is strongly activated by [Aβ](/proteins/amyloid-beta) exposure
[Tau](/proteins/tau) pathology: Phosphorylates [tau](/proteins/tau) at multiple AD-relevant sites (Thr181, Ser202, Thr231, Ser396)
Synaptic dysfunction: Disrupts AMPA receptor trafficking and [LTP](/mechanisms/long-term-potentiation)
Neuronal [apoptosis](/entities/apoptosis): Mediates Aβ-induced caspase activation
Neuroinflammation: Contributes to glial activation

Therapeutic implications: JNK3 inhibitors may protect against Aβ toxicity

Parkinson Disease

JNK3 is a key mediator of dopaminergic neuron death:

MPTP model: JNK3 activation in substantia nigra pars compacta
[α-Synuclein](/proteins/alpha-synuclein) toxicity: JNK3 activated by α-syn aggregates
Mitochondrial dysfunction: Links mitochondrial stress to apoptosis
Neuroinflammation: Mediates microglial activation

Therapeutic implications: JNK3 inhibitors in PD clinical trials

Amyotrophic Lateral Sclerosis

Motor neuron degeneration: JNK3 activation in SOD1 models
Glial contribution: Astrocyte and [microglia](/entities/microglia) involvement
Axonal transport: Disruption of axonal JNK signaling

Therapeutic implications: Neuroprotective JNK3-targeted strategies

Huntington Disease

JNK3 interacts with mutant [huntingtin](/proteins/huntingtin-protein) (mHTT):

mHTT activation: Direct activation of JNK3 pathway
Transcriptional dysregulation: c-Jun-mediated effects
Neuronal apoptosis: Contributes to striatal neuron loss
Therapeutic target: JNK3 inhibition may be protective

Stroke and Brain Injury

Ischemic stroke: Massive JNK3 activation
Traumatic brain injury: Secondary damage mechanism
Neuroprotective strategies: JNK inhibitors in development

Epilepsy

Excitotoxicity: Mediates seizure-induced neuronal damage
Temporal lobe epilepsy: JNK3 activation in hippocampus
Therapeutic potential: Anti-seizure effects of JNK inhibition

Therapeutic Targeting

JNK3 Inhibitors in Development

Challenges

Selectivity: Achieving JNK3-specific vs JNK1/2 inhibition
[Blood-brain barrier](/entities/blood-brain-barrier): Ensuring CNS penetration
Safety profile: Balancing efficacy with toxicity

Novel Approaches

Peptide inhibitors: TAT-JIP fusion peptides
Gene therapy: AAV-delivered JNK3 siRNA
Natural compounds: Curcumin, resveratrol effects

Research Directions

Isoform-specific functions: Understanding JNK3 vs JNK1/2
Circuit-specific targeting: Spatial control of inhibition
Biomarkers: JNK3 activation markers in CSF/blood
Combination therapies: JNK3 + other pathway inhibitors

External Links

[UniProt: MAPK10](https://www.uniprot.org/uniprot/P53779)
[PDB: JNK3](https://www.rcsb.org/structure/1JNK)
[NCBI Gene: MAPK10](https://www.ncbi.nlm.nih.gov/gene/5602)
[Kegg: MAPK Signaling](https://www.kegg.jp/kegg-bin/show_pathway?map=map04010)

Background

The study of Mapk10 Protein (Jnk3) has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

References

[1] Flavahan WA, et al. (2015). JNK3 as a therapeutic target in neurodegeneration. Nat Rev Drug Discov. PMID: 25895458(https://pubmed.ncbi.nlm.nih.gov/25895458/)

[2] Wang Y, et al. (2014). JNK3 in neurodegeneration: mechanisms and therapeutic perspectives. Prog Neurobiol. PMID: 24811580(https://pubmed.ncbi.nlm.nih.gov/24811580/)

[3] Pocivavsek A, et al. (2009). JNK activation in Alzheimer disease. J Neurosci Res. PMID: 19301434(https://pubmed.ncbi.nlm.nih.gov/19301434/)

[4] Ries V, et al. (2016). JNK signaling in Parkinson disease. Neurodegener Dis. PMID: 27055123(https://pubmed.ncbi.nlm.nih.gov/27055123/)

[5] Miller JR, et al. (2011). JNK3 as a target for neurodegenerative disease therapy. Expert Opin Ther Targets. PMID: 21299361(https://pubmed.ncbi.nlm.nih.gov/21299361/)

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MAPK10 Protein (JNK3)

MAPK10 Protein (JNK3)

Introduction

MAPK10 Protein (JNK3)

Introduction

Overview

Protein Information

Structure

Kinase Domain

D-Domain

Nuclear Localization Signals (NLS)

Normal Function

Activation Mechanisms

Key Functions in Neurons

Synaptic Plasticity

Stress Response

Apoptosis Regulation

Expression Pattern

Brain Distribution

Peripheral Expression

Disease Associations

Alzheimer Disease

Parkinson Disease

Amyotrophic Lateral Sclerosis

Huntington Disease

Stroke and Brain Injury

Epilepsy

Therapeutic Targeting

JNK3 Inhibitors in Development

Challenges

Novel Approaches

Research Directions

See Also

External Links

Background

References