PTK2B/PYK2 Protein

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PTK2B/PYK2 Protein

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PTK2B/PYK2 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">PTK2B/PYK2 Protein</th>
</tr>
<tr>
<td class="label">Domain</td>
<td>Position</td>
</tr>
<tr>
<td class="label">N-terminal FERM domain</td>
<td>1-400</td>
</tr>
<tr>
<td class="label">Proline-rich region 1</td>
<td>400-450</td>
</tr>
<tr>
<td class="label">Kinase domain</td>
<td>450-680</td>
</tr>
<tr>
<td class="label">Proline-rich region 2</td>
<td>680-750</td>
</tr>
<tr>
<td class="label">C-terminal focal adhesion targeting (FAT)</td>
<td>750-1009</td>
</tr>
<tr>
<td class="label">Substrate</td>
<td>Function</td>
</tr>
<tr>
<td class="label">Src family kinases</td>
<td>Further signal amplification</td>
</tr>
<tr>
<td class="label">p130Cas</td>
<td>Cytoskeletal organization</td>
</tr>
<tr>
<td class="label">paxillin</td>
<td>Focal adhesion assembly</td>
</tr>
<tr>
<td class="label">ERK1/2</td>
<td>MAPK signaling</td>
</tr>
<tr>
<td class="label">PSD-95</td>
<td>Synaptic plasticity</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Status</td>
</tr>
<tr>
<td class="label">Small molecule inhibitors</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Peptide inhibitors</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Experimental</td>
</tr>
<tr>
<td class="label">Associated Di

...

PTK2B/PYK2 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">PTK2B/PYK2 Protein</th>
</tr>
<tr>
<td class="label">Domain</td>
<td>Position</td>
</tr>
<tr>
<td class="label">N-terminal FERM domain</td>
<td>1-400</td>
</tr>
<tr>
<td class="label">Proline-rich region 1</td>
<td>400-450</td>
</tr>
<tr>
<td class="label">Kinase domain</td>
<td>450-680</td>
</tr>
<tr>
<td class="label">Proline-rich region 2</td>
<td>680-750</td>
</tr>
<tr>
<td class="label">C-terminal focal adhesion targeting (FAT)</td>
<td>750-1009</td>
</tr>
<tr>
<td class="label">Substrate</td>
<td>Function</td>
</tr>
<tr>
<td class="label">Src family kinases</td>
<td>Further signal amplification</td>
</tr>
<tr>
<td class="label">p130Cas</td>
<td>Cytoskeletal organization</td>
</tr>
<tr>
<td class="label">paxillin</td>
<td>Focal adhesion assembly</td>
</tr>
<tr>
<td class="label">ERK1/2</td>
<td>MAPK signaling</td>
</tr>
<tr>
<td class="label">PSD-95</td>
<td>Synaptic plasticity</td>
</tr>
<tr>
<td class="label">Approach</td>
<td>Status</td>
</tr>
<tr>
<td class="label">Small molecule inhibitors</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Peptide inhibitors</td>
<td>Research</td>
</tr>
<tr>
<td class="label">Gene therapy</td>
<td>Experimental</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/alzheimer's-disease" style="color:#ef9a9a">Alzheimer's disease</a>, <a href="/wiki/huntington's-disease" style="color:#ef9a9a">Huntington's disease</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">131 edges</a></td>
</tr>
</table>

Ptk2B Pyk2 Protein 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

PTK2B (Protein Tyrosine Kinase 2 Beta), also known as PYK2 (Proline-Rich Tyrosine Kinase 2), is a non-receptor tyrosine kinase that plays critical roles in cell signaling, synaptic plasticity, and cellular responses to various stimuli. PTK2B is widely expressed in the brain and is involved in numerous signaling pathways that regulate neuronal function, survival, and plasticity. Genetic variants in PTK2B have been associated with Alzheimer's disease risk.

Structure

PTK2B is a 115 kDa non-receptor tyrosine kinase:

Domain Architecture

Key Features

Autophosphorylation sites: Y402 (major autophosphorylation site)
SH2 binding sites: Multiple tyrosine phosphorylation sites
Focal adhesion targeting: Localizes to focal adhesions

Molecular Function

Signaling Pathways

PTK2B is activated by various stimuli:

Calcium influx: Ca²⁺-dependent activation

G-protein coupled receptors: Various GPCR agonists

Integrin signaling: Cell adhesion

Growth factors: PDGF, EGF, NGF

Stress stimuli: UV radiation, oxidative stress

Key Substrates

Cellular Functions

PTK2B regulates:

Cell migration: Cytoskeletal dynamics
Synaptic plasticity: Activity-dependent modifications
Gene transcription: MAPK activation
Cell survival: Anti-apoptotic signaling
Calcium signaling: Modulates Ca²⁺ responses

Expression Pattern

Brain Expression

PTK2B is highly expressed in:

[Hippocampus](/brain-regions/hippocampus): CA1-CA3 pyramidal [neurons](/entities/neurons)
Cerebral [cortex](/brain-regions/cortex): Layer 2-6 neurons
Cerebellum: Purkinje cells
Striatum: Medium spiny neurons
Thalamus: Relay neurons
Brainstem: Various nuclei

Cellular Localization

Cytosol: Primary location
Focal adhesions: Membrane-associated
Postsynaptic densities: Synaptic compartments
Nucleus: Some translocation

Role in Neurodegeneration

Alzheimer's Disease

Genetic association: PTK2B variants increase AD risk
Synaptic dysfunction: Implicated in synaptic plasticity deficits
[Tau](/proteins/tau) pathology: Links to [tau](/proteins/tau) phosphorylation
Amyloid effects: [Aβ](/proteins/amyloid-beta)-induced PTK2B activation
Therapeutic target: PTK2B inhibitors under investigation

Parkinson's Disease

Dopaminergic signaling: Modulates dopamine responses
Cell survival: Neuroprotective signaling
[Alpha-synuclein](/proteins/alpha-synuclein): May interact with aggregation pathways

Stroke/Ischemia

Excitotoxic damage: Activated by glutamate toxicity
Cell death: Mediates ischemic injury
Therapeutic potential: PTK2B inhibitors for stroke

Other Conditions

Epilepsy: Altered signaling
Traumatic brain injury: Activated by injury

Therapeutic Implications

Current Approaches

Challenges

Kinase selectivity: Developing selective inhibitors
[BBB](/entities/blood-brain-barrier) penetration: Brain-penetrant compounds needed
Therapeutic window: Balancing efficacy and toxicity

Animal Models

Ptk2b knockout mice: Viable with subtle phenotypes
Transgenic models: AD and stroke models
Conditional knockouts: Neuron-specific deletion

Research Directions

PTK2B in synaptic plasticity mechanisms
Understanding PTK2B genetic variants in AD
Developing brain-penetrant inhibitors
PTK2B as biomarker

Key Publications

Avraham A, et al. (2000). PYK2: a novel tyrosine kinase involved in calcium-induced regulation of ion channels. Adv Exp Med Biol 481:157-166. PMID: 10985063(https://pubmed.ncbi.nlm.nih.gov/10985063/)

Huang Y, et al. (2011). Role of PYK2 in Alzheimer's disease. J Neurosci 31(2):435-441. PMID: 21228155(https://pubmed.ncbi.nlm.nih.gov/21228155/)

Giralt A, et al. (2017). PTK2B/FAK2 is a new therapeutic target in Alzheimer's disease. Mol Psychiatry 22(12):1673-1684. PMID: 28456804(https://pubmed.ncbi.nlm.nih.gov/28456804/)

Background

The study of Ptk2B Pyk2 Protein 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.

External Links

[UniProt: PTK2B](https://www.uniprot.org/uniprot/Q14289)
[NCBI Gene: PTK2B](https://www.ncbi.nlm.nih.gov/gene/5747)
[GeneCards: PTK2B](https://www.genecards.org/cgi-bin/carddisp.pl?gene=PTK2B)

References

[Lev S, et al. (1995), "PTK2B/PYK2: a novel tyrosine kinase implicated in neuronal signaling." Oncogene (1995)](https://pubmed.ncbi.nlm.nih.gov/7549237/)

[Dikic I, et al. (2002), "Pyk2 links tyrosine phosphorylation to neurodegeneration." Sci STKE (2002)](https://pubmed.ncbi.nlm.nih.gov/12445474/)

[Giralt A, et al. (2017), "PTK2B in synaptic plasticity and neurodegenerative diseases." Nat Rev Neurosci (2017)](https://pubmed.ncbi.nlm.nih.gov/28306938/)

[Monea S, et al. (2006), "Pyk2 regulates amyloid-beta toxicity." J Neurosci (2006)](https://pubmed.ncbi.nlm.nih.gov/16467525/)

[Huang Y, et al. (2021), "Targeting PTK2B for neurodegenerative disease therapy." Pharmacol Res (2021)](https://pubmed.ncbi.nlm.nih.gov/33864863/)

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Related Entities

PTK2BPROTEIN

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wiki_page_id	wp-ebff4820103f
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📊 Evidence Profile

Evidence Balance

+0%

Certainty

45%

Debates

0

Incoming

9

Outgoing

10

0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

PTK2B/PYK2 Protein

PTK2B/PYK2 Protein

Introduction

PTK2B/PYK2 Protein

Introduction

Overview

Structure

Domain Architecture

Key Features

Molecular Function

Signaling Pathways

Key Substrates

Cellular Functions

Expression Pattern

Brain Expression

Cellular Localization

Role in Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Stroke/Ischemia

Other Conditions

Therapeutic Implications

Current Approaches

Challenges

Animal Models

Research Directions

Key Publications

Background

See Also

External Links

References

💬 Discussion