DAPK1 Protein
Overview
<table class="infobox infobox-protein">
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<th class="infobox-header" colspan="2">DAPK1 Protein</th>
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<td class="label">Symbol</td>
<td><strong>DAPK1</strong></td>
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<td class="label">Full Name</td>
<td>DAPK1</td>
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<td class="label">Type</td>
<td>Protein</td>
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<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/?query=DAPK1" target="_blank">Search UniProt</a></td>
</tr>
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<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/ami" style="color:#ef9a9a">AMI</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a></td>
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<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">128 edges</a></td>
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Death-associated protein kinase 1 (DAPK1) is a calcium/calmodulin-regulated serine-threonine kinase encoded by [DAPK1](/genes/dapk1). It integrates stress signaling, [apoptosis](/entities/apoptosis) programs, and excitotoxic pathways relevant to neurodegeneration.[@bialik2009][@tu2010] DAPK1 activity has been linked to synaptic dysfunction and neuronal loss in [Alzheimer's Disease](/diseases/alzheimers-disease) and ischemic/degenerative contexts through [NMDA receptor](/entities/nmda-receptor) and [tau](/proteins/tau)-related signaling intersections.[@tu2010][@kim2014]
Structure
...DAPK1 Protein
Overview
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">DAPK1 Protein</th>
</tr>
<tr>
<td class="label">Symbol</td>
<td><strong>DAPK1</strong></td>
</tr>
<tr>
<td class="label">Full Name</td>
<td>DAPK1</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=DAPK1" target="_blank">Search UniProt</a></td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/ami" style="color:#ef9a9a">AMI</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">128 edges</a></td>
</tr>
</table>
Death-associated protein kinase 1 (DAPK1) is a calcium/calmodulin-regulated serine-threonine kinase encoded by [DAPK1](/genes/dapk1). It integrates stress signaling, [apoptosis](/entities/apoptosis) programs, and excitotoxic pathways relevant to neurodegeneration.[@bialik2009][@tu2010] DAPK1 activity has been linked to synaptic dysfunction and neuronal loss in [Alzheimer's Disease](/diseases/alzheimers-disease) and ischemic/degenerative contexts through [NMDA receptor](/entities/nmda-receptor) and [tau](/proteins/tau)-related signaling intersections.[@tu2010][@kim2014]
Structure
DAPK1 is a large (~160 kDa) multidomain kinase with a modular architecture that enables context-dependent activation. The N-terminal catalytic domain contains the serine/threonine kinase active site, followed by a calmodulin (CaM) autoregulatory segment that inhibits kinase activity in the absence of calcium/CaM binding.[@bialik2009] Downstream of the CaM domain are eight ankyrin repeats that mediate protein-protein interactions, a P-loop region, and a C-terminal cytoskeletal-binding death domain.[@bialik2009][@singh2020] Autophosphorylation at Ser308 within the CaM regulatory segment serves as a key inhibitory modification — dephosphorylation of this site by [protein phosphatase 2A](/proteins/pp2a-protein) or calcineurin activates the kinase.[@singh2020] The death domain anchors DAPK1 to the actin cytoskeleton and is essential for its pro-apoptotic function, distinguishing it from the shorter family members DAPK2 and DAPK3.[@bialik2009]
Normal Function
Under physiological conditions, DAPK1 participates in multiple cellular processes. It regulates cytoskeletal dynamics through phosphorylation of myosin light chain, contributing to membrane blebbing and cell motility.[@bialik2009] DAPK1 also promotes [autophagy](/entities/autophagy) by phosphorylating beclin-1 at Thr119, disrupting its inhibitory interaction with [Bcl-2](/proteins/bcl2-protein) and thereby activating the class III PI3K complex required for autophagosome formation.[@zalckvar2009] In the immune system, DAPK1 functions as a tumor suppressor by linking cytokine signaling to apoptosis — loss of DAPK1 expression through promoter methylation is common across multiple cancer types.[@bialik2009][@singh2020] In [neurons](/entities/neurons), balanced DAPK1 activity is important for survival-versus-pruning decisions during development, and its expression is tightly regulated to prevent aberrant cell death.[@tu2010]
Role in Neurodegeneration
Excitotoxicity and NMDA Receptor Modulation
DAPK1 directly binds the GluN2B (NR2B) subunit of [NMDA receptors](/entities/nmda-receptor) at residues 1292–1304, phosphorylating Ser1303 to enhance receptor channel conductance and calcium influx.[@tu2010] This interaction amplifies excitotoxic injury — genetic deletion of DAPK1 or disruption of the DAPK1-GluN2B interface protects against ischemic brain damage in mouse stroke models.[@tu2010] In the context of chronic neurodegeneration, sustained DAPK1-mediated potentiation of extrasynaptic NMDA receptors may contribute to the excitotoxic component of [Alzheimer's Disease](/diseases/alzheimers-disease) pathology.[@hardingham2010]
Tau Phosphorylation and Aggregation
DAPK1 promotes [tau hyperphosphorylation](/mechanisms/tau-hyperphosphorylation) through both direct and indirect mechanisms. It activates downstream kinases including [GSK-3β](/proteins/gsk3-beta-protein) and [CDK5](/proteins/cdk5-protein), which phosphorylate [tau](/proteins/tau) at multiple AD-relevant epitopes.[@kim2014] Kim et al. (2014) demonstrated that DAPK1 directly phosphorylates the microtubule-binding repeat domain of tau, promoting its detachment from microtubules and facilitating [neurofibrillary tangle](/mechanisms/tau-aggregation) formation.[@kim2014] DAPK1 expression is elevated in hippocampal neurons of AD patients compared to age-matched controls, correlating with Braak staging of tau pathology.[@kim2014][@kim2016]
Amyloid Processing
DAPK1 modulates [amyloid-beta](/proteins/amyloid-beta) production by phosphorylating the [amyloid precursor protein](/entities/app-protein) (APP) at Thr668 and by regulating the activity of [gamma-secretase](/entities/gamma-secretase) components.[@kim2016] Overexpression of DAPK1 in neuronal cultures increases Aβ42 secretion, while DAPK1 knockdown reduces amyloidogenic processing.[@kim2016] This dual involvement in both tau and amyloid pathways positions DAPK1 at a mechanistic convergence point in AD pathogenesis.
Autophagy Dysregulation
While DAPK1-mediated beclin-1 phosphorylation normally promotes protective autophagy, chronically elevated DAPK1 activity in diseased neurons may contribute to excessive or dysregulated autophagic flux, potentially exacerbating lysosomal dysfunction observed in [Alzheimer's](/diseases/alzheimers-disease) and [Parkinson's Disease](/diseases/parkinsons-disease).[@zalckvar2009][@shi2022]
Therapeutic Targeting
DAPK1 represents a mechanistically compelling but clinically early-stage therapeutic target for neurodegeneration:
- Small-molecule inhibitors: Several DAPK1 kinase domain inhibitors have been developed, including compounds based on the pyridazinone and aminopyridine scaffolds, though none have advanced beyond preclinical testing.[@singh2020][@shi2022]
- Peptide-based disruptors: A membrane-permeable peptide (Tat-NR2BCT) that disrupts the DAPK1-GluN2B interaction has shown neuroprotection in rodent ischemia models without blocking normal NMDA receptor function.[@tu2010]
- Combination strategies: Given DAPK1's position at the intersection of excitotoxicity, tau pathology, and amyloid processing, combination targeting with anti-tau therapeutics or NMDA receptor modulators (e.g., [memantine](/therapeutics/memantine)) may offer synergistic benefit.[@hardingham2010]
- Biomarker considerations: DAPK1 activity is highly context-dependent, varying with calcium signaling state and phosphatase activity, making biomarker-guided patient selection essential for future clinical trials.[@singh2020]
See Also
- [DAPK1](/genes/dapk1)
- [Excitotoxicity](/mechanisms/glutamate-excitotoxicity)
- [Tau Protein](/proteins/tau)
- [Tau Hyperphosphorylation](/mechanisms/tau-hyperphosphorylation)
- [NMDA Receptor](/entities/nmda-receptor)
- [Alzheimer's Disease](/diseases/alzheimers-disease)
- [GSK-3β](/proteins/gsk3-beta-protein)
External Links
- [UniProt: DAPK1 (P53355)](https://www.uniprot.org/uniprot/P53355)
- [GeneCards: DAPK1](https://www.genecards.org/cgi-bin/carddisp.pl?gene=DAPK1)
- [NCBI Gene: DAPK1](https://www.ncbi.nlm.nih.gov/gene/1612)
References
[Bialik S, Kimchi A, The death-associated protein kinases: structure, function, and beyond (2009)](https://pubmed.ncbi.nlm.nih.gov/19027322/)
[Tu W, Xu X, Peng L, et al, DAPK1 interaction with NMDA receptor NR2B subunits mediates brain damage in stroke (2010)](https://pubmed.ncbi.nlm.nih.gov/20647427/)
[Kim BM, You MH, Chen CH, et al, Death-associated protein kinase 1 has a critical role in aberrant tau protein regulation and function (2014)](https://pubmed.ncbi.nlm.nih.gov/22751193/)
[Singh P, Bhatt LK, Death associated protein kinase 1 (DAPK1): a key player in tau hyperphosphorylation and neurodegeneration (2020)](https://pubmed.ncbi.nlm.nih.gov/32425613/)
[Zalckvar E, Berissi H, Mizrachy L, et al, DAP-kinase-mediated phosphorylation on the BH3 domain of beclin 1 promotes dissociation of beclin 1 from Bcl-XL and induction of autophagy (2009)](https://pubmed.ncbi.nlm.nih.gov/19270693/)
[Hardingham GE, Bading H, Synaptic versus extrasynaptic NMDA receptor signalling: implications for neurodegenerative disorders (2010)](https://pubmed.ncbi.nlm.nih.gov/20401166/)
[Kim BM, You MH, Chen CH, et al, DAPK1 is a mediator of the adverse effects of amyloid-beta peptide on tau phosphorylation and toxicity (2016)](https://pubmed.ncbi.nlm.nih.gov/26493375/)
[Shi Y, Bhatt LK, DAPK1 in neurodegeneration: from molecular mechanisms to therapeutic strategies (2022)](https://pubmed.ncbi.nlm.nih.gov/35689752/)