NEK7 Protein

NEK7 Protein

Overview

NEK7 protein (NIMA-related kinase 7) is a 34 kDa serine/threonine kinase encoded by the [NEK7](/genes/nek7) gene. NEK7 is the essential structural mediator of [NLRP3](/proteins/nlrp3-protein) inflammasome assembly, directly bridging NLRP3 protomers to enable oligomerization. In the brain, NEK7-dependent inflammasome activation in [microglia](/cell-types/microglia) is a major driver of neuroinflammatory damage in [Alzheimer's disease](/diseases/alzheimers-disease) and [Parkinson's disease](/diseases/parkinsons-disease).

NEK7 Protein

Overview

NEK7 protein (NIMA-related kinase 7) is a 34 kDa serine/threonine kinase encoded by the [NEK7](/genes/nek7) gene. NEK7 is the essential structural mediator of [NLRP3](/proteins/nlrp3-protein) inflammasome assembly, directly bridging NLRP3 protomers to enable oligomerization. In the brain, NEK7-dependent inflammasome activation in [microglia](/cell-types/microglia) is a major driver of neuroinflammatory damage in [Alzheimer's disease](/diseases/alzheimers-disease) and [Parkinson's disease](/diseases/parkinsons-disease).

<div class="infobox infobox-protein"> [@sharif2019]
<div class="infobox-header">NEK7 Protein</div> [@shi2016]
<table> [@heneka2013]
<tr><td class="infobox-label">Protein Name</td><td>Serine/threonine-protein kinase NEK7</td></tr> [@gordon2018]
<tr><td class="infobox-label">Gene</td><td>[NEK7](/genes/nek7)</td></tr> [@ising2019]
<tr><td class="infobox-label">UniProt ID</td><td>[Q8TDX2](https://www.uniprot.org/uniprot/Q8TDX2)</td></tr> [@schmidburgk2016]
<tr><td class="infobox-label">PDB IDs</td><td>[6NPY](https://www.rcsb.org/structure/6NPY), [2WQM](https://www.rcsb.org/structure/2WQM)</td></tr>
<tr><td class="infobox-label">Molecular Weight</td><td>34.5 kDa</td></tr>
<tr><td class="infobox-label">Subcellular Localization</td><td>Cytoplasm, centrosome</td></tr>
<tr><td class="infobox-label">Protein Family</td><td>NEK (NIMA-related kinase) family</td></tr>
<tr><td class="infobox-label">Associated Diseases</td><td>[Alzheimer's disease](/diseases/alzheimers-disease), [Parkinson's disease](/diseases/parkinsons-disease), [ALS](/diseases/amyotrophic-lateral-sclerosis)</td></tr>
</table>
</div>

Structure

Domain Architecture

• N-terminal extension (residues 1-20): Unstructured region that contributes to protein-protein interactions
• Kinase domain (residues 21-302): Bilobal kinase fold with a canonical ATP-binding pocket; the C-lobe mediates the critical interaction with [NLRP3](/proteins/nlrp3-protein)
• Activation segment: Contains the conserved DFG motif and T-loop with Thr187 as the activating phosphorylation site

NLRP3 Binding Interface

• C-lobe of NEK7: Arg121, Glu122, Leu160, and Arg163 form hydrogen bonds with NLRP3 LRR
• Back of the kinase domain: Additional contacts with the NLRP3 NACHT domain enable bridging between adjacent NLRP3 protomers
• The binding interface buries approximately 2,000 Ų of surface area

Comparison with NEK6

Normal Function

Mitotic Spindle Assembly

• Centrosome separation through phosphorylation of [EG5/KIF11](/genes/kif11)
• Microtubule nucleation at spindle poles
• Cytokinetic abscission

NLRP3 Inflammasome Assembly

Cell Cycle Switch

Role in Disease

Alzheimer's Disease

• [Amyloid-beta](/proteins/amyloid-beta) fibrils phagocytosed by [microglia](/cell-types/microglia-neuroinflammation) cause lysosomal disruption, activating NEK7-NLRP3
• The resulting IL-1β promotes [tau](/proteins/tau) hyperphosphorylation, creating a feed-forward loop between amyloid pathology and tauopathy
• Plaque-associated microglia in AD brains show elevated NEK7 and NLRP3 co-expression
• Conditional deletion of microglial Nek7 in [APP](/entities/app-protein)/PS1 mice reduces plaque burden, [tau](/proteins/tau) phosphorylation, and synaptic loss

Parkinson's Disease

• Extracellular [α-synuclein](/proteins/alpha-synuclein) aggregates trigger potassium efflux in microglia
• Mitochondrial complex I deficiency increases ROS, activating NEK7-NLRP3
• [LRRK2](/proteins/lrrk2-protein) G2019S gain-of-function enhances NLRP3 priming through [NF-κB](/entities/nf-kb)
• [PINK1](/proteins/pink1-protein)/[Parkin](/proteins/parkin-protein) deficiency impairs mitophagy, increasing mitochondrial DAMPs that activate NEK7-NLRP3

Amyotrophic Lateral Sclerosis

Traumatic Brain Injury and Stroke

Therapeutic Targeting

Direct NEK7 Inhibition

• Protein-protein interaction (PPI) disruptors: Small molecules targeting the NEK7-NLRP3 interface could selectively block inflammasome assembly without affecting NEK7 mitotic functions
• Stapled peptides: Designed to mimic the NEK7 C-lobe surface and competitively inhibit NLRP3 binding
• Allosteric modulators: Compounds that shift NEK7 conformation to disfavor NLRP3 interaction

Downstream NLRP3 Inhibitors

• MCC950 (CRID3) blocks NLRP3 ATPase activity downstream of NEK7 and has shown efficacy in AD and PD models
• Dapansutrile (OLT1177) is in clinical trials for inflammatory conditions
• CY-09 and Tranilast represent additional NLRP3-targeting scaffolds

Genetic Approaches

• NEK7-targeting antisense oligonucleotides (ASOs) reduce inflammasome activation in rodent models of neurodegeneration
• CRISPR-mediated NEK7 disruption in iPSC-derived microglia validates the target for human disease

See Also

• [NEK7 Gene](/genes/nek7)
• [NLRP3](/genes/nlrp3) — inflammasome sensor
• [Caspase-1](/proteins/caspase-1-protein) — downstream effector
• [Neuroinflammation Pathway](/mechanisms/neuroinflammation-pathway)
• [Microglial Activation](/mechanisms/microglial-phagocytosis)

External Links

• [UniProt: Q8TDX2](https://www.uniprot.org/uniprot/Q8TDX2)
• [PDB: 6NPY — NEK7-NLRP3 complex](https://www.rcsb.org/structure/6NPY)
• [InterPro: NEK7](https://www.ebi.ac.uk/interpro/entry/InterPro/IPR028374/)
• [GeneCards: NEK7](https://www.genecards.org/cgi-bin/carddisp.pl?gene=NEK7)

References