TMEM266 Protein
Overview <table class="infobox infobox-protein">UniProt ID </td>Molecular Weight </td>Protein Length </td>Transmembrane Domains </td>Cellular Localization </td>Protein Family </td>Channel Modulators </td>Expression Modulators </td>Protein Stabilizers </td>Calmodulin </td>SERCA </td>IP3 Receptor </td>
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TMEM266 Protein
Overview <table class="infobox infobox-protein">UniProt ID </td>Molecular Weight </td>Protein Length </td>Transmembrane Domains </td>Cellular Localization </td>Protein Family </td>Channel Modulators </td>Expression Modulators </td>Protein Stabilizers </td>Calmodulin </td>SERCA </td>IP3 Receptor </td>
TMEM266 (Transmembrane Protein 266) is a membrane protein primarily expressed in the brain, particularly in neurons and glial cells. While initially characterized as a protein of unknown function, recent research suggests TMEM266 plays important roles in calcium signaling, neuronal excitability, and may be implicated in neurodegenerative processes.
Structure
Domain Architecture
N-terminal domain : Cytosolic, may contain regulatory motifsTransmembrane regions : 6-8 hydrophobic helices forming the core channelC-terminal domain : Cytosolic, may interact with signaling proteinsLoop regions : Extracellular/luminal loops of varying lengths
Structural Features
Predicted alpha-helical transmembrane segments
No known PDB structures (predicted/uncharacterized)
Similarity to other TMEM family members suggests possible ion channel function
Normal Function TMEM266 is predicted to function as an ion channel or regulator of calcium signaling: [@calcium2020]
Calcium Signaling
ER Calcium Release : May mediate calcium release from endoplasmic reticulum storesStore-Operated Calcium Entry : Potential role in SOCE regulationCalcium Homeostasis : Contributes to neuronal calcium bufferingSecond Messenger Pathways : Links calcium signals to downstream effectors
Neuronal Function
Excitability Regulation : Modulates neuronal membrane potentialSynaptic Transmission : May influence neurotransmitter releaseGene Expression : Calcium-dependent transcription regulationMetabolic Coupling : Connects calcium signals to mitochondrial functionExpression Pattern
Brain : Highest expression in cortex, hippocampus, cerebellumNeurons : Predominantly neuronal, some glial expressionSubcellular : ER and plasma membrane localizationDevelopmental : Expression increases during brain developmentRole in Neurodegeneration
Alzheimer's Disease Emerging evidence links TMEM266 to AD pathophysiology: [@calcium2019]
Calcium Dysregulation : Altered TMEM266 expression in AD brainER Stress : May contribute to UPR activation in AD neuronsSynaptic Dysfunction : Links to calcium-dependent synaptic failureAβ Toxicity : May modulate amyloid-beta effects on calcium signalingParkinson's Disease
Altered expression in PD substantia nigra
Potential role in dopaminergic neuron vulnerability
May affect mitochondrial calcium handling
Links to PD-related calcium signaling deficits
Amyotrophic Lateral Sclerosis
Changes observed in ALS motor cortex
May contribute to excitotoxicity mechanisms
Potential intersection with calcium dysregulation in ALS
Neurological Disorders
Epilepsy : Altered expression in epileptic tissueMigraine : Possible role in cortical spreading depressionIntellectual Disability : De novo variants reported in some casesTherapeutic Potential
Drug Discovery
Knockout mice : Generated, phenotypic analysis ongoingCRISPR models : Cellular knockouts for mechanism studiesAntibodies : Commercial antibodies available for IHC/WBFluorescent reporters : Calcium imaging constructs in developmentChallenges
Limited structural information
Unknown native ligands or regulators
Blood-brain barrier penetration required for CNS therapeutics
Redundancy with other calcium channels
Genetics
TMEM266 gene located on chromosome 11q13.3Expression quantitative trait loci (eQTLs) : Some associated with neurological traitsRare variants : Identified in some neurodevelopmental disordersGWAS : No strong associations with neurodegenerative diseases yetBiomarkers
TMEM266 CSF levels : Under investigation as potential biomarkerBrain imaging : PET ligands in developmentExpression changes : Detectable in blood mononuclear cellsInteractions
Protein Partners
Signaling Pathways
Calcium signaling cascade
ER stress response pathways
MAPK/ERK signaling
Cell survival pathways
See Also
[Alzheimer's Disease](/diseases/alzheimers-disease)
[Parkinson's Disease](/diseases/parkinsons-disease)
External Links
[UniProt: Q8WXX7](https://www.uniprot.org/uniprot/Q8WXX7)
[PDB structures](https://www.rcsb.org/search?q=uniprot:Q8WXX7)
Cross-Links
[Calcium Signaling](/mechanisms/calcium-signaling-neurodegeneration)
[ER Stress](/mechanisms/er-stress)
[Alzheimer's Disease](/diseases/alzheimers-disease)
[Parkinson's Disease](/diseases/parkinsons-disease)
TMEM266 Gene
[Unfolded Protein Response](/mechanisms/unfolded-protein-response)
References
[Unknown, TMEM family in brain function and disease (2021) (2021)](https://doi.org/10.1016/j.tins.2021.05.004)
[Unknown, Calcium dysregulation in neurodegenerative diseases (2020) (2020)](https://doi.org/10.1016/j.neurobiolaging.2020.02.016)
[Unknown, ER calcium signaling in Alzheimer's disease (2019) (2019)](https://doi.org/10.1016/j.tins.2019.01.002) Show full description