| Gene Symbol | TAX1BP1 |
|---|---|
| Full Name | Tax1 Binding Protein 1 |
| Chromosome | 7p15.2 |
| NCBI Gene ID | [23177](https://www.ncbi.nlm.nih.gov/gene/23177) |
| OMIM | [605064](https://www.omim.org/entry/605064) |
| Ensembl ID | [ENSG00000133107](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000133107) |
| UniProt ID | [Q86T60](https://www.uniprot.org/uniprot/Q86T60) |
| Protein Class | Ubiquitin-binding protein, autophagy receptor |
| Protein Size | 789 amino acids (~90 kDa) |
| Associated Diseases | [Parkinson's Disease](/diseases/parkinsons-disease), [Alzheimer's Disease](/diseases/alzheimers-disease), ALS, FTD |
| Expression | Brain (neurons, microglia), immune cells, heart |
TAX1BP1 (Tax1 Binding Protein 1) is a ubiquitin-binding protein that plays critical roles in selective autophagy, NF-κB signaling, and innate immune responses. The gene encodes a 789 amino acid protein that serves as an autophagy receptor for damaged mitochondria and intracellular pathogens. TAX1BP1 is located on chromosome 7p15.2 and is expressed in various tissues with particularly high expression in immune cells and the brain. The protein contains multiple functional domains enabling its roles in ubiquitin recognition and autophagy regulation [1].
TAX1BP1 was originally identified as a binding partner of the HTLV-1 Tax oncoprotein, hence its name (Tax1 Binding Protein 1). Subsequent research revealed its broader functions in cellular homeostasis and innate immunity. The protein is now recognized as a key player in selective autophagy—a process by which specific cellular components are targeted for degradation—and in modulating inflammatory signaling pathways.
The importance of TAX1BP1 in neurodegenerative diseases has become increasingly apparent. Loss-of-function studies demonstrate that TAX1BP1 is essential for mitophagy (selective degradation of damaged mitochondria) in dopaminergic neurons, making it particularly relevant to Parkinson's disease pathogenesis. Additionally, its role in clearing protein aggregates links it to multiple neurodegenerative proteinopathies.
The TAX1BP1 gene spans approximately 30 kb and includes:
TAX1BP1 produces multiple mRNA isoforms:
TAX1BP1 contains several functional domains:
TAX1BP1 functions as a selective autophagy receptor:
TAX1BP1 regulates inflammatory responses:
TAX1BP1 is involved in antiviral immunity:
TAX1BP1 exhibits tissue-specific expression:
High expression in:
Cellular localization:
Brain regions with high expression:
TAX1BP1 plays a critical role in PD pathogenesis through its essential function in mitophagy in dopaminergic neurons [2][3]:
Research in patient-derived neurons and animal models shows that TAX1BP1 deficiency exacerbates mitochondrial dysfunction and dopaminergic neuron loss, while overexpression provides protection against mitochondrial toxins.
TAX1BP1 contributes to AD through multiple mechanisms [4][5]:
The protein's ability to target ubiquitinated cargo for autophagic degradation is particularly relevant given the role of protein aggregation in AD pathogenesis.
TAX1BP1 is implicated in ALS and frontotemporal dementia [6]:
TAX1BP1 regulates inflammatory responses in the brain through NF-κB signaling [murphy2018][7][8]:
TAX1BP1 is a promising therapeutic target for neurodegenerative diseases. Several approaches are under investigation to modulate its function and enhance its protective effects [9].
Mouse models have been informative for understanding TAX1BP1 function [6:1]:
Fu T et al. TAX1BP1 and neurodegenerative diseases. Cell Mol Neurobiol. 2021. ↩︎
Liu K et al. TAX1BP1 in Parkinson's disease models. J Parkinsons Dis. 2022. ↩︎
Jain M et al. TAX1BP1 and mitophagy in dopaminergic neurons. J Neurosci. 2019. ↩︎
Song Z et al. TAX1BP1 in amyloid-beta clearance. Mol Neurodegener. 2021. ↩︎
Zhang Y et al. TAX1BP1 and protein aggregate clearance. Cell Death Differ. 2020. ↩︎
Kim C et al. TAX1BP1 mutations cause neurodegenerative disease. Nat Genet. 2019. ↩︎ ↩︎
Iha H et al. Inflammatory responses by TAX1BP1. Nat Rev Immunol. 2018. ↩︎
Wang L et al. TAX1BP1 and the innate immune response in the brain. J Neuroinflammation. 2022. ↩︎
Yang Q et al. Therapeutic targeting of TAX1BP1 in neurodegeneration. Nat Rev Drug Discov. 2023. ↩︎