| TUBA4A — Tubulin Alpha-4A Protein | |
|---|---|
| Protein Name | Tubulin Alpha-4A |
| Gene | TUBA4A |
| UniProt | P68366 |
| PDB Structures | 5JCF, 6I2D |
| Molecular Weight | ~50 kDa |
| Subcellular Localization | Cytoplasm, Axons, Dendrites, Microtubules |
| Protein Family | Alpha-tubulin family |
| Diseases | Amyotrophic Lateral Sclerosis, Primary Lateral Sclerosis |
Tuba4A 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.
TUBA4A (Tubulin Alpha-4A) is a member of the alpha tubulin family that forms heterodimers with beta-tubulin to create microtubules, essential cytoskeletal elements in all eukaryotic cells. In neurons, TUBA4A is particularly important for axonal integrity and function[1].
TUBA4A is a 450-amino acid protein with a conserved tubulin fold characteristic of all alpha-tubulins:
The protein undergoes several post-translational modifications that regulate its function:
In neurons, TUBA4A-containing microtubules serve critical functions:
TUBA4A is highly expressed in motor neurons and cortical neurons, making these cell types particularly vulnerable to TUBA4A mutations[2].
Pathogenic TUBA4A mutations cause autosomal dominant ALS through several mechanisms:
Loss of microtubule stability: Mutations reduce microtubule polymerization efficiency and increase depolymerization rates. This leads to:
Aggregation propensity: Some TUBA4A mutants show increased tendency to form aggregates that sequester other microtubule proteins.
Microtubule-stabilizing approaches are being explored for TUBA4A-related ALS:
| Approach | Example | Status |
|---|---|---|
| Small molecules | EpoD, Taxol derivatives | Preclinical |
| Natural compounds | Epothilone D | Clinical trials |
| Gene therapy | AAV-TUBA4A | Preclinical |
TUBA4A undergoes various post-translational modifications that regulate its function:
The brain expresses multiple tubulin isoforms:
| Isoform | Gene | Neuronal Expression | Specific Functions |
|---|---|---|---|
| TUBA4A | TUBA4A | Ubiquitous | General cytoskeleton |
| TUBA1A | TUBA1A | High in neurons | Axonal transport |
| TUBA1B | TUBA1B | Ubiquitous | Proliferation |
| TUBA3E | TUBA3E | Low in brain | Specialized roles |
TUBA4A contributes to microtubule dynamics:
The study of Tuba4A 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.
Wu CH, Fallini C, Ticozzi N, et al. Mutations in the tubulin alpha-4A subunit gene (TUBA4A) in familial and sporadic amyotrophic lateral sclerosis. Neuron. 2014;81(2):312-319. PMID:24462097 ↩︎
Janke C, Kneussel M. Tubulin post-translational modifications: emerging functions in neuronal trafficking. Neuroscientist. 2010;16(3):266-275. PMID:20236956 ↩︎