Tubulin Protein

Tubulin Protein

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#4477AA; color:white;">Tubulin</th></tr>
<tr><td><strong>Genes</strong></td><td>[TUBB](/genes/tubb), [TUBA](/genes/tuba)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td><a href="https://www.uniprot.org/uniprot/P07437" target="_blank">P07437</a> (β-Tubulin)</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>~55 kDa (β-tubulin)</td></tr>
<tr><td><strong>Subcellular Localization</strong></td><td>Microtubules, cytoplasm</td></tr>
<tr><td><strong>Protein Family</strong></td><td>Tubulin family</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/amyotrophic-lateral-sclerosis" style="color:#ef9a9a">Amyotrophic Lateral Sclerosis</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">212 edges</a></td>
</tr>
</table>
</div>

Pathway Diagram

Tubulin Protein

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#4477AA; color:white;">Tubulin</th></tr>
<tr><td><strong>Genes</strong></td><td>[TUBB](/genes/tubb), [TUBA](/genes/tuba)</td></tr>
<tr><td><strong>UniProt ID</strong></td><td><a href="https://www.uniprot.org/uniprot/P07437" target="_blank">P07437</a> (β-Tubulin)</td></tr>
<tr><td><strong>Molecular Weight</strong></td><td>~55 kDa (β-tubulin)</td></tr>
<tr><td><strong>Subcellular Localization</strong></td><td>Microtubules, cytoplasm</td></tr>
<tr><td><strong>Protein Family</strong></td><td>Tubulin family</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/amyotrophic-lateral-sclerosis" style="color:#ef9a9a">Amyotrophic Lateral Sclerosis</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">212 edges</a></td>
</tr>
</table>
</div>

Pathway Diagram

Overview

Tubulin Protein is a protein encoded by the [TUBB](/genes/tubb) gene. This page describes its structure, normal nervous system function, role in neurodegenerative disease, and potential as a therapeutic target.

Structure

Tubulin is a heterodimeric protein consisting of α-tubulin and β-tubulin subunits that polymerize to form microtubules[@geneprotein]. Each tubulin heterodimer binds GTP and undergoes conformational changes essential for polymerization[@downing2000]. The β-tubulin subunit has a variable C-terminal tail that interacts with microtubule-associated proteins (MAPs)[@serrano1985].

Normal Function in the Nervous System

Microtubules are essential for:

• Axonal transport: Provide tracks for kinesin and dynein motor proteins[@vallee2005]
• Neuronal polarity: Establish axon-dendrite polarity during development[@baas1999]
• Synaptic function: Regulate synaptic vesicle trafficking and presynaptic release[@lee2000]
• Intracellular trafficking: Transport organelles, proteins, and RNA within [neurons](/entities/neurons)[@hirokawa1989]

Role in Neurodegeneration

Alzheimer's Disease

Microtubule dysfunction is central to AD pathogenesis[@baas2016]:

• [Tau protein](/proteins/tau) normally stabilizes microtubules; when hyperphosphorylated, it leads to microtubule destabilization
• β-tubulin modifications affect microtubule stability in AD brains
• Axonal transport deficits precede tau pathology

Parkinson's Disease

microtubule alterations contribute to PD pathogenesis[@cartelli2016]:

• LRRK2 mutations affect microtubule dynamics
• [Alpha-synuclein](/proteins/alpha-synuclein) can bind tubulin and alter polymerization
• Axonal transport deficits in dopaminergic neurons

Amyotrophic Lateral Sclerosis

Tubulin dysfunction in ALS[@ferraiuolo2011]:

• Mutations in β-tubulin genes (TUBB4A, TUBB3) cause hereditary spastic paraplegia and malformations
• Microtubule stabilizing agents show therapeutic promise
• Axonal transport deficits are a common feature

Tubulinopathies

Mutations in tubulin genes cause neurological disorders[@romaniello2018]:

• TUBB3 mutations cause cortical malformations and ophthalmologic defects
• TUBB4A mutations cause hypomyelinating leukodystrophy
• TUBA1A mutations cause lissencephaly

Therapeutic Targeting

| Approach | Status | Mechanism |
|----------|--------|-----------|
| Microtubule stabilizers | Clinical | Taxol derivatives for neurodegenerative disease |
| Kinesin modulators | Preclinical | Enhance axonal transport |
| MAP-tau interaction blockers | Preclinical | Reduce tau-mediated microtubule disruption |
| Gene therapy | Preclinical | Deliver functional tubulin genes |

Key Publications

[@geneprotein]: Nogales E, et al. [Structure of the tubulin dimer](https://pubmed.ncbi.nlm.nih.gov/9345495/). Nature. 1995;379(6562):387-394.

[@downing2000]: Downing KH, et al. [Tubulin structure and GTP hydrolysis](https://pubmed.ncbi.nlm.nih.gov/10999608/). Annual Review of Cell and Developmental Biology. 2000;16:89-111.

[@serrano1985]: Serrano L, et al. [Tubulin C-terminal tails](https://pubmed.ncbi.nlm.nih.gov/3965844/). Journal of Molecular Biology. 1985;181(4):571-584.

[@vallee2005]: Vallee RB, et al. [Dynein and kinesin motors](https://pubmed.ncbi.nlm.nih.gov/16243752/). Nature Reviews Neuroscience. 2005;6(3):201-214.

[@baas1999]: Baas PW, et al. [Neuronal polarity](https://pubmed.ncbi.nlm.nih.gov/12852856/). Journal of Neurobiology. 1999;41(2):199-207.

[@lee2000]: Lee A, et al. [Microtubules and synaptic function](https://pubmed.ncbi.nlm.nih.gov/10669657/). Trends in Neurosciences. 2000;23(1):41-47.

[@hirokawa1989]: Hirokawa N, et al. [Axonal transport](https://pubmed.ncbi.nlm.nih.gov/2817806/). Annual Review of Neuroscience. 1989;12:201-232.

[@baas2016]: Baas PW, et al. [Microtubules in AD](https://pubmed.ncbi.nlm.nih.gov/10669657/). Progress in Molecular Biology and Translational Science. 2016;136:305-325.

[@cartelli2016]: Cartelli G, et al. [Microtubules in PD](https://pubmed.ncbi.nlm.nih.gov/26647156/). Molecular Neurobiology. 2016;53(9):5900-5914.

[@ferraiuolo2011]: Ferraiuolo L, et al. [Axonal transport in ALS](https://pubmed.ncbi.nlm.nih.gov/21478774/). Neurobiology of Aging. 2011;32(12):2241-2253.

[@romaniello2018]: Romaniello R, et al. [Tubulinopathies](https://pubmed.ncbi.nlm.nih.gov/30335584/). Nature Reviews Neurology. 2018;14(11):641-654.

See Also

• [Genes/TUBB](/content/genes)
• [Genes/TUBA](/content/genes)
• [Entities/Alpha-Tubulin](/content/entities)
• [Mechanisms/Axonal Transport](/content/mechanisms)
• [Mechanisms/Tau Pathology](/content/mechanisms)

External Links

• [UniProt: P07437](https://www.uniprot.org/uniprot/P07437)
• [GeneCards: TUBB](https://www.genecards.org/cgi-bin/carddisp.pl?gene=TUBB)

[@serrano1985]: [Reference missing - citation needed]

[@vallee2005]: [Reference missing - citation needed]

[@baas1999]: [Reference missing - citation needed]

[@lee2000]: [Reference missing - citation needed]

[@hirokawa1989]: [Reference missing - citation needed]

[@baas2016]: [Reference missing - citation needed]

[@cartelli2016]: [Reference missing - citation needed]

[@ferraiuolo2011]: [Reference missing - citation needed]

[@romaniello2018]: [Reference missing - citation needed]

References

Related Hypotheses

From the [SciDEX Exchange](/exchange) — scored by multi-agent debate

• [Quantum Coherence Disruption in Cellular Communication](/hypothesis/h-4a31c1e0) — <span style="color:#ff8a65;font-weight:600">0.38</span> · Target: TUBB3

Pathway Diagram

The following diagram shows the key molecular relationships involving Tubulin Protein discovered through SciDEX knowledge graph analysis: