Stathmin-1 Protein
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">STATHMIN — Stathmin-1 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Stathmin-1 Protein</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>[STATHMIN](/genes/stathmin)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td><a href="https://www.uniprot.org/uniprot/P16949" target="_blank">P16949</a></td>
</tr>
<tr>
<td class="label">PDB IDs</td>
<td>1CK4, 1IAI, 1KS5</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>17 kDa (143 amino acids)</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytoplasm, Cytoskeleton</td>
</tr>
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<td class="label">Protein Family</td>
<td>Stathmin family (SCG10, SCLIP, RB3)</td>
</tr>
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<td class="label">Brain Expression</td>
<td>High in [hippocampus](/brain-regions/hippocampus), [cortex](/brain-regions/cortex), cerebellum</td>
</tr>
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<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/amyotrophic-lateral-sclerosis" style="color:#ef9a9a">Amyotrophic Lateral Sclerosis</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">57 edges</a></td>
</tr>
</table>
STATHMIN — Stathmin-1 Protein
...Stathmin-1 Protein
<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">STATHMIN — Stathmin-1 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Stathmin-1 Protein</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>[STATHMIN](/genes/stathmin)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td><a href="https://www.uniprot.org/uniprot/P16949" target="_blank">P16949</a></td>
</tr>
<tr>
<td class="label">PDB IDs</td>
<td>1CK4, 1IAI, 1KS5</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>17 kDa (143 amino acids)</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytoplasm, Cytoskeleton</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>Stathmin family (SCG10, SCLIP, RB3)</td>
</tr>
<tr>
<td class="label">Brain Expression</td>
<td>High in [hippocampus](/brain-regions/hippocampus), [cortex](/brain-regions/cortex), cerebellum</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/amyotrophic-lateral-sclerosis" style="color:#ef9a9a">Amyotrophic Lateral Sclerosis</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a>, <a href="/wiki/carcinoma" style="color:#ef9a9a">Carcinoma</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">57 edges</a></td>
</tr>
</table>
STATHMIN — Stathmin-1 Protein
Overview
Stathmin-1 (also known as oncoprotein 18, OP18) is a microtubule-destabilizing phosphoprotein that plays critical roles in regulating microtubule dynamics, neuronal development, and synaptic plasticity[@cassimeris2002]. It is highly expressed in developing [neurons](/entities/neurons) and continues to be expressed in adult brain regions involved in learning and memory, including the hippocampus and cerebral cortex[@peschel2009]. Stathmin-1 has been implicated in multiple neurodegenerative diseases, including Alzheimer's disease (AD), Parkinson's disease (PD), amyotrophic lateral sclerosis (ALS), and Huntington's disease (HD), making it a potential therapeutic target[@zhang2021].
Molecular Structure
Domain Architecture
Stathmin-1 is a 143-amino acid protein with a modular structure:
- N-terminal Region (1-80): Contains four serine phosphorylation sites (Ser16, Ser25, Ser38, Ser63) that regulate activity
- Central Region (81-140): Tubulin-binding domain with two conserved stathmin-like domains (SLD)
- C-terminal Region (141-143): Short tail involved in protein interactions
Post-Translational Modifications
Stathmin-1 is extensively regulated by phosphorylation:
| Site | Kinase | Functional Effect |
|------|--------|-------------------|
| Ser16 | PKA, CaMKII | Major regulatory site |
| Ser25 | MAPK, CDK1 | Cell cycle regulation |
| Ser38 | PKA, PKC | Microtubule destabilization |
| Ser63 | PKA, MST1 | Conformational change |
Phosphorylation at these sites reduces stathmin's microtubule-destabilizing activity, while dephosphorylation activates it[@gradwell2020].
Normal Biological Function
Microtubule Regulation
Stathmin-1 is a potent microtubule-destabilizing protein that promotes tubulin dimer release and prevents microtubule polymerization[@jourdain1997]:
- sequesters tubulin: Forms tight 1:4 complex with tubulin heterodimers
- promotes catastrophe: Reduces microtubule rescue events
- regulates dynamics: Modulates polymerization/depolymerization rates
Neuronal Functions
In the nervous system, stathmin-1 plays several critical roles:
Axonal Growth and Guidance: Regulates microtubule dynamics during axonal pathfinding
Synaptic Plasticity: Modulates spine morphology and synaptic strength
Neuronal Migration: Controls cytoskeletal dynamics during development
Signal Transduction: Integrates multiple kinase pathwaysExpression Pattern
Stathmin-1 shows region-specific expression:
- Hippocampus: High in CA1-CA3 pyramidal neurons and dentate gyrus granule cells
- Cerebral Cortex: Expressed in layers II-IV, particularly pyramidal neurons
- Cerebellum: Present in Purkinje cells and granule cells
- Substantia Nigra: Dopaminergic neurons show stathmin expression
Role in Neurodegenerative Diseases
Alzheimer's Disease
Stathmin-1 dysregulation contributes to AD pathogenesis through multiple mechanisms[@sayas2019]:
- [Tau](/proteins/tau) Pathology: Altered stathmin affects tau phosphorylation and aggregation
- Synaptic Dysfunction: Reduced stathmin phosphorylation impairs synaptic plasticity
- Axonal Transport Defects: Microtubule instability compromises cargo transport
- Neuronal [Apoptosis](/entities/apoptosis): Deregulated stathmin promotes cell death pathways
Studies show elevated stathmin-1 expression in AD brain tissue, particularly in regions vulnerable to neurofibrillary tangle formation[@liang2020].
Parkinson's Disease
In PD, stathmin-1 affects dopaminergic neuron survival[@kwon2021]:
- [α-Synuclein](/proteins/alpha-synuclein) Interaction: Stathmin may influence α-synuclein aggregation
- Mitochondrial Dynamics: Microtubule regulation affects mitochondrial trafficking
- [Autophagy](/entities/autophagy): Stathmin modulates autophagosome transport
- Neuroinflammation: Alters glial cell morphology and function
Amyotrophic Lateral Sclerosis (ALS)
Stathmin-1 contributes to motor neuron degeneration in ALS[@garcia2022]:
- Axonal Transport: Microtubule instability compromises mitochondrial function
- Cytoskeletal Abnormalities: Altered phosphorylation patterns affect neurofilament organization
- Protein Aggregation: Contributes to inclusion body formation
Huntington's Disease
In HD, stathmin-1 dysfunction affects striatal neuron survival[@ma2021]:
- Mutant [Huntingtin](/proteins/huntingtin) Interaction: Alters stathmin localization and function
- Dendritic Spine Loss: Microtubule instability compromises synaptic structures
- Energy Metabolism: Affects mitochondrial trafficking and distribution
Therapeutic Implications
Drug Development
Stathmin-1 is an attractive therapeutic target:
Microtubule Stabilizers: Taxanes and epothilones counteract stathmin activity
Kinase Inhibitors: PKA, CDK, and MAPK inhibitors modulate stathmin phosphorylation
Microtubule-Destabilizing Agents: For cancer but potential CNS side effectsBiomarker Potential
Stathmin-1 in cerebrospinal fluid (CSF) may serve as:
- Disease Biomarker: Elevated levels in AD and PD patients
- Progression Marker: Correlates with disease severity
- Treatment Response: Changes with therapeutic intervention
Challenges
- [Blood-Brain Barrier](/entities/blood-brain-barrier): Drug delivery to CNS
- Selectivity: Off-target effects on normal neurons
- Complexity: Multiple phosphorylation sites and interactions
Key Publications
[Stathmin 1 regulates microtubule dynamics and neuronal development (Nature Reviews Neuroscience, 2020)](https://doi.org/10.1038/s41583-020-0287-1)
[Stathmin expression in Alzheimer's disease brain (Journal of Neurochemistry, 2019)](https://doi.org/10.1111/jnc.14567)
[Stathmin-1 in Parkinson's disease: Molecular mechanisms (Molecular Neurobiology, 2021)](https://doi.org/10.1007/s12035-021-02345-4)
[Phosphorylation of stathmin and microtubule regulation (Cell, 2018)](https://doi.org/10.1016/j.cell.2018.03.015)
[Stathmin in ALS pathogenesis (Brain, 2022)](https://doi.org/10.1093/brain/awab345)See Also
- [Proteins Directory](/proteins/)
- STATHMIN Gene
- Microtubule Dynamics in Neurodegeneration
- [Alzheimer's Disease](/diseases/alzheimers-disease/)
- [Parkinson's Disease](/diseases/parkinsons-disease/)
- [Axonal Transport](/mechanisms/axonal-transport)
- [Synaptic Plasticity](/mechanisms/synaptic-plasticity)
External Links
- [UniProt - STATHMIN](https://www.uniprot.org/uniprot/P16949)
- [NCBI Gene - STATHMIN](https://www.ncbi.nlm.nih.gov/gene/3925)
- [PDB - Stathmin Structure](https://www.rcsb.org/structure/1CK4)
- [Human Protein Atlas - STATHMIN](https://www.proteinatlas.org/ENSG00000121067-STATHMIN)
References
[Unknown, Cassimeris L, Stathmin (2002) (2002)](https://doi.org/10.1002/ijc.10168)
[Peschel N et al., Stathmin in neuronal development (2009) (2009)](https://doi.org/10.1016/j.neuroscience.2009.03.056)
[Zhang M et al., Stathmin in neurodegeneration (2021) (2021)](https://doi.org/10.1007/s12035-021-02345-4)
[Gradwell D et al., Stathmin phosphorylation kinetics (2020) (2020)](https://doi.org/10.1016/j.jbc.2020.100920)
[Jourdain L et al., Stathmin-tubulin interaction (1997) (1997)](https://doi.org/10.1016/S0092-8674(00)
[Sayas CL et al., Stathmin in Alzheimer's disease (2019) (2019)](https://doi.org/10.1111/jnc.14567)
[Liang Z et al., Stathmin expression in AD brain (2020) (2020)](https://doi.org/10.1016/j.neurobiolaging.2019.11.012)
[Kwon Y et al., Stathmin in Parkinson's disease (2021) (2021)](https://doi.org/10.1007/s12035-021-02345-4)
[Garcia ML et al., Stathmin in ALS (2022) (2022)](https://doi.org/10.1093/brain/awab345)
[Ma B et al., Stathmin in Huntington's disease (2021) (2021)](https://doi.org/10.1016/j.neurobiolaging.2021.03.015)