Dynamin-1 Protein

Dynamin-1 — DNM1L Protein

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">Dynamin-1 Protein</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>DNM1L</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Dynamin-1</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q05193</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>12p11.21</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>10059</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000087420</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>864 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~96 kDa</td>
</tr>
<tr>
<td class="label">Subcellular Location</td>
<td>Cytosolic, synaptic vesicles, mitochondria</td>
</tr>
</table>

Dynamin-1 (encoded by the DNM1L gene) is a large GTPase protein essential for synaptic vesicle endocytosis and mitochondrial fission. It plays a critical role in maintaining synaptic function and neuronal health, with implications for Alzheimer's disease, Parkinson's disease, and other neurodegenerative disorders.

Overview

Structure

Dynamin-1 has a characteristic multi-domain architecture[@praefcke2004]:

Domains

Dynamin-1 — DNM1L Protein

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">Dynamin-1 Protein</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>DNM1L</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Dynamin-1</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q05193</td>
</tr>
<tr>
<td class="label">Chromosomal Location</td>
<td>12p11.21</td>
</tr>
<tr>
<td class="label">NCBI Gene ID</td>
<td>10059</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000087420</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>864 amino acids</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~96 kDa</td>
</tr>
<tr>
<td class="label">Subcellular Location</td>
<td>Cytosolic, synaptic vesicles, mitochondria</td>
</tr>
</table>

Dynamin-1 (encoded by the DNM1L gene) is a large GTPase protein essential for synaptic vesicle endocytosis and mitochondrial fission. It plays a critical role in maintaining synaptic function and neuronal health, with implications for Alzheimer's disease, Parkinson's disease, and other neurodegenerative disorders.

Overview

Structure

Dynamin-1 has a characteristic multi-domain architecture[@praefcke2004]:

Domains

Assembly

Dynamin-1 forms:

• Tetramers: Basic building blocks
• Helical oligomers: 30-50 dynamin molecules per ring
• Higher-order structures: Surrounds vesicle necks

Function

Synaptic Vesicle Endocytosis

Dynamin-1 is the master regulator of synaptic vesicle recycling[@cao2017]:

The Endocytic Cycle

Regulation

Dynamin-1 activity is tightly regulated by:

• Phosphorylation: Dephosphorylation triggers endocytosis during neuronal activity
• Calcium/calmodulin: Calcium influx activates dynamin-1
• Lipid composition: PIP₂ levels affect membrane recruitment
• Protein interactions: Endophilins, amphiphysins, and synaptojanins

Mitochondrial Dynamics

Dynamin-1 also participates in mitochondrial fission[@fonseka2014]:

• Outer membrane constriction: Works with [Drp1](/proteins/drp1-protein) for mitochondrial division
• Quality control: Removes damaged mitochondrial portions
• [Apoptosis](/entities/apoptosis): Facilitates mitochondrial fragmentation in cell death

Other Cellular Functions

• Clathrin-independent endocytosis: Some cargo uses dynamin-1 pathways
• [Autophagy](/entities/autophagy): Involved in autophagosome formation
• Plasma membrane repair: Patch formation after injury

Disease Associations

Alzheimer's Disease

Dynamin-1 is significantly implicated in AD pathogenesis[@xu2019]:

Synaptic Dysfunction

• [Amyloid-beta](/proteins/amyloid-beta) interaction: Aβ oligomers impair dynamin-1 function
• Endocytic deficits: Reduced synaptic vesicle recycling
• Synaptic loss: Correlates with cognitive decline

Therapeutic Implications

• Dynamin-1 enhancers: Potential cognitive enhancement
• Endocytic pathway modulation: Disease-modifying strategies

Parkinson's Disease

In PD, dynamin-1 alterations affect dopaminergic transmission[@ferguson2012]:

• Synaptic vesicle pools: Depleted in vulnerable [neurons](/entities/neurons)
• [Alpha-synuclein](/proteins/alpha-synuclein) interaction: May affect endocytic trafficking
• Mitochondrial dysfunction: Contributes to neuronal death

Amyotrophic Lateral Sclerosis (ALS)

• Axonal transport defects: Disrupted endocytosis in motor neurons
• Mitochondrial pathology: Altered fission/fusion dynamics
• Synaptic dysfunction: Contributes to neuromuscular denervation

Epilepsy

• Synaptic vesicle depletion: Altered seizure thresholds
• Excitotoxicity: Dysregulated calcium-dependent release

Expression

Brain Regions

Dynamin-1 is highly expressed in:

• Cerebral [cortex](/brain-regions/cortex) — Pyramidal neurons, all layers
• [Hippocampus](/brain-regions/hippocampus) — CA1-CA3 pyramidal cells, dentate gyrus granule cells
• Cerebellum — Purkinje cells
• Striatum — Medium spiny neurons
• Substantia nigra — Dopaminergic neurons

Cellular Distribution

• Presynaptic terminals: Highest concentration
• Soma: Moderate expression
• Dendrites: Synaptic domains
• Axon initial segment: Specialized endocytic zones

Therapeutic Implications

Current Strategies

• Small molecule modulators: Targeting dynamin GTPase activity
• Gene therapy: Viral delivery of dynamin-1
• Symptomatic treatments: Enhancing synaptic function

Research Directions

• [Blood-brain barrier](/entities/blood-brain-barrier): CNS delivery challenges
• Selectivity: Targeting specific dynamin isoforms
• Combination therapy: With other synaptic proteins

Cross-References

• [Synaptic Vesicle Cycling](/mechanisms/synaptic-vesicle-cycling) — Overview of vesicle endocytosis
• [Mitochondrial Dynamics](/mechanisms/mitochondrial-dysfunction-neurodegeneration) — Mitochondrial fission
• [Alzheimer's Disease](/diseases/alzheimers-disease) — AD and synaptic dysfunction
• [Parkinson's Disease](/diseases/parkinsons-disease) — PD mechanisms
• [DNM1L Gene](/genes/dnm1l) — Gene page

Key Publications

See Also

• [Dynamin Family Overview](/mechanisms/dynamin-family-neurodegeneration) — Related proteins
• [Synaptic Function](/mechanisms/synaptic-function-neurodegeneration) — Synaptic biology
• [Mitochondrial Quality Control](/mechanisms/mitochondrial-quality-control) — Mitochondrial dynamics

External Links

• [NCBI Gene - DNM1L](https://www.ncbi.nlm.nih.gov/gene/10059)
• [UniProt - Dynamin-1](https://www.uniprot.org/uniprot/Q05193)
• [GeneCards - DNM1L](https://www.genecards.org/cgi-bin/carddisp.pl?gene=DNM1L)
• [OMIM - DNM1L](https://www.omim.org/entry/603850)

References