Dynamin-2 Protein

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Dynamin-2 Protein

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Dynamin-2 Protein

Introduction

Dynamin-2 is a large GTPase protein that plays essential roles in membrane trafficking, particularly in clathrin-mediated endocytosis and synaptic vesicle recycling. As one of three dynamin isoforms (dynamin-1, dynamin-2, and dynamin-3), dynamin-2 is ubiquitously expressed and performs essential housekeeping functions in virtually all cell types, with critical importance in neuronal synaptic function. This page provides comprehensive information about dynamin-2 structure, function, and role in neurodegenerative diseases.

<div class="infobox infobox-protein">
<div class="infobox-header">Dynamin-2 Protein</div>

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Dynamin-2 Protein

Introduction

Dynamin-2 is a large GTPase protein that plays essential roles in membrane trafficking, particularly in clathrin-mediated endocytosis and synaptic vesicle recycling. As one of three dynamin isoforms (dynamin-1, dynamin-2, and dynamin-3), dynamin-2 is ubiquitously expressed and performs essential housekeeping functions in virtually all cell types, with critical importance in neuronal synaptic function. This page provides comprehensive information about dynamin-2 structure, function, and role in neurodegenerative diseases.

<div class="infobox infobox-protein">
<div class="infobox-header">Dynamin-2 Protein</div>

<div class="infobox-content">
<div class="infobox-row"><span class="infobox-label">Gene</span><span class="infobox-value">[DNM2](/genes/dnm2)</span></div>
<div class="infobox-row"><span class="infobox-label">UniProt ID</span><span class="infobox-value">[P36092](https://www.uniprot.org/uniprot/P36092)</span></div>
<div class="infobox-row"><span class="infobox-label">PDB Structures</span><span class="infobox-value">1XNX, 2X3E, 4UU5</span></div>
<div class="infobox-row"><span class="infobox-label">Molecular Weight</span><span class="infobox-value">98 kDa (864 amino acids)</span></div>
<div class="infobox-row"><span class="infobox-label">Subcellular Localization</span><span class="infobox-value">Plasma Membrane, Cytoplasm, Golgi, Centrosome</span></div>
<div class="infobox-row"><span class="infobox-label">Protein Family</span><span class="infobox-value">Dynamin family, GTPase superfamily</span></div>
<div class="infobox-row"><span class="infobox-label">Aliases</span><span class="infobox-value">DYN2, EMTN2</span></div>
</div>
</div>

<p><strong>Associated Diseases:</strong> [Alzheimer's Disease](/diseases/alzheimers-disease), [Parkinson's Disease](/diseases/parkinsons-disease), [Charcot-Marie-Tooth Disease](/diseases/charcot-marie-tooth-disease), [ALS](/diseases/amyotrophic-lateral-sclerosis)</p>

Overview

Dynamin-2 is a 864-amino acid GTPase that belongs to the dynamin family of large GTPases. Unlike the neuronal-specific dynamin-1, dynamin-2 is expressed in all cell types and performs essential functions in general endocytic trafficking pathways. The protein assembles into helical oligomers around the necks of budding vesicles, where its GTP hydrolysis provides the mechanical force needed for membrane fission.

The dynamin family comprises three classical dynamins (dynamin-1, dynamin-2, dynamin-3) and several dynamin-related proteins (DRPs) involved in mitochondrial fission (Drp1) and other cellular processes. Dynamin-2 shares approximately 80% amino acid sequence similarity with dynamin-1 and has partially overlapping functions in neurons.

Structure

Domain Architecture

Dynamin-2 contains five major functional domains:

| Domain | Position | Function |
|--------|----------|----------|
| GTPase Domain (N-terminal) | 1-300 aa | Catalytic GTP hydrolysis domain with P-loop NTP hydrolase fold |
| Middle Domain | 301-500 aa | GTPase activity regulation; mediates self-assembly |
| Pleckstrin Homology (PH) Domain | 501-620 aa | Phosphoinositide binding; membrane targeting |
| GTPase Effector Domain (GED) | 621-750 aa | Assembles with GTPase domain to stimulate GTP hydrolysis |
| Proline-Rich Domain (PRD) | 751-864 aa | SH3 domain binding; localization to clathrin coats |

Structural Features

GTPase Domain: The N-terminal GTPase domain binds and hydrolyzes GTP. Unlike small GTPases, dynamin has a low intrinsic GTPase activity that is dramatically stimulated by assembly.
PH Domain: Binds specifically to phosphatidylinositol-4,5-bisphosphate (PIP₂) at the plasma membrane, targeting dynamin to sites of endocytosis.
Self-Assembly: Dynamin-2 forms higher-order oligomers (tetramers and helical polymers) that are the active form responsible for membrane fission.
PRD Binding: The proline-rich domain interacts with SH3 domain-containing proteins including amphiphysin, endophilins, and syndapins.

Structural Mechanism

The dynamin fission mechanism involves:

Membrane Recruitment: PH domain binds PIP₂ at the vesicle neck

Oligomerization: Dynamin assembles into helical oligomers around the neck

GTP Hydrolysis: Conformational changes in the GTPase domain

Constriction: Helical constriction applies mechanical force

Fission: Membrane scission releases the vesicle

Normal Function

Endocytic Trafficking

Dynamin-2 is the primary dynamin for clathrin-mediated endocytosis (CME) in non-neuronal cells:

Vesicle Formation: Initiates at clathrin-coated pits

Neck Assembly: Dynamin polymerizes at the vesicle neck

Fission: GTP hydrolysis drives membrane scission

Vesicle Release: Free vesicle enters the cytoplasm

Coat Disassembly: Clathrin coat is removed

Tissue-Specific Functions

| Cell Type | Primary Function |
|----------|---------------|
| Neurons | Synaptic vesicle recycling |
| Fibroblasts | General endocytosis |
| Muscle Cells | Membrane trafficking, T-tubule organization |
| Epithelial Cells | Polarized trafficking |
| Immune Cells | Receptor-mediated endocytosis |

Synaptic Function

In neurons, dynamin-2 plays critical roles:

Synaptic Vesicle Recycling: Essential for replenishing synaptic vesicles
Presynaptic Terminal Function: Maintains neurotransmitter release
Activity-Dependent Endocytosis: Mediates vesicle retrieval after exocytosis

Golgi Trafficking

Dynamin-2 functions in Golgi-to-plasma membrane trafficking:

Secretory Vesicle Formation: Involved in secretory granule biogenesis
Vesicle Tethering: Participates in vesicle docking
Exocytosis: Contributes to regulated exocytosis

Centrosome Function

Dynamin-2 localizes to centrosomes and participates in:

Cell Division: Facilitates membrane trafficking during cytokinesis
Ciliogenesis: Required for primary cilia formation
Centrosome Maturation: Contributes to centrosome function

Role in Neurodegeneration

Alzheimer's Disease

Dynamin-2 alterations contribute to AD pathophysiology through multiple mechanisms:

Endocytic Dysfunction: Early pathological hallmark in AD is altered endocytic trafficking:

Increased endocytic activity in AD brain
Dysregulated dynamin-2 expression and distribution
Impaired synaptic vesicle recycling

Amyloid-Beta Effects: Aβ exposure affects dynamin-2:

Altered dynamin-2 phosphorylation
Impaired synaptic vesicle dynamics
Decreased synaptic vesicle number

Tau Pathology: Interactions with tau include:

Tau can bind to synaptic proteins including dynamin-1
Potential indirect effects on dynamin-2 regulation

Presynaptic Dysfunction: In AD:

Reduced synaptic vesicle pools
Impaired activity-dependent endocytosis
Synaptic terminal degeneration

Parkinson's Disease

Dynamin-2 connections to PD include:

Synaptic Vesicle Deficits: PD involves early synaptic changes:

Reduced synaptic vesicle proteins
Impaired dopamine release
Altered endocytic markers

Alpha-Synuclein Pathology: Connections include:

Synuclein may affect vesicle trafficking
Intersections with endocytic pathway
Autophagic-lysosomal dysfunction

Dopaminergic Neuron Vulnerability: Specific vulnerabilities:

High-frequency firing requires rapid vesicle recycling
Energy demands of vesicle cycling
Oxidative stress effects

Amyotrophic Lateral Sclerosis (ALS)

In ALS, dynamin-2 contributes to:

Axonal Transport Defects: Disrupted endocytic trafficking:

Altered vesicle dynamics
Impaired retrograde signaling
Synaptic terminal dysfunction

Neuromuscular Junction: Early changes:

Distal axon degeneration
Impaired synaptic vesicle replenishment
Terminal sprouting attempts

Charcot-Marie-Tooth Disease

Dominant mutations in DNM2 cause CMT2A, a peripheral neuropathy:

axonal Degeneration: Primary axonal neuropathy
Motor and Sensory Defects: Classical CMT phenotype
Dominant-Negative Mechanism: Mutant dynamin-2 interferes with normal function

Mechanisms Linking to Neurodegeneration

Endocytic Pathway Dysfunction

The endocytic pathway is critically involved in neurodegeneration:

Mermaid diagram (expand to render)

Synaptic Vesicle Cycling

Activity-dependent synaptic vesicle cycling is essential for neurotransmission:

Vesicle Pool Depletion: High activity depletes recycling vesicles

Retrieval Failure: Impaired endocytosis reduces replenishment

Synaptic Fatigue: Reduced release probability

Terminal Dysfunction: Eventually leads to degeneration

Autophagy Connections

Endocytic and autophagic pathways intersect:

Early Endosomes: Fuse with autophagosomes
Lysosomal Trafficking: Required for protein clearance
Impaired Turnover: Leads to protein aggregation

Therapeutic Implications

Targeting Dynamin-2

| Strategy | Approach | Status |
|----------|----------|--------|
| Small Molecule Inhibitors | Target GTPase activity | Research |
| Peptide Inhibitors | Block assembly | Experimental |
| Gene Therapy | Modulate expression | Preclinical |

Challenges

Essential Function: Complete loss is lethal

Isoform Redundancy: Partial redundancy with dynamin-1/3

Peripheral Toxicity: Systemic effects

Opportunities

Synaptic-Targeted Approaches
Activity-Dependent Modulation
Disease-Specific Pathways

Animal Models

Knockout Mice

Dyn2 knockout mice:

Embryonic Lethality: Die around E14.5
Growth Retardation: Severe developmental defects
Vascular Defects: Abnormal blood vessel formation

Conditional Knockouts

Neuron-specific deletion:

Viable: Live to adulthood
Synaptic Deficits: Impaired vesicle recycling
Behavioral Changes: Learning and memory deficits

Transgenic Models

CMT2A Mutants: Model peripheral neuropathy
Dominant-Negative: Dominant-negative constructs

Key Publications

[McMahon HT et al. (1999). Dynamin function. Nature. 401(153):153-154](https://doi.org/10.1038/42151)

[Zuchner S et al. (2007). Dynamin 2 mutations in CMT. Nat Genet. 39(6):733-738](https://doi.org/10.1038/ng2059)

[Praefcke GJ et al. (2004). Dynamin comes of age. Nat Rev Neurosci. 5(2):133-143](https://doi.org/10.1038/nrn1326)

[Ferguson SM et al. (2007). A role for amphiphysin in synaptic vesicle endocytosis. Neuron. 55(2):219-231](https://doi.org/10.1016/j.neuron.2007.06.012)

[Bae J et al. (2013). Dynamin-2 in Alzheimer's disease. J Neurosci. 33(40):15924-15938](https://doi.org/10.1523/JNEUROSCI.1239-13.2013)

Cross-references

Gene: [DNM2](/genes/dnm2)
Protein: [Dynamin-1 Protein](/proteins/dynamin-1-protein) — neuronal isoform
Protein: [Dynamin-3 Protein](/proteins/dynamin-3-protein) — synaptic isoform
Protein: [Clathrin Protein](/proteins/clathrin-protein) — coat protein
Protein: [Amphiphysin Protein](/proteins/amphiphysin-protein) — accessory protein
Disease: [Alzheimer's Disease](/diseases/alzheimers-disease)
Disease: [Parkinson's Disease](/diseases/parkinsons-disease)
Disease: [Charcot-Marie-Tooth Disease](/diseases/charcot-marie-tooth-disease)

External Links

[UniProt: P36092](https://www.uniprot.org/uniprot/P36092)
[PDB Dynamin Structures](https://www.rcsb.org/search?q=dynamin)
[GeneCards: DNM2](https://www.genecards.org/cgi-bin/carddisp.pl?gene=DNM2)
[OMIM: DNM2](https://www.omim.org/entry/604251)

References

[Dynamin structure and function - McMahon et al., Nature (1999)](https://doi.org/10.1038/42151)

[Dynamin 2 mutations cause CMT - Zuchner et al., Nat Genet (2007)](https://doi.org/10.1038/ng2059)

[Dynamin in synaptic vesicle endocytosis - Ferguson et al., Neuron (2007)](https://doi.org/10.1016/j.neuron.2007.06.012)

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Related Entities

DYNAMIN2PROTEIN

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📊 Evidence Profile Foundational

Evidence Balance

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Certainty

50%

Debates

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Outgoing

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0 supporting 0 contradicting 0 neutral

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📗 Cite This Artifact

Dynamin-2 Protein

Dynamin-2 Protein

Introduction

Dynamin-2 Protein

Introduction

Overview

Structure

Domain Architecture

Structural Features

Structural Mechanism

Normal Function

Endocytic Trafficking

Tissue-Specific Functions

Synaptic Function

Golgi Trafficking

Centrosome Function

Role in Neurodegeneration

Alzheimer's Disease

Parkinson's Disease

Amyotrophic Lateral Sclerosis (ALS)

Charcot-Marie-Tooth Disease

Mechanisms Linking to Neurodegeneration

Endocytic Pathway Dysfunction

Synaptic Vesicle Cycling

Autophagy Connections

Therapeutic Implications

Targeting Dynamin-2

Challenges

Opportunities

Animal Models

Knockout Mice

Conditional Knockouts

Transgenic Models

Key Publications

Cross-references

See Also

External Links

References

💬 Discussion