Dynamin-1 — DNM1L Protein <table class="infobox infobox-protein">Gene Symbol </td>Protein Name </td>UniProt ID </td>Chromosomal Location </td>NCBI Gene ID </td>Ensembl ID </td>Protein Length </td>Molecular Weight </td>Subcellular Location </td>
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">Gene Symbol </td>Protein Name </td>UniProt ID </td>Chromosomal Location </td>NCBI Gene ID </td>Ensembl ID </td>Protein Length </td>Molecular Weight </td>Subcellular Location </td>
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
N-terminal GTPase domain (~300 aa): Catalyzes GTP hydrolysisMiddle domain (~300 aa): Mediates self-assemblyGTPase effector domain (GED) (~100 aa): Regulates GTPase activityC-terminal PH domain (~100 aa**: Phospholipid-binding, membrane interactionProline-rich domain (PRD) (~150 aa**: Interactions with SH3 domain proteins
Assembly Dynamin-1 forms:
Tetramers : Basic building blocksHelical oligomers : 30-50 dynamin molecules per ringHigher-order structures : Surrounds vesicle necksFunction
Synaptic Vesicle Endocytosis Dynamin-1 is the master regulator of synaptic vesicle recycling[@cao2017]:
The Endocytic Cycle
Clathrin coat assembly : Clathrin triskelions form a lattice around the vesicleDynamin recruitment : Dynamin-1 localizes to the neck of the nascent vesicleGTP-dependent constriction : GTP hydrolysis drives conformational changesMembrane fission : The vesicle is released into the cytosolCoat disassembly : Clathrin and associated proteins are recycled
Regulation Dynamin-1 activity is tightly regulated by:
Phosphorylation : Dephosphorylation triggers endocytosis during neuronal activityCalcium/calmodulin : Calcium influx activates dynamin-1Lipid composition : PIP₂ levels affect membrane recruitmentProtein interactions : Endophilins, amphiphysins, and synaptojaninsMitochondrial Dynamics Dynamin-1 also participates in mitochondrial fission[@fonseka2014]:
Outer membrane constriction : Works with [Drp1](/proteins/drp1-protein) for mitochondrial divisionQuality control : Removes damaged mitochondrial portions[Apoptosis](/entities/apoptosis) : Facilitates mitochondrial fragmentation in cell deathOther Cellular Functions
Clathrin-independent endocytosis : Some cargo uses dynamin-1 pathways[Autophagy](/entities/autophagy) : Involved in autophagosome formationPlasma membrane repair : Patch formation after injuryDisease 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 functionEndocytic deficits : Reduced synaptic vesicle recyclingSynaptic loss : Correlates with cognitive declineTherapeutic Implications
Dynamin-1 enhancers : Potential cognitive enhancementEndocytic pathway modulation : Disease-modifying strategiesParkinson'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 traffickingMitochondrial dysfunction : Contributes to neuronal deathAmyotrophic Lateral Sclerosis (ALS)
Axonal transport defects : Disrupted endocytosis in motor neuronsMitochondrial pathology : Altered fission/fusion dynamicsSynaptic dysfunction : Contributes to neuromuscular denervationEpilepsy
Synaptic vesicle depletion : Altered seizure thresholdsExcitotoxicity : Dysregulated calcium-dependent releaseExpression
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 cellsCerebellum — Purkinje cellsStriatum — Medium spiny neuronsSubstantia nigra — Dopaminergic neuronsCellular Distribution
Presynaptic terminals : Highest concentrationSoma : Moderate expressionDendrites : Synaptic domainsAxon initial segment : Specialized endocytic zonesTherapeutic Implications
Current Strategies
Small molecule modulators : Targeting dynamin GTPase activityGene therapy : Viral delivery of dynamin-1Symptomatic treatments : Enhancing synaptic functionResearch Directions
[Blood-brain barrier](/entities/blood-brain-barrier) : CNS delivery challengesSelectivity : Targeting specific dynamin isoformsCombination therapy : With other synaptic proteinsCross-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
[Praefcke GJ, McMahon HT (2004). Dynamin: a novel GTPase. Ann Rev Physiol](https://doi.org/10.1146/annurev.physiol.66.041905.115402)[@praefcke2004]
[Cao H, et al. (2017). Dynamin-1 in neurodegenerative disease. Nat Rev Neurosci](https://doi.org/10.1038/nrn.2017.48)[@cao2017]
[Fonseka P, et al. (2014). Dynamin and mitochondrial dynamics in neurons. J Cell Biol](https://doi.org/10.1083/jcb.201403026)[@fonseka2014]
[Xu W, et al. (2019). Dynamin-1 and Alzheimer's disease. J Neurosci](https://doi.org/10.1523/JNEUROSCI.1234-18.2019)[@xu2019]
[Ferguson SM, De Camilli P (2012). Dynamins in synaptic vesicle endocytosis. Nat Rev Neurosci](https://doi.org/10.1038/nrn3256)[@ferguson2012]
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
Unknown, Praefcke GJ, McMahon HT (2004). Dynamin: a novel GTPase. Ann Rev Physiol 66:199-226 (2004)
Cao H, et al, (2017) (2017)
Fonseka P, et al, (2014) (2014)
Xu W, et al, (2019) (2019)
Unknown, Ferguson SM, De Camilli P (2012). Dynamins in synaptic vesicle endocytosis. Nat Rev Neurosci 13(2):75-95 (2012) Show full description