DRP1 Protein (Dynamin-1-like Protein)

DRP1 Protein (Dynamin-1-like Protein)

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">DRP1 Protein (Dynamin-1-like Protein)</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>DRP1 (Dynamin-1-like Protein)</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>[DNM1L](/genes/dnm1l)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[O00429](https://www.uniprot.org/uniprot/O00429)</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~82 kDa</td>
</tr>
<tr>
<td class="label">Amino Acids</td>
<td>736</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytosol, mitochondrial outer membrane, peroxisomes</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>Dynamin superfamily, large GTPase</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Brain (high in neurons), heart, skeletal muscle</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Compound</td>
</tr>
<tr>
<td class="label">DRP1 GTPase inhibitor</td>
<td>Mdivi-1</td>
</tr>
<tr>
<td class="label">DRP1-DN interface</td>
<td>P110</td>
</tr>
<tr>
<td class="label">Peptide inhibitors</td>
<td>Tat-Drp1</td>
</tr>
<tr>
<td class="label">Mdivi-1 analogs</td>
<td>Novel derivatives</td>
</tr>
<tr>
<td class="label">Marker</td>
<td>Sample</td>
</tr>
<tr>
<td class="label">DRP1 levels</td>
<td>Brain tissue</td>
</tr>
<tr>
<td class="

DRP1 Protein (Dynamin-1-like Protein)

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">DRP1 Protein (Dynamin-1-like Protein)</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>DRP1 (Dynamin-1-like Protein)</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>[DNM1L](/genes/dnm1l)</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>[O00429](https://www.uniprot.org/uniprot/O00429)</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~82 kDa</td>
</tr>
<tr>
<td class="label">Amino Acids</td>
<td>736</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytosol, mitochondrial outer membrane, peroxisomes</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>Dynamin superfamily, large GTPase</td>
</tr>
<tr>
<td class="label">Expression</td>
<td>Brain (high in neurons), heart, skeletal muscle</td>
</tr>
<tr>
<td class="label">Strategy</td>
<td>Compound</td>
</tr>
<tr>
<td class="label">DRP1 GTPase inhibitor</td>
<td>Mdivi-1</td>
</tr>
<tr>
<td class="label">DRP1-DN interface</td>
<td>P110</td>
</tr>
<tr>
<td class="label">Peptide inhibitors</td>
<td>Tat-Drp1</td>
</tr>
<tr>
<td class="label">Mdivi-1 analogs</td>
<td>Novel derivatives</td>
</tr>
<tr>
<td class="label">Marker</td>
<td>Sample</td>
</tr>
<tr>
<td class="label">DRP1 levels</td>
<td>Brain tissue</td>
</tr>
<tr>
<td class="label">phospho-DRP1 (S616)</td>
<td>Neurons</td>
</tr>
<tr>
<td class="label">Mitochondrial morphology</td>
<td>Fibroblasts</td>
</tr>
<tr>
<td class="label">NfL</td>
<td>CSF/blood</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/ad" style="color:#ef9a9a">AD</a>, <a href="/wiki/ali" style="color:#ef9a9a">ALI</a>, <a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">581 edges</a></td>
</tr>
</table>

[DRP1](/proteins/drp1-protein) (dynamin-related protein 1), encoded by the [DNM1L](/genes/dnm1l) gene on chromosome 12p11.2, is a large GTPase that drives mitochondrial and peroxisomal fission[@smirnova2001]. Balanced DRP1 activity is essential for neuronal survival because mitochondria in neurons must be continuously distributed, remodeled, and quality-controlled across long axons and high-energy synapses. Excessive fission or defective fission both cause pathology, placing DRP1 at a central control point in mitochondrial dysfunction across neurodegenerative disorders[@chan2020][@pickrell2015].

Protein Information

Structure and Activation Cycle

Domain Architecture

DRP1 contains:

• N-terminal GTPase domain (1-300 aa): Catalyzes GTP hydrolysis for membrane constriction
• Middle domain (300-500 aa): Self-assembly interface for oligomerization
• BSE (bundle signaling element) (500-600 aa): Communication between GTPase and GED
• GED (GTPase effector domain) (600-736 aa): Regulatory, stimulates GTP hydrolysis

Mitochondrial Recruitment

DRP1 is primarily cytosolic at baseline and is recruited to mitochondrial outer membranes by receptor/adaptor proteins including[@smirnova2001][@otera2013]:

• MFF (Mitochondrial Fission Factor): Primary receptor, tail-anchored protein
• FIS1 (Fission protein 1): Binds DRP1 via tetratricopeptide repeats
• MiD49 (Mitochondrial dynamics protein 49)
• MiD51 (Mitochondrial dynamics protein 51)

Oligomerization and Fission

Oligomerized DRP1 forms ring-like assemblies (spirals of 14-17 protomers) that encircle mitochondria[@otera2013]. GTP hydrolysis drives conformational changes that constrict the membrane in a power-stroke mechanism.

Post-Translational Regulation

DRP1 function is strongly tuned by post-translational modifications[@chang2010]:

• S616 phosphorylation (by CDK1, CAMK1): Promotes mitochondrial recruitment and fission
• S637 phosphorylation (by PKA): Inhibits fission, promotes fusion
• S637 dephosphorylation (by calcineurin): Activates fission
• SUMOylation (by SUMO1): Stabilizes mitochondrial recruitment
• ubiquitination (by MARCH5, Parkin): Targets DRP1 for degradation

Physiologic Role in the Nervous System

In healthy CNS tissue, DRP1 supports[@chan2020][@pickrell2015]:

Because neurons are post-mitotic and metabolically constrained, even moderate chronic DRP1 dysregulation can propagate oxidative stress, ATP deficits, and synaptic failure over time[@wang2009][@pickrell2015].

Role in Alzheimer's Disease

Mitochondrial Fission/Fusion Imbalance

AD models consistently show altered mitochondrial dynamics with increased fission signatures and fragmented organelles[@wang2009][@manczak2011]:

• Fragmented mitochondria: Accumulation of small, spherical mitochondria in AD neurons
• Reduced mitochondrial length: Decreased mean mitochondrial length in AD hippocampus
• Impaired distribution: Abnormal mitochondrial localization in dystrophic neurites

DRP1-Amyloid Interactions

DRP1 interacts functionally with Aβ-associated stress programs[@manczak2011][@khalil2022]:

• Aβ binds DRP1: Direct interaction promotes DRP1 activation and excessive fission
• Synaptic dysfunction: Fragmented mitochondria fail to support synaptic energy demands
• Neuronal vulnerability: Fission-induced ROS production sensitizes neurons to Aβ toxicity

DRP1-Tau Interactions

• Tau phosphorylation: CDK5 and GSK3β (activated in AD) phosphorylate DRP1 at S616
• Enhanced fission: Phospho-DRP1 drives mitochondrial fragmentation
• Transport deficits: Fragmented mitochondria impair axonal transport to synapses
• Vicious cycle: Mitochondrial dysfunction promotes tau pathology[@khalil2022]

Role in Parkinson's Disease

PINK1/Parkin-Mitochondrial Quality Control

In Parkinson's disease, mitochondrial quality-control pathways intersect with DRP1-regulated fission[@pickrell2015][@joshi2019]:

• PINK1/Parkin pathway: Labels damaged mitochondria for autophagic degradation
• DRP1 in mitophagy: Fission enables segregation of damaged mitochondrial segments for removal
• Dopaminergic vulnerability: Nigral neurons have high mitochondrial stress due to Pacemaker activity

Pathogenic Mutations

• LRRK2 mutations: G2019S LRRK2 affects mitochondrial dynamics, increasing DRP1 recruitment
• Alpha-synuclein: Overexpression leads to DRP1-mediated mitochondrial fragmentation
• Parkin mutations: Loss of Parkin function leads to accumulation of damaged mitochondria

Therapeutic Implications

DRP1-modulating strategies are mechanistically attractive in PD[@joshi2019]:

• Partial normalization: Rather than full fission blockade, moderate reduction of hyperactive DRP1
• Combination approaches: DRP1 modulation + mitophagy enhancement + bioenergetic support

Role in Other Neurodegenerative Diseases

ALS

• DRP1 hyperactivation has been implicated in models of axonal energy failure
• TDP-43 pathology affects mitochondrial dynamics via DRP1 regulation
• Axonal mitochondrial transport deficits precede motor neuron death[@gao2022]

Huntington's Disease

• Mutant huntingtin binds DRP1, enhancing fission and mitochondrial fragmentation
• BDNF transport impairment due to abnormal mitochondrial dynamics

Therapeutic Targeting

DRP1 is a high-interest but high-risk target: both over-inhibition and over-activation can be harmful if normal remodeling is suppressed[@chan2020][@joshi2019].

Current Strategies

Challenges

Biomarkers

Cross-Links

• [DNM1L Gene](/genes/dnm1l)
• [Mitochondrial Dysfunction Mechanisms](/mechanisms/mitochondrial-dysfunction)
• [Mitophagy Pathway](/mechanisms/mitophagy-pathway)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Mitochondrial Dynamics](/mechanisms/mitochondrial-dynamics)

See Also

• [MFF Protein](/proteins/mff-protein) — DRP1 receptor
• [FIS1 Protein](/proteins/fis1-protein) — DRP1 receptor
• [OPA1 Protein](/proteins/opa1-protein) — mitochondrial fusion
• [PINK1 Protein](/proteins/pink1-protein) — mitophagy in PD
• [Parkin Protein](/proteins/parkin-protein) — mitophagy in PD

References