DRP1 (dynamin-related protein 1), encoded by the DNM1L gene on chromosome 12p11.2, is a large GTPase that drives mitochondrial and peroxisomal fission[1]. 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[2][3].
| Attribute | Value |
|---|---|
| Protein Name | DRP1 (Dynamin-1-like Protein) |
| Gene | DNM1L |
| UniProt ID | O00429 |
| Molecular Weight | ~82 kDa |
| Amino Acids | 736 |
| Subcellular Localization | Cytosol, mitochondrial outer membrane, peroxisomes |
| Protein Family | Dynamin superfamily, large GTPase |
| Expression | Brain (high in neurons), heart, skeletal muscle |
DRP1 contains:
DRP1 is primarily cytosolic at baseline and is recruited to mitochondrial outer membranes by receptor/adaptor proteins including[1:1][4]:
Oligomerized DRP1 forms ring-like assemblies (spirals of 14-17 protomers) that encircle mitochondria[4:1]. GTP hydrolysis drives conformational changes that constrict the membrane in a power-stroke mechanism.
DRP1 function is strongly tuned by post-translational modifications[5]:
In healthy CNS tissue, DRP1 supports[2:1][3:1]:
Because neurons are post-mitotic and metabolically constrained, even moderate chronic DRP1 dysregulation can propagate oxidative stress, ATP deficits, and synaptic failure over time[6][3:2].
AD models consistently show altered mitochondrial dynamics with increased fission signatures and fragmented organelles[6:1][7]:
DRP1 interacts functionally with Aβ-associated stress programs[7:1][8]:
In Parkinson's disease, mitochondrial quality-control pathways intersect with DRP1-regulated fission[3:3][9]:
DRP1-modulating strategies are mechanistically attractive in PD[9:1]:
DRP1 is a high-interest but high-risk target: both over-inhibition and over-activation can be harmful if normal remodeling is suppressed[2:2][9:2].
| Strategy | Compound | Stage | Notes |
|---|---|---|---|
| DRP1 GTPase inhibitor | Mdivi-1 | Preclinical | Partial specificity |
| DRP1-DN interface | P110 | Preclinical | Blocks DRP1 recruitment |
| Peptide inhibitors | Tat-Drp1 | Preclinical | Cell-permeable |
| Mdivi-1 analogs | Novel derivatives | Early discovery | Improved selectivity |
| Marker | Sample | Change in Disease | Utility |
|---|---|---|---|
| DRP1 levels | Brain tissue | Elevated in AD/PD | Research |
| phospho-DRP1 (S616) | Neurons | Increased | Mechanistic |
| Mitochondrial morphology | Fibroblasts | Fragmented | Patient stratification |
| NfL | CSF/blood | Elevated with mitochondrial dysfunction | Monitoring |
Smirnova E, Griparic L, Shurland DL, van der Bliek AM. Dynamin-related protein Drp1 is required for mitochondrial division in mammalian cells. Molecular Biology of the Cell. 2001. ↩︎ ↩︎
Chan DC. Mitochondrial dynamics and its involvement in disease. Annual Review of Pathology. 2020. ↩︎ ↩︎ ↩︎
Pickrell AM, Youle RJ. The roles of PINK1, parkin, and mitochondrial fidelity in Parkinson's disease. Neuron. 2015. ↩︎ ↩︎ ↩︎ ↩︎
Otera H, Ishihara N, Mihara K. New insights into the function and regulation of mitochondrial fission. Biochimica et Biophysica Acta. 2013. ↩︎ ↩︎
Chang CR, Blackstone C. Dynamic regulation of mitochondrial fission through modification of the dynamin-related protein Drp1. Annals of the New York Academy of Sciences. 2010. ↩︎
Wang X, Su B, Lee HG, et al. Impaired balance of mitochondrial fission and fusion in Alzheimer's disease. Journal of Neuroscience. 2009. ↩︎ ↩︎
Manczak M, Calkins MJ, Reddy PH. Impaired mitochondrial dynamics and abnormal interaction of amyloid beta with mitochondrial protein Drp1 in neurons from patients with Alzheimer's disease. Human Molecular Genetics. 2011. ↩︎ ↩︎
Khalil B, McWilliams Y, Kuhns R, et al. DRP1-mediated mitochondrial fission regulates tau pathology and neurodegeneration in Alzheimer's disease. Acta Neuropathologica. 2022. ↩︎ ↩︎
Joshi AU, Kornfeld OS, Mochly-Rosen D. The entangled ER-mitochondrial axis as a potential therapeutic strategy in neurodegeneration. Nature Reviews Neurology. 2019. ↩︎ ↩︎ ↩︎
Gao J, Wang L, Liu J, et al. Mitochondrial abnormalities, mitochondrial dynamics, and neurodegenerative diseases. Neurobiology of Disease. 2022. ↩︎