| Protein Name | Peripherin |
|---|
| Gene | [PRPH](/genes/PRPH) |
|---|
| UniProt ID | [P21980](https://www.uniprot.org/uniprot/P21980) |
|---|
| PDB Structure | 3NCL |
|---|
| Molecular Weight | 57 kDa (475 amino acids) |
|---|
| Subcellular Localization | Cytoplasm, neuronal processes |
|---|
| Protein Family | Intermediate filament family (Type III) |
|---|
Prph Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
Peripherin (encoded by the PRPH gene) is a Type III intermediate filament protein expressed primarily in peripheral neurons and select populations of central neurons. It plays essential roles in neuronal development, axonal maintenance, and has been implicated in the pathogenesis of amyotrophic lateral sclerosis (ALS) and other neurodegenerative diseases. Peripherin forms heterodimers with other intermediate filament proteins and is particularly abundant in sensory and motor neurons.
Peripherin has the characteristic structure of Type III intermediate filaments:
- Alpha-helical rod domain: Central coiled-coil region (~310 aa) for dimerization
- Head domain (N-terminal): Non-helical region involved in assembly regulation
- Tail domain (C-terminal): Variable region with tissue-specific functions
- Forms heterodimers with NF-L and α-internexin
- Can substitute for NF-M in neuronal intermediate filaments
- Interacts with cytoskeletal scaffolding proteins
- Axonal outgrowth: Guides axonal extension during development
- Neurite extension: Supports process formation in differentiating neurons
- Synapse formation: Associated with synaptic vesicles
¶ Maintenance
- Axonal stability: Provides structural support in mature neurons
- Transport scaffold: Coordinates with neurofilaments
- Membrane organization: Associates with plasma membrane
- Peripheral sensory neurons (dorsal root ganglia)
- Motor neurons (spinal cord)
- Enteric nervous system
- Some central neuron populations
Peripherin is implicated in ALS through multiple mechanisms:
- Aggregation: Forms inclusion bodies in motor neurons
- Mutations: Rare PRPH mutations associated with ALS
- Dysregulated expression: Altered levels in disease
- Interaction with SOD1: May facilitate mutant SOD1 aggregation
- Peripheral nerve involvement: Explains peripheral axonopathy
- Charcot-Marie-Tooth Disease: Peripheral neuropathy phenotypes
- Alzheimer's Disease: Colocalization with amyloid plaques
- Parkinson's Disease: Lewy body involvement
| Mechanism |
Description |
| Aggregation |
Toxic inclusion formation |
| Dysfunction |
Impaired axonal transport |
| Proteostasis |
Impaired protein clearance |
| Interaction |
Cross-seeding with other proteins |
- Aggregation inhibitors: Prevent toxic oligomer formation
- Protein homeostasis enhancers: Boost autophagy/ubiquitin system
- Gene therapy: Suppress mutant expression
- PRPH fragments in CSF as disease markers
- Peripheral nerve involvement monitoring
- Motor neurons: High susceptibility
- Dorsal root ganglia: Affected in peripheral neuropathies
- Enteric neurons: GI dysfunction in ALS
- PRPH transgenic mice show motor neuron pathology
- Knockout mice have subtle axonal defects
- Portier MM, et al. (1983) Peripherin, a new intermediate filament protein. Dev Biol.
- Beaulieu JM, et al. (1999) Role of peripherin in ALS. J Cell Biol.
- Lambrechts D, et al. (2003) Peripherin and ALS. Neuromolecular Med.
Prph Protein plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.
The study of Prph Protein has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.
Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.
- Portier MM, et al. (1983). Peripherin, a new intermediate filament protein of neuronal origin. Dev Biol. PMID:6229568
- Beaulieu JM, et al. (1999). Peripherin is a marker of axonal degeneration in ALS. J Cell Biol. PMID:10449527
- Lambrechts D, et al. (2003). Correlation between peripherin expression and motor neuron vulnerability. Neuromolecular Med. PMID:14535557
- Robertson J, et al. (2002). Peripherin in sporadic ALS. Acta Neuropathol. PMID:12483326
- Xiao S, et al. (2006). Peripherin and ALS. J Neuropathol Exp Neurol. PMID:17021402
- McLean JR, et al. (2014). ALS peripherin and neurofilament inclusion. J Neurosci. PMID:24760863
- Carpenteur J, et al. (2019). Peripherin in axonal degeneration. Mol Neurobiol. PMID:30659476
- Gros-Louis F, et al. (2010). Mutations in PRPH associated with ALS. Neurobiol Aging. PMID:20018403