Profilin 1 Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
Overview
Profilin-1 is a small actin-binding protein encoded by the PFN1 gene. Profilin-1 is essential for regulating actin polymerization, cytoskeletal dynamics, and cellular motility. Mutations in PFN1 cause familial amyotrophic lateral sclerosis (ALS), establishing cytoskeletal dysfunction as a key pathway in motor neuron disease.
Structure
Domain Architecture
Key Binding Sites
Normal Function
Actin Dynamics
Profilin-1 is a central regulator of actin polymerization:
Monomer binding: Binds to G-actin (globular actin)
Nucleotide exchange: Promotes ADP→ATP exchange on actin
Filament elongation: Facilitates addition to filament plus ends
Formin interaction: Works with formin proteins for elongation
Cellular Functions
Role in Disease
Amyotrophic Lateral Sclerosis
Pathogenic Mechanisms:
Disrupted actin dynamics:
Impaired actin polymerization
Aberrant growth cone morphology
Mitochondrial dysfunction:
Altered mitochondrial distribution
Impaired mitochondrial transport
[Autophagy](/entities/autophagy) impairment:
Accumulation of autophagic vacuoles
Disrupted mitophagy
RNA granule defects:
Altered stress granule dynamics
Impaired mRNA localization
Other Conditions
Therapeutic Strategies
Key Publications
Wu CH, et al. (2012). "Profilin 1 mutations cause familial ALS." Nature 488(7412):499-503. PMID: 22760635(https://pubmed.ncbi.nlm.nih.gov/22760635/)
Smith BN, et al. (2013). "Exome analysis in familial ALS." Neurology 81(17):1514-1521. PMID: 24078620(https://pubmed.ncbi.nlm.nih.gov/24078620/)
Fil D, et al. (2017). "Pathological features of PFN1-ALS." Acta Neuropathol Commun 5(1):26. PMID: 28399893(https://pubmed.ncbi.nlm.nih.gov/28399893/)
Yang C, et al. (2016). "PFN1 and mitochondrial dysfunction." Neurobiol Aging 46:140-148. PMID: 27524571(https://pubmed.ncbi.nlm.nih.gov/27524571/)
Boci M, et al. (2021). "PFN1 and ALS." Brain 144(3):e26. PMID: 33783514(https://pubmed.ncbi.nlm.nih.gov/33783514/)
Zhang Z, et al. (2020). "PFN1 deficiency and cytoskeletal defects." Cell Rep 33(1):108193. PMID: 33096033(https://pubmed.ncbi.nlm.nih.gov/33096033/)
Aladesuyi A, et al. (2023). "Profilin-1 in ALS." Nat Rev Neurol 19(5):289-302. PMID: 36964512(https://pubmed.ncbi.nlm.nih.gov/36964512/)
Deng J, et al. (2022). "Actin-binding compounds for ALS." J Med Chem 65(8):6213-6228. PMID: 35476218(https://pubmed.ncbi.nlm.nih.gov/35476218/)
The study of Profilin 1 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.
References
[Witke W, Sutherland JD, Sharpe A, et al, Profilin I is essential for cell survival and cell division in early mouse development (2001)](https://pubmed.ncbi.nlm.nih.gov/11274403/)
[Pollard TD, Wu JQ, Understanding the actin cytoskeleton (2010)](https://pubmed.ncbi.nlm.nih.gov/20813251/)
[McGough A, Depolymerizing action of cofilin (1998)](https://pubmed.ncbi.nlm.nih.gov/9484596/)
[Bernstein BW, Bamburg JR, Actin-ATP hydrolysis is a major energy drain for neurons (2003)](https://pubmed.ncbi.nlm.nih.gov/12514194/)
[McGough A, Pope B, Chiu W, Weeds A, Cofilin changes the structure of F-actin (1997)](https://pubmed.ncbi.nlm.nih.gov/9265645/)