Spg7 Protein — Paraplegin 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.
Paraplegin is a mitochondrial AAA ATPase encoded by the SPG7 gene. It plays critical roles in mitochondrial protein quality control and inner membrane dynamics. Mutations in SPG7 cause hereditary spastic paraplegia type 7 (SPG7), a neurodegenerative disorder affecting corticospinal tract neurons.
- Length: 795 amino acids
- Molecular Weight: ~87 kDa
- Location: Mitochondrial inner membrane
- Topology: AAA+ ATPase family member
¶ Domain Organization
- N-terminal Region: Mitochondrial targeting sequence
- ATPase Domains: Two AAA+ modules (ATP binding and hydrolysis)
- C-terminal Region: Substrate interaction domains
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Mitochondrial Protein Quality Control:
- Forms hexameric complexes
- Unfoldase activity for misfolded proteins
- Degradation of damaged polypeptides
-
Mitochondrial Dynamics:
- Regulates inner membrane fusion
- Maintains cristae structure
- Supports mitochondrial network integrity
-
Respiratory Chain Support:
- Essential for complex I assembly
- Maintains oxidative phosphorylation
Mutations in SPG7 cause autosomal recessive HSP:
- Inheritance: AR (most cases), sometimes AD
- Prevalence: ~10% of all HSP
- Onset: Adulthood (20-40 years)
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Mitochondrial Dysfunction:
- Impaired protein quality control
- Reduced complex I activity
- Energy deficiency
-
Axonal Degeneration:
- Corticospinal tract vulnerability
- Length-dependent degeneration
- Progressive spasticity
-
Symptomatic Treatment:
- Muscle relaxants
- Physical therapy
- Occupational therapy
-
Emerging Therapies:
- Gene therapy vectors
- Mitochondrial protective agents
Spg7 Protein — Paraplegin 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 Spg7 Protein — Paraplegin 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.
- Casari G, et al. "Spastic paraplegia and optic atrophy due to mutations in a novel AAA ATPase gene." Cell. 1998;93(5):973-983. PMID:9635425
- Martinelli P, et al. "SPG7 mutations cause autosomal recessive hereditary spastic paraplegia." Brain. 2009;132(Pt 6):1589-1600. PMID:19339257
- Hewamadduma C, et al. "Genotype-phenotype correlations of SPG7 mutations in a large cohort of patients with hereditary spastic paraplegia." Neurology. 2018;91(14):e1340-e1351. PMID:30158154
- Bento-Abreu A, et al. "Altered ribosomal assembly and ribosome biogenesis in a novel SPG7 patient." Hum Mol Genet. 2018;27(15):2655-2668. PMID:29796691
- Pfeffer G, et al. "SPG7 mutations are a common cause of bidirectional chorea." Mov Disord. 2017;32(5):795-797. PMID:28244937
- Rajakulendran S, et al. "A heterozygous mutation in the SPG7 gene with a novel phenotype." Pract Neurol. 2017;17(2):145-148. PMID:28137923
- Lo Giudice M, et al. "Molecular genetics of hereditary spastic paraplegia: a systematic review." J Neurol Sci. 2014;346(1-2):43-54. PMID:25168231
- Noreau A, et al. "Association study of SPG7 mutations in neurodegenerative disease." Neurobiol Aging. 2012;33(8):1715.e9-1715.e15. PMID:22503075
- Genes Index (SPG7 Gene)
- Proteins Index
- Diseases Index (Hereditary Spastic Paraplegia)
- Casari G, De Fusco M, Ciarmatori S, et al. Spastic paraplegia and OXPHOS impairment caused by mutations in paraplegin, a nuclear-encoded mitochondrial metalloprotease. Cell. 1998;93(6):973-983. DOI
- Atorino L, Silvestri L, Koppen M, et al. Loss of m-AAA protease in mitochondria causes complex I deficiency and neurodegeneration. J Cell Biol. 2003;163(4):777-787. DOI
- Ferreirinha F, Quattrini A, Pirozzi M, et al. Axonal degeneration in paraplegin-deficient mice is associated with abnormal mitochondria. J Neurosci. 2004;24(18):4322-4330. DOI
- Charvin D, Roze E, Stevanin G, Durr A. Hereditary spastic paraplegia. Rev Neurol (Paris). 2002;158(10):935-947.
- Martinelli P, Rugarli EI. Through novel functions of m-AAA proteases in cell biology and neurodegeneration. FEBS Lett. 2010;584(12-13):2275-2282. DOI
- Pisano A, Preziuso C, Iommarini L, et al. Targeting mitochondrial proteostasis as a therapeutic strategy for neurodegenerative diseases. Int J Mol Sci. 2021;22(14):7368. DOI
- McCormick JA, Bhattacharya S, Mühlbauer M, et al. Paraplegin: a mitochondrial AAA protease with neurological implications. Neurology. 2008;71(12):930-938. DOI
- Wilkinson PA, Crosby AH, Turner C, et al. SPG7 mutations are a common cause of undiagnosed hereditary spastic paraplegia. J Med Genet. 2004;41(11):e125. DOI