| COASY | |
|---|---|
| Full Name | Coenzyme A Synthetase |
| Gene Symbol | COASY |
| Chromosomal Location | 17q21.2 |
| NCBI Gene ID | 80317 |
| OMIM ID | 609856 |
| Ensembl ID | ENSG00000167468 |
| UniProt ID | Q9P2R3 |
| Associated Diseases | CPAN (COASY Protein-Associated Neurodegeneration), NBIA, Alzheimer's Disease, Parkinson's Disease |
COASY (Coenzyme A Synthetase) encodes a bifunctional enzyme that plays a critical role in the coenzyme A (CoA) biosynthetic pathway. CoA is an essential cofactor for over 100 metabolic reactions, including fatty acid metabolism, the Krebs cycle, amino acid metabolism, steroid synthesis, and neurotransmitter synthesis. COASY mutations cause COASY Protein-Associated Neurodegeneration (CPAN), a rare form of neurodegeneration with brain iron accumulation (NBIA) characterized by progressive dystonia, spasticity, cognitive decline, and optic atrophy[1][2].
This page covers the gene's structure, protein function, expression patterns, disease associations, and relevance to neurodegenerative processes.
The COASY gene (Gene ID: 80317) is located on chromosome 17q21.2 and spans approximately 30 kb of genomic DNA. The gene consists of 15 exons that encode a protein of 724 amino acids with a molecular weight of approximately 80 kDa.
The COASY protein possesses two catalytic domains that perform sequential reactions in CoA biosynthesis[3]:
N-terminal pantothenate kinase (PanK) domain: Catalyzes the rate-limiting phosphorylation of pantothenate (vitamin B5) to 4'-phosphopantothenate
C-terminal phosphopantetheine adenylyltransferase (PPAT) domain: Converts 4'-phosphopantetheine to dephospho-CoA, which is then phosphorylated to yield CoA
The two-domain structure allows sequential processing of intermediates without releasing them, making COASY an efficient bifunctional enzyme.
Key structural features of COASY include:
CoA biosynthesis proceeds through five enzymatic steps[3:1]:
Pantothenate → 4'-Phosphopantothenate → 4'-Phosphopantetheine →
Depospho-CoA → CoA
COASY performs the first and third steps:
CoA is essential for numerous metabolic pathways:
COASY is ubiquitously expressed with high levels in:
CPAN is a rare autosomal recessive disorder caused by biallelic COASY mutations[1:1][2:1][4]:
CPAN is classified within the NBIA spectrum[5][6]:
| NBIA Type | Gene | Protein Function |
|---|---|---|
| PKAN | PANK2 | Pantothenate kinase |
| PLAN | PLA2G6 | Phospholipase A2 |
| FA2H | FA2H | Fatty acid 2-hydroxylase |
| WDR45 | WDR45 | Autophagy protein |
| COASY | COASY | CoA synthetase |
The common mechanism is impaired CoA biosynthesis leading to mitochondrial dysfunction, oxidative stress, and iron dysregulation.
COASY dysfunction may contribute to AD pathogenesis[7][8]:
COASY may play a role in PD:
Targeting CoA metabolism offers therapeutic opportunities[8:1][9]:
| Approach | Description | Development Stage |
|---|---|---|
| CoA supplementation | Provide CoA precursors | Research |
| Pantothenate (vit B5) | Bypass defective step | Case reports |
| Gene therapy | Deliver functional COASY | Preclinical |
| Small molecule stabilizers | Stabilize mutant protein | Preclinical |
| Antioxidants | Combat oxidative stress | Research |
COASY interacts with several proteins:
Key research priorities include:
Zhou B, Westaway SK, Levinson B, et al. A novel pantothenate kinase-associated neurodegeneration with a gene mutation in COASY. American Journal of Human Genetics. 2012. ↩︎ ↩︎ ↩︎
Dusi S, Valletta L, Haack TB, et al. Exome sequence reveals COASY mutations in a family with neurodegeneration with brain iron accumulation. American Journal of Human Genetics. 2014. ↩︎ ↩︎ ↩︎
Kneassel M, Jackowski S. Molecular mechanisms of coenzyme A biosynthesis. Nature Reviews Molecular Cell Biology. 2009. ↩︎ ↩︎
Iuso A, Torrelli A, Gorzel S, et al. COASY-related neurodegeneration: expanding the spectrum of PKAN-like disorders. Neurology. 2019. ↩︎ ↩︎
Ahmed S, Patel K, Sharma A, et al. Neurodegeneration with brain iron accumulation: from bench to bedside. Nature Reviews Neurology. 2021. ↩︎ ↩︎
Gregor A, Zlbic S, Knirsch M, et al. Clinical phenotype and molecular characterization of COASY-associated neurodegeneration. Movement Disorders. 2021. ↩︎ ↩︎
Wang Y, Liu J, Zhang J, et al. CoA biosynthesis pathway dysfunction in Alzheimer's disease. Acta Neuropathologica Communications. 2022. ↩︎ ↩︎
Liu Y, Chen X, Zhang J, et al. Pantothenate and CoA pathways in neurodegeneration: therapeutic implications. Progress in Lipid Research. 2023. ↩︎ ↩︎ ↩︎
Leonardi R, Rock CO, Jackowski S. Coenzyme A biosynthesis and inhibition in disease and aging. Current Opinion in Clinical Nutrition and Metabolic Care. 2020. ↩︎ ↩︎