Cytochrome C 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.
| Cytochrome c | |
|---|---|
| Protein Name | Cytochrome c |
| Gene | CYCS |
| UniProt ID | P99999 |
| PDB ID | 1J3B, 2N4J |
| Molecular Weight | 12.2 kDa |
| Subcellular Localization | Mitochondrial intermembrane space |
| Protein Family | Cytochrome c family |
This page provides comprehensive information about the subject's role in neurodegenerative diseases. The subject participates in various molecular pathways and cellular processes relevant to Alzheimer's disease, Parkinson's disease, and related conditions.
Cytochrome c is a small heme protein consisting of a single polypeptide chain of 104 amino acids that non-covalently binds a heme group. The protein adopts a distinctive fold with the heme group buried in a hydrophobic pocket. The heme iron is coordinated by two histidine residues. Cytochrome c contains a characteristic C-terminal extension that helps anchor it to the inner mitochondrial membrane.
In normal cellular physiology, cytochrome c serves as an essential electron carrier in the mitochondrial electron transport chain (ETC), shuttling electrons between Complex III (cytochrome bc1) and Complex IV (cytochrome c oxidase). This function is critical for oxidative phosphorylation and ATP production. Cytochrome c also has peroxidase activity and can participate in antioxidant defense.
During apoptosis, cytochrome c is released from the mitochondrial intermembrane space into the cytosol following mitochondrial outer membrane permeabilization (MOMP). This release is regulated by the BCL2 family of proteins. In the cytosol, cytochrome c binds to APAF1 and, in the presence of dATP/ATP, forms the apoptosome—a heptameric complex that recruits and activates procaspase-9. This initiates the caspase cascade leading to programmed cell death.
Dysregulated cytochrome c release contributes to:
The study of Cytochrome C 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.