Aif 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.
| Apoptosis-Inducing Factor | |
|---|---|
| Protein Name | Apoptosis-Inducing Factor (AIF) |
| Gene | AIFM1 |
| UniProt ID | O95331 |
| PDB ID | 1M6I, 3JVT |
| Molecular Weight | 63 kDa |
| Subcellular Localization | Mitochondrial inner membrane (cristae) |
| Protein Family | AIF 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.
AIF is a flavoprotein with three functional domains: an N-terminal mitochondrial targeting sequence, a central domain with homology to oxidoreductases, and a C-terminal DNA-binding domain. The protein binds FAD as a cofactor. In its inactive form, AIF is tethered to the inner mitochondrial membrane with a portion of the protein protruding into the intermembrane space.
Under normal conditions, AIF functions as a mitochondrial NADH oxidase. It contributes to the electron transport chain and helps maintain mitochondrial redox balance. AIF is essential for embryonic development—knockout mice die in utero with severe brain abnormalities.
During apoptosis, AIF is cleaved from its mitochondrial tether and released into the cytosol. Unlike cytochrome c, AIF-mediated cell death is caspase-independent. Once in the nucleus, AIF recruits ENDOG (Endonuclease G) and causes large-scale DNA fragmentation (50-300 kb fragments). This caspase-independent pathway is prominent in:
The study of Aif 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.