AIFM1 Protein — Apoptosis-Inducing Factor

AIFM1 Protein — Apoptosis-Inducing Factor

Introduction

Aifm1 Protein — [Apoptosis](/entities/apoptosis) Inducing Factor 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

AIFM1 Protein — Apoptosis-Inducing Factor

Introduction

Aifm1 Protein — [Apoptosis](/entities/apoptosis) Inducing Factor 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

<div class="infobox infobox-protein"> [@supsup2023]
<h3>AIFM1 Protein</h3> [@supsup2010]
<table> [@supsup2021]
<tr><th>Protein Name</th><td>Apoptosis-Inducing Factor, Mitochondria-Associated 1</td></tr> [@supsup2022]
<tr><th>Gene</th><td>[AIFM1](/genes/aifm1)</td></tr>
<tr><th>UniProt ID</th><td>[O95831](https://www.uniprot.org/uniprot/O95831)</td></tr>
<tr><th>Protein Size</th><td>613 amino acids (~63 kDa)</td></tr>
<tr><th>Subcellular Localization</th><td>Inner mitochondrial membrane (mature form); nucleus (during apoptosis)</td></tr>
<tr><th>Protein Family</th><td>FAD-dependent oxidoreductases; AIF family</td></tr>
<tr><th>PDB Structures</th><td>[1GV4](https://www.ebi.ac.uk/pdbe/search/pdb/1GV4), [1M6I](https://www.ebi.ac.uk/pdbe/search/pdb/1M6I), [3PHC](https://www.ebi.ac.uk/pdbe/search/pdb/3PHC)</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a>, <a href="/wiki/ms" style="color:#ef9a9a">Ms</a>, <a href="/wiki/neurodegeneration" style="color:#ef9a9a">Neurodegeneration</a>, <a href="/wiki/neuroinflammation" style="color:#ef9a9a">Neuroinflammation</a>, <a href="/wiki/parkinson" style="color:#ef9a9a">Parkinson</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">22 edges</a></td>
</tr>
</table>
</div>

Apoptosis-Inducing Factor (AIF) is a crucial flavoprotein that plays dual roles in both normal mitochondrial function and programmed cell death. As a key mediator of caspase-independent apoptosis, AIF translocates from mitochondria to the nucleus upon apoptotic stimuli, where it triggers large-scale DNA fragmentation and chromatin condensation.

Structure

The AIF protein contains several distinct structural domains:

• N-terminal mitochondrial targeting sequence (MTS): First 50 amino acids form an amphipathic helix that directs mitochondrial import
• FAD-binding domain: Comprises residues 150-400 and binds FAD cofactor essential for NADH oxidase activity
• DNA-binding domain: C-terminal region (residues 400-613) can bind DNA in the nucleus during apoptosis
• Proline-rich region: Contains SH3-binding motifs for protein-protein interactions

Normal Function

In healthy cells, AIF performs essential mitochondrial functions:

Role in Disease

Charcot-Marie-Tooth Disease Type 4 (CMTX4)

Recessive mutations in AIFM1 cause X-linked Charcot-Marie-Tooth disease type 4, characterized by peripheral neuropathy, axonal degeneration, and sometimes cognitive impairment^[2].

Combined Oxidative Phosphorylation Deficiency (COXPD)

Loss-of-function mutations lead to severe multisystem disorders affecting brain development, causing encephalomyopathy, lactic acidosis, and early-onset neurodegeneration^[3].

Alzheimer's Disease

AIF is sequestered in the cytoplasm in AD brains and translocates to the nucleus in response to [amyloid-beta](/proteins/amyloid-beta) toxicity, contributing to neuronal DNA damage and death^[4].

Parkinson's Disease

Mitochondrial dysfunction in PD involves impaired AIF function, and PARP-1 activation leads to AIF-mediated cell death (parthanatos)^[5].

ALS

AIF translocation from mitochondria to nucleus is observed in ALS motor [neurons](/entities/neurons), contributing to progressive neurotoxicity.

Therapeutic Targeting

Current therapeutic approaches targeting AIF pathway:

• PARP Inhibitors: Prevent AIF translocation by blocking PARP-1 hyperactivation
• AIF Modulators: Small molecules that stabilize mitochondrial AIF or prevent its release
• Gene Therapy: AAV-based delivery of wild-type AIF for loss-of-function mutations (experimental)

Interactions

AIF interacts with several key proteins:

• Complex I subunits: NDUFS1, NDUFS2, NDUFV1 - for respiratory chain assembly
• Hsp90: Chaperone that helps maintain AIF stability
• PARP-1: DNA repair enzyme that, when overactivated, triggers AIF release
• CypD: Cyclophilin D - involved in mitochondrial permeability transition
• Bax/Bak: Pro-apoptotic Bcl-2 proteins that facilitate AIF release

See Also

• [AIFM1 Gene](/genes/aifm1)
• [Apoptosis Pathways](/mechanisms/apoptosis-pathways)
• [Mitochondrial Dysfunction in Neurodegeneration](/mechanisms/mitochondrial-dysfunction)
• [Complex I Deficiency](/mechanisms/complex-i-deficiency)
• [PARP-1 and Neurodegeneration](/proteins/parp1-protein)

Background

The study of Aifm1 Protein — Apoptosis Inducing Factor 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.

External Links

• [PubMed](https://pubmed.ncbi.nlm.nih.gov/) - Biomedical literature
• [Alzheimer's Disease Neuroimaging Initiative](https://adni.loni.usc.edu/) - Research data
• [Allen Brain Atlas](https://brain-map.org/) - Brain gene expression data

References

PMID: 15258280(https://pubmed.ncbi.nlm.nih.gov/15258280/) PMID: 36740475(https://pubmed.ncbi.nlm.nih.gov/36740475/) PMID: 20018596(https://pubmed.ncbi.nlm.nih.gov/20018596/) PMID: 33974291(https://pubmed.ncbi.nlm.nih.gov/33974291/) PMID: 35617865(https://pubmed.ncbi.nlm.nih.gov/35617865/)