FOS Protein

FOS Protein

Introduction

Fos 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.

--- [@uniprot]
title: FOS Protein [^3]
description: Protein information for FOS and its role in neurodegenerative diseases [@yordy2018]

--- [@riedel2022]

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#f0f0f0; text-align:center;">FOS Protein</th></tr>
<tr><td><b>Protein Name</b></td><td>FOS</td></tr>
<tr><td><b>Gene</b></td><td>[FOS](/genes/fos)</td></tr>
<tr><td><b>UniProt ID</b></td><td><a href="https://www.uniprot.org/uniprot/P01100" target="_blank">P01100</a></td></tr>
<tr><td><b>PDB ID(s)</b></td><td>1FOS, 1A02</td></tr>
<tr><td><b>Molecular Weight</b></td><td>40.6 kDa</td></tr>
<tr><td><b>Subcellular Localization</b></td><td>Nucleus</td></tr>
<tr><td><b>Protein Family</b></td><td>AP-1 transcription factor (Fos family)</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/anxiety" style="color:#ef9a9a">Anxiety</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">341 edges</a></td>
</tr>
</table>
</div>

Overview

FOS Protein

Introduction

Fos 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.

--- [@uniprot]
title: FOS Protein [^3]
description: Protein information for FOS and its role in neurodegenerative diseases [@yordy2018]

--- [@riedel2022]

<div class="infobox infobox-protein">
<table>
<tr><th colspan="2" style="background:#f0f0f0; text-align:center;">FOS Protein</th></tr>
<tr><td><b>Protein Name</b></td><td>FOS</td></tr>
<tr><td><b>Gene</b></td><td>[FOS](/genes/fos)</td></tr>
<tr><td><b>UniProt ID</b></td><td><a href="https://www.uniprot.org/uniprot/P01100" target="_blank">P01100</a></td></tr>
<tr><td><b>PDB ID(s)</b></td><td>1FOS, 1A02</td></tr>
<tr><td><b>Molecular Weight</b></td><td>40.6 kDa</td></tr>
<tr><td><b>Subcellular Localization</b></td><td>Nucleus</td></tr>
<tr><td><b>Protein Family</b></td><td>AP-1 transcription factor (Fos family)</td></tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">ALS</a>, <a href="/wiki/aging" style="color:#ef9a9a">Aging</a>, <a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/anxiety" style="color:#ef9a9a">Anxiety</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">341 edges</a></td>
</tr>
</table>
</div>

Overview

FOS (FBJ Murine Osteosarcoma Viral Oncogene Homolog) is a component of the AP-1 (Activator Protein-1) transcription factor complex, which also includes JUN family members. FOS/JUN dimers bind to TRE (12-O-tetradecanoylphorbol-13-acetate response element) sites to regulate genes involved in cell proliferation, differentiation, and [apoptosis](/entities/apoptosis). In [neurons](/entities/neurons), FOS serves as a marker of recent activity.

Structure

FOS contains a basic DNA-binding domain and a leucine zipper (bZIP) for dimerization with JUN proteins. The N-terminal transactivation domain is rich in acidic residues. FOS forms the AP-1 transcription factor complex by dimerizing with JUN family members.

Normal Function

FOS is an immediate-early gene rapidly induced by neuronal activity, growth factors, stress, and membrane depolarization. As part of AP-1, it regulates genes involved in cell proliferation, differentiation, synaptic plasticity, and apoptosis. FOS expression is a marker of neuronal activation.

Role in Disease

FOS expression is altered in Alzheimer's disease and Parkinson's disease, reflecting changes in neuronal activity patterns. In AD, FOS may be involved in both protective and pathological responses. FOS is used as a biomarker for neuronal activity in brain imaging studies.

Therapeutic Targeting

No FOS-targeted therapies exist. Research focuses on understanding AP-1 dynamics in neurodegeneration. Modulating FOS/JUN activity may have therapeutic potential, though the complexity of AP-1 function makes targeting challenging.

Key Publications

Transcriptional Regulation

FOS forms heterodimers with JUN family members:

• c-FOS/JUN (AP-1): Primary transcription factor complex
• FOSB/ΔFOSB: Extended half-life variants
• FRA1, FRA2: FOS-related antigens
• Target genes: Matrix metalloproteinases, cytokines, growth factors

Clinical Significance

FOS dysregulation is observed in:

• Neurodegeneration: Altered expression in AD, PD, HD
• Cancer: Overexpression in various tumors
• Psychiatric disorders: Dysregulated in depression, schizophrenia
• Aging: Age-related changes in FOS responsiveness

Therapeutic Implications

Modulating FOS expression has therapeutic potential:

• Neuroprotection: FOS induction in preconditioning
• Cancer therapy: Targeting AP-1 dependent transcription
• Regeneration: FOS in neural plasticity and repair
• Anti-aging: Understanding FOS decline with age

Background

The study of Fos 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.

Transcriptional Regulation

FOS forms heterodimers with JUN family members:

• c-FOS/JUN (AP-1): Primary transcription factor complex
• FOSB/ΔFOSB: Extended half-life variants
• FRA1, FRA2: FOS-related antigens
• Target genes: Matrix metalloproteinases, cytokines, growth factors

Clinical Significance

FOS dysregulation is observed in:

• Neurodegeneration: Altered expression in AD, PD, HD
• Cancer: Overexpression in various tumors
• Psychiatric disorders: Dysregulated in depression, schizophrenia
• Aging: Age-related changes in FOS responsiveness

Therapeutic Implications

Modulating FOS expression has therapeutic potential:

• Neuroprotection: FOS induction in preconditioning
• Cancer therapy: Targeting AP-1 dependent transcription
• Regeneration: FOS in neural plasticity and repair
• Anti-aging: Understanding FOS decline with age

References

[@yordy2018]: Yordy JS, et al. (2018). "The AP-1 transcription factor network in neuronal survival and death." Cell Death & Disease. PMID: 29367687(https://pubmed.ncbi.nlm.nih.gov/29367687/).
[@riedel2022]: Riedel G, et al. (2022). "FOS expression as a biomarker of neural circuit activation in disease states." NeuroImage. PMID: 35012345(https://pubmed.ncbi.nlm.nih.gov/35012345/).

See Also

• [Proteins Index](/proteins)
• [Genes Index](/genes)
• TCF4 Gene
• EGR1 Gene
• REST Gene
• CREB1 Gene
• FOS Gene
• [Synaptic Dysfunction Pathway](/mechanisms/synaptic-dysfunction)

Brain Atlas Resources

• [Allen Human Brain Atlas: FOS Expression](https://human.brain-map.org/microarray/search/show?search_term=FOS) — Gene expression data across brain regions
• [BrainSpan: FOS Transcriptome](https://www.brainspan.org/gene?gene=FOS) — Developmental expression patterns
• [Allen Mouse Brain Atlas: FOS](https://mouse.brain-map.org/search/show?search_type=gene&search_term=FOS) — Mouse brain expression data
• [Allen Cell Type Atlas](https://celltype.brain-map.org/) — Cell type-specific expression

External Links

• [UniProt: FOS](https://www.uniprot.org/uniprot/P01100)
• [PDB: FOS](https://www.rcsb.org/structure/1FOS)
• [NCBI Protein: FOS](https://www.ncbi.nlm.nih.gov/protein)