FIS1 Protein

FIS1 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">FIS1 Protein</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>FIS1</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Fission 1 Protein</td>
</tr>
<tr>
<td class="label">Alternative Names</td>
<td>FIS1, TTC4</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9NY3I</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~17 kDa</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>FIS1 family</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Mitochondrial outer membrane</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><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/atherosclerosis" style="color:#ef9a9a">Atherosclerosis</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">279 edges</a></td>
</tr>
</table>

Fis1 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.

Overview

FIS1 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">FIS1 Protein</th>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>FIS1</td>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Fission 1 Protein</td>
</tr>
<tr>
<td class="label">Alternative Names</td>
<td>FIS1, TTC4</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>Q9NY3I</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~17 kDa</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>FIS1 family</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Mitochondrial outer membrane</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><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/atherosclerosis" style="color:#ef9a9a">Atherosclerosis</a>, <a href="/wiki/cancer" style="color:#ef9a9a">Cancer</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">279 edges</a></td>
</tr>
</table>

Fis1 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.

Overview

FIS1 (Fission 1 Protein) is a small mitochondrial outer membrane protein that plays a critical role in mitochondrial fission. FIS1 recruits the dynamin-related protein [Drp1](/proteins/drp1-protein) to the mitochondrial surface to mediate membrane scission. It is essential for mitochondrial quality control, cell survival, and is implicated in various neurodegenerative diseases where mitochondrial dynamics are disrupted [@james2003][@stoops2008].

Protein Information

Structure

FIS1 has a simple structure:

FIS1 forms homodimers and higher-order oligomers to function [@liu2009].

Normal Function

Mitochondrial Fission

FIS1 mediates fission:

• Drp1 recruitment — Adaptor protein for Drp1
• Fission site selection — Marks fission competent sites
• OMM constriction — Initiates membrane弯曲
• ERGIC interaction — Connected to ER-mitochondria contacts

Cellular Functions

FIS1 regulates:

• Mitochondrial quality control — Enables mitophagy
• [Apoptosis](/entities/apoptosis) — FIS1 fragmentation during intrinsic apoptosis
• Cell cycle — Mitochondrial distribution during division
• Metabolic adaptation — Shapes mitochondrial network

Neuronal Functions

In [neurons](/entities/neurons):

• Synaptic mitochondria — Maintains synaptic mitochondrial pool
• Axonal transport — Mitochondrial distribution in axons
• Dendritic branching — Regulates mitochondrial morphology
• Neuronal survival — Balance of fission/fusion critical [@cheng2010][@liu2012]

Role in Neurodegeneration

Alzheimer's Disease

FIS1 is altered in AD:

• Hyperfission — Increased FIS1 leads to excessive fragmentation
• Mitochondrial dysfunction — Impaired mitochondrial quality
• Synaptic loss — Defective synaptic mitochondria
• Neuronal death — Contributes to neurodegeneration

Parkinson's Disease

• Mitochondrial fragmentation — FIS1 increased in PD
• PINK1/Parkin pathway — Works with mitophagy machinery
• Dopaminergic vulnerability — Affects SNc neurons

Amyotrophic Lateral SALS

• Motor neuron stress — FIS1 dysregulated in ALS
• Mitochondrial quality control — Impaired mitophagy

Huntington's Disease

• Mitochondrial dysfunction — FIS1 alterations in HD
• Energy deficit — Contributes to neuronal dysfunction

Therapeutic Implications

Targeting FIS1:

• Fission inhibitors — Reduce pathological fission
• Modulation of Drp1 — Downstream of FIS1
• Mitochondrial protectants — Broader approaches

Key Publications

See Also

• [FIS1 Gene](/genes/fis1)
• [DRP1 Gene](/genes/dnm1l)
• [Mitochondrial Dynamics](/mechanisms/mitochondrial-dynamics)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)

Background

The study of Fis1 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.

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