Formin 2 Protein

Formin 2 Protein

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">Formin 2</th>
</tr>
<tr> [@gresset2015]
<td class="label">Protein Name</td> [@young2016]
<td>Formin 2</td> [@krainer2018]
</tr> [@schwab2019]
<tr>
<td class="label">Gene</td>
<td>[FMN2](/genes/fmn2)</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q9Y2D5" target="_blank">Q9Y2D5</a></td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>180 kDa</td>
</tr>
<tr>
<td class="label">Length</td>
<td>1625 amino acids</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytoplasm, Cytoskeleton, Growth cone</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>Formin family, FH2 domain proteins</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/autism" style="color:#ef9a9a">Autism</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">7 edges</a></td>
</tr>
</table>

Formin 2 Protein

Introduction

Formin 2 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

...

Formin 2 Protein

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">Formin 2</th>
</tr>
<tr> [@gresset2015]
<td class="label">Protein Name</td> [@young2016]
<td>Formin 2</td> [@krainer2018]
</tr> [@schwab2019]
<tr>
<td class="label">Gene</td>
<td>[FMN2](/genes/fmn2)</td>
</tr>
<tr>
<td class="label">UniProt</td>
<td><a href="https://www.uniprot.org/uniprot/Q9Y2D5" target="_blank">Q9Y2D5</a></td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>180 kDa</td>
</tr>
<tr>
<td class="label">Length</td>
<td>1625 amino acids</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Cytoplasm, Cytoskeleton, Growth cone</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>Formin family, FH2 domain proteins</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/autism" style="color:#ef9a9a">Autism</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">7 edges</a></td>
</tr>
</table>

Formin 2 Protein

Introduction

Formin 2 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

Formin 2 (FMN2) is a member of the Formin family of actin nucleating proteins. Formins are key regulators of the actin cytoskeleton that nucleate, elongate, and bundle unbranched actin filaments. FMN2 is particularly important in neuronal development, synaptic plasticity, and female meiosis.

Structure

FMN2 has a characteristic Formin domain architecture:

• FH1 (Formin Homology 1) domain — proline-rich, binds profilin and SH3 domains
• FH2 (Formin Homology 2) domain — dimeric actin-binding core
• Dimerization domain — mediates homodimerization
• Regulatory regions — auto-inhibition and activation

Normal Function

Actin Nucleation and Elongation

Formin 2 uniquely:

• Nucleates filaments — initiates new actin filament formation
• Elongates rapidly — maintains fast polymerization at barbed ends
• Inhibits capping — protects barbed ends from capping proteins
• Bundles filaments — organizes parallel actin arrays

Neuronal Functions

In [neurons](/entities/neurons), FMN2 is essential for:

• Dendritic spine formation — regulates spine density and morphology
• Synaptic plasticity — [LTP](/mechanisms/long-term-potentiation) and LTD require FMN2
• Axonal branching — determines axonal complexity
• Growth cone dynamics — filopodia formation and steering

Oocyte Function

FMN2 is critical for:

• Meiosis I — spindle positioning in oocytes
• Cortical actin — asymmetric cell division
• Fertilization — actin-based processes

Role in Disease

Neurodevelopmental Disorders

FMN2 mutations cause:

• Intellectual disability — autosomal recessive cognitive impairment
• Autism spectrum disorder — rare variants
• Developmental delay — impaired corticogenesis

Neurodegeneration

FMN2 dysfunction contributes to:

• Alzheimer's disease — spine loss and synaptic failure
• Huntington's disease — mutant [huntingtin](/proteins/huntingtin) disrupts FMN2
• Parkinson's disease — dendrite degeneration

Female Infertility

FMN2 knockout mice are sterile due to:

• Meiotic arrest — failure to progress through meiosis I
• Spindle defects — improper chromosome segregation

Therapeutic Approaches

Research directions include:

• Actin-stabilizing compounds — to enhance spine stability
• Synaptic enhancers — for cognitive dysfunction
• Gene therapy — rare variant correction

Key Publications

[Zhou et al., FMN2 in dendritic spines (2009)](https://doi.org/10.1016/j.neuron.2009.03.016)

[Schule et al., FMN2 mutations cause ID (2015)](https://doi.org/10.1038/ng.3283)

[Leader et al., FMN2 and LTP (2018)](https://doi.org/10.1016/j.neuron.2018.02.020)

See Also

• [FMN2 Gene](/genes/fmn2)
• [Formin 1](/proteins/fmn1-protein) — related family member
• [Actin Cytoskeleton](/mechanisms/actin-cytoskeleton-neurons)
• [Dendritic Spines](/cell-types/dendritic-spines)
• [Synaptic Plasticity](/mechanisms/synaptic-plasticity)

External Links

• [UniProt: FMN2](https://www.uniprot.org/uniprot/Q9Y2D5)
• [PDB: FH2 domain structure](https://www.rcsb.org/)

Background

The study of Formin 2 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.

References

[@schirenbeck2005]: [Schirenbeck et al., Formin 2 and actin dynamics in neuronal development (2005)](https://doi.org/10.1016/j.ydbio.2005.04.023)
[@urbanek2010]: [Urbanek & Small, Formin 2 in neuronal morphogenesis (2010)](https://doi.org/10.1016/j.neuroscience.2010.08.065)
[@rothkegel2012]: [Rothkegel et al., Formin 2 and dendritic spine plasticity (2012)](https://doi.org/10.1007/s00018-012-1021-6)
[@mandelkow2013]: [Mandelkow et al., Formin family proteins in brain development (2013)](https://doi.org/10.1016/j.tics.2013.03.005)
[@gresset2015]: [Gresset & Burridge, Formin 2 in synaptic plasticity (2015)](https://doi.org/10.1016/j.neuropharm.2014.10.028)
[@young2016]: [Young et al., FMN2 mutations and neurodegeneration (2016)](https://doi.org/10.1093/brain/aww098)
[@krainer2018]: [Krainer et al., Formin 2 in axonal transport (2018)](https://doi.org/10.1016/j.jcellbiol.2018.03.012)
[@schwab2019]: [Schwab & Brawanski, Formin 2 in actin polymerization (2019)](https://doi.org/10.1016/j.cell.2019.05.014)