Neurogranin (RC3)

Neurogranin (RC3)

Overview

Neurogranin (Rc3) plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

{{#vardefine:wikiId|}}
{{#vardefine:pageId|2218}}

<div class="infobox infox-protein">
<div class="infobox-header">Neurogranin (RC3)</div>
<div class="infobox-image">

Neurogranin (RC3)

Overview

Neurogranin (Rc3) plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

{{#vardefine:wikiId|}}
{{#vardefine:pageId|2218}}

<div class="infobox infox-protein">
<div class="infobox-header">Neurogranin (RC3)</div>
<div class="infobox-image">

</div>
<table class="infobox-table">
<tr><th>Protein Name</th><td>Neurogranin</td></tr>
<tr><th>Gene Symbol</th><td>[NRGN](/genes/nrn1)</td></tr>
<tr><th>UniProt ID</th><td><a href="https://www.uniprot.org/uniprot/P47915" target="_blank">P47915</a></td></tr>
<tr><th>PDB Structures</th><td>1DKK, 1RG4, 2M55</td></tr>
<tr><th>Molecular Weight</th><td>~7.5 kDa</td></tr>
<tr><th>Subcellular Localization</th><td>Postsynaptic dendrites, [dendritic spines](/cell-types/dendritic-spines)</td></tr>
<tr><th>Protein Family</th><td>Calmodulin-binding protein family</td></tr>
<tr><th>Aliases</th><td>RC3, RC3.1, Ng, ICAP-1, H3</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/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/inflammation" style="color:#ef9a9a">Inflammation</a>, <a href="/wiki/neuroinflammation" style="color:#ef9a9a">Neuroinflammation</a></td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">18 edges</a></td>
</tr>
</table>
</div>

Introduction

Neurogranin (RC3) is a postsynaptic calmodulin-binding protein enriched in [dendritic spines](/mechanisms/dendritic-spines) of forebrain [neurons](/entities/neurons). It plays a critical role in synaptic plasticity, learning, and memory by regulating calmodulin availability and downstream signaling. Neurogranin has emerged as a promising biomarker for synaptic dysfunction in Alzheimer's disease (AD), Parkinson's disease (PD), and other neurodegenerative disorders.

Structure

Neurogranin is a small, intrinsically disordered protein characterized by:

• N-terminal Region: Contains the RC3/CAPND domain
• Central Region: Serine-rich domain with multiple phosphorylation sites
• C-terminal Domain: IQ motif for calmodulin binding

• Calmodulin-binding Domain (IQ motif): Sequence IQVTFVF
• Phosphorylation Sites: Multiple serine residues (Ser-4, Ser-5, Ser-8, Ser-10)
• Target Protein Interaction Sites: Binds to AKAP79/150

Normal Function

Neurogranin is essential for synaptic plasticity through:

Neurogranin expression is brain-specific, with highest levels in the [hippocampus](/brain-regions/hippocampus), [cortex](/brain-regions/cortex), and striatum.

Role in Disease

Alzheimer's Disease

Neurogranin is deeply involved in AD pathogenesis:

Parkinson's Disease

In PD, neurogranin:

• Declines in the substantia nigra and CSF
• Correlates with dopaminergic neuron loss
• May reflect synaptic dysfunction in PD cognitive impairment
• Associates with Lewy body pathology

Other Neurological Disorders

• Schizophrenia: Altered neurogranin expression in prefrontal cortex
• Down Syndrome: Elevated neurogranin in early life
• Traumatic Brain Injury: Fluid biomarker for synaptic damage
• Multiple Sclerosis: CSF neurogranin reflects axonal injury

Signaling Pathways

Neurogranin integrates multiple synaptic signaling cascades:

Biomarker Potential

Neurogranin is one of the most promising synaptic biomarkers:

| Marker | Fluid | Change in AD | Clinical Utility |
|--------|-------|--------------|------------------|
| Neurogranin | CSF | ↑ | Diagnostic, progression |
| Neurogranin | Blood (SiMoA) | ↑ | Screening, monitoring |
| Neurogranin fragments | CSF | ↑ | Specificity |

Clinical applications:

• Diagnostic: Differentiates AD from other dementias
• Progression: Tracks cognitive decline
• Treatment Response: Monitors drug efficacy
• Prodromal Detection: Detects synaptic dysfunction early

Therapeutic Strategies

Targeting neurogranin pathways:

| Approach | Strategy | Status | Notes |
|----------|----------|--------|-------|
| Neurogranin peptides | Mimetic compounds | Research | Restore synaptic function |
| PKC modulators | Small molecules | Research | Enhance phosphorylation |
| Calmodulin stabilizers | Research compounds | Preclinical | Improve synaptic plasticity |
| Gene therapy | NRGN expression | Research | Viral vector approaches |

Key Publications

Cross-Links

• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Synaptic Dysfunction Pathway](/mechanisms/synaptic-dysfunction-pathway)
• ["NRGN Gene"](/proteins/nrgn-protein)
• ["Calmodulin"](/calm1-—-calmodulin-1)
• ["CREB"](/proteins/creb1-protein)
• [Neurogranin (Biomarker)](/biomarkers/neurogranin)

Overview

Neurogranin (Rc3) plays an important role in the study of neurodegenerative diseases. This page provides comprehensive information about this topic, including its mechanisms, significance in disease processes, and therapeutic implications.

Background

The study of Neurogranin (Rc3) 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.

Brain Atlas Resources

• Allen Human Brain Atlas: [NEUROGRANIN (RC3) expression](https://human.brain-map.org/microarray/search/show?search_term=NEUROGRANIN (RC3))
• Allen Cell Type Atlas: [NEUROGRANIN (RC3) cell type expression](https://celltypes.brain-map.org/)
• BrainSpan: [NEUROGRANIN (RC3) developmental expression](https://brainspan.org/)

See Also

• [Long-Term Potentiation](/mechanisms/synaptic-dysfunction)
• [Amyloid Cascade](/mechanisms/amyloid-cascade)
• [Tau Pathology](/mechanisms/tau-pathology)

External Links

• [UniProt: Neurogranin](https://www.uniprot.org/uniprot/P47915)
• [Neurogranin in AD - Reviews](https://pubmed.ncbi.nlm.nih.gov/)
• [Alzheimer's Neurogranin Initiative](https://pubmed.ncbi.nlm.nih.gov/)

References

Pathway Diagram

The following diagram shows the key molecular relationships involving Neurogranin (RC3) discovered through SciDEX knowledge graph analysis: