LRP3 Protein

LRP3 Protein

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">LRP3 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Low-Density Lipoprotein Receptor-Related Protein 3</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>LRP3</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>O75174</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000141548</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~250 kDa</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>2,325 amino acids</td>
</tr>
<tr>
<td class="label">Cellular Location</td>
<td>Plasma membrane, endosomes</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>Brain ([cortex](/brain-regions/cortex), hippocampus), heart, skeletal muscle</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>LDLR receptor family</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Lrp3 Protein 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.

Introduction

LRP3 Protein

Overview

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">LRP3 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Low-Density Lipoprotein Receptor-Related Protein 3</td>
</tr>
<tr>
<td class="label">Gene Symbol</td>
<td>LRP3</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>O75174</td>
</tr>
<tr>
<td class="label">Ensembl ID</td>
<td>ENSG00000141548</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>~250 kDa</td>
</tr>
<tr>
<td class="label">Protein Length</td>
<td>2,325 amino acids</td>
</tr>
<tr>
<td class="label">Cellular Location</td>
<td>Plasma membrane, endosomes</td>
</tr>
<tr>
<td class="label">Tissue Expression</td>
<td>Brain ([cortex](/brain-regions/cortex), hippocampus), heart, skeletal muscle</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>LDLR receptor family</td>
</tr>
<tr>
<td class="label">KG Connections</td>
<td><a href="/atlas" style="color:#4fc3f7">1 edges</a></td>
</tr>
</table>

Lrp3 Protein 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.

Introduction

LRP3 (Low-Density Lipoprotein Receptor-Related Protein 3) is a member of the LDLR (Low-Density Lipoprotein Receptor) superfamily. LRP3 is a large transmembrane receptor involved in lipoprotein metabolism, cellular signaling, and neuronal function. While less characterized than other LRP family members ([LRP1](/proteins/lrp1), LRP2/Megalin, LRP5, LRP6), LRP3 is expressed in the brain and has been implicated in Alzheimer's Disease (AD) and other neurodegenerative conditions. The protein is approximately 2,325 amino acids in length with a molecular weight of ~250 kDa. [@herz2009]

Protein Information

Protein Structure

LRP3 contains characteristic LDLR family features:

• N-terminal ligand-binding repeats (LA modules): Multiple complement-type repeats for ligand binding
• Epidermal growth factor (EGF) precursor homology domain: Contains EGF-like repeats and β-propeller domains
• Transmembrane domain: Single pass membrane-spanning region
• Cytoplasmic tail: Contains NPXY motifs for endocytosis and signaling

Normal Function

Lipoprotein Metabolism

• Binds and internalizes lipoproteins
• Participates in cholesterol homeostasis
• May mediate lipid delivery to [neurons](/entities/neurons)

Neuronal Functions

• Synaptic function: Expressed at synapses, may regulate synaptic plasticity
• Axonal transport: Potentially involved in transport of cargoes
• Neuronal signaling: May participate in Reelin and other signaling pathways

Cellular Processes

• Endocytosis: Mediates receptor-mediated endocytosis
• Cholesterol homeostasis: Links lipid metabolism to neuronal function
• Cell survival: May provide trophic support

Role in Neurodegeneration

Alzheimer's Disease

LRP3 involvement in AD is emerging:

• Altered LRP3 expression in AD brain tissue
• [Amyloid precursor protein](/entities/app-protein) (APP) processing: May influence APP trafficking
• Cholesterol metabolism: Links to lipid raft function and [Aβ](/proteins/amyloid-beta) production
• Synaptic dysfunction: May contribute to synaptic loss
• Genetic variants may modify AD risk

Other Neurodegenerative Diseases

• Potential role in lipid homeostasis in various neurodegenerative conditions
• May be involved in Parkinson's Disease pathogenesis
• Altered expression in some tauopathies

Interaction Network

LRP3 interacts with:

• [ApoE](/proteins/apoe): Lipoprotein ligand
• LDL: Primary ligand
• RAP/DAB2: Chaperone and adaptor proteins
• PSD-95: Synaptic scaffolding protein (potential)
• APP: Amyloid precursor protein (potential)

Therapeutic Implications

• Lipid-lowering strategies: May influence LRP3 function
• Modulation of lipid rafts: Aβ production and trafficking
• Gene therapy approaches: Potential for future intervention

See Also

• [LRP3 Gene](/genes/lrp3)
• [LRP1 Protein](/proteins/lrp1-protein)
• [LRP2 Protein](/proteins/lrp2-protein)
• [LDLR Family](/mechanisms/ldlr-family)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Lipid Metabolism](/mechanisms/lipid-metabolism)mechanisms/sphingolipid-metabolism)
• [Cholesterol and Neurodegeneration](/mechanisms/cholesterol-neurodegeneration)

Overview

Lrp3 Protein 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 Lrp3 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

• [UniProt: LRP3](https://www.uniprot.org/uniprot/O75174)
• [Ensembl: LRP3](https://www.ensembl.org/Homo_sapiens/Gene/Summary?g=ENSG00000141548)
• [GeneCards: LRP3](https://www.genecards.org/cgi-bin/carddisp.pl?gene=LRP3)

References