CNR1 Protein

CNR1 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">CNR1 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Cannabinoid Receptor 1 (CB1)</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>CNR1</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P21554</td>
</tr>
<tr>
<td class="label">PDB ID</td>
<td>5TGZ, 6N4B</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>53 kDa (un-glycosylated)</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Plasma membrane, intracellular vesicles</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>Class A G protein-coupled receptors (GPCR)</td>
</tr>
<tr>
<td class="label">Drug</td>
<td>Type</td>
</tr>
<tr>
<td class="label">Dronabinol</td>
<td>Full agonist</td>
</tr>
<tr>
<td class="label">Nabilone</td>
<td>Synthetic agonist</td>
</tr>
<tr>
<td class="label">Drug</td>
<td>Type</td>
</tr>
<tr>
<td class="label">Rimonabant</td>
<td>CB1 antagonist</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/amyotrophic-lateral-sclerosis" style="color:#ef9a9a">Amyotrophic Lateral Sclerosis</a>, <a href="/wiki/anxiety" style="color:#ef9a9a">Anxiety</a>, <a href="/wiki/autism" style="color:#ef9a9a">Autism</a></td>
</tr>
<tr>

CNR1 Protein

Introduction

<table class="infobox infobox-protein">
<tr>
<th class="infobox-header" colspan="2">CNR1 Protein</th>
</tr>
<tr>
<td class="label">Protein Name</td>
<td>Cannabinoid Receptor 1 (CB1)</td>
</tr>
<tr>
<td class="label">Gene</td>
<td>CNR1</td>
</tr>
<tr>
<td class="label">UniProt ID</td>
<td>P21554</td>
</tr>
<tr>
<td class="label">PDB ID</td>
<td>5TGZ, 6N4B</td>
</tr>
<tr>
<td class="label">Molecular Weight</td>
<td>53 kDa (un-glycosylated)</td>
</tr>
<tr>
<td class="label">Subcellular Localization</td>
<td>Plasma membrane, intracellular vesicles</td>
</tr>
<tr>
<td class="label">Protein Family</td>
<td>Class A G protein-coupled receptors (GPCR)</td>
</tr>
<tr>
<td class="label">Drug</td>
<td>Type</td>
</tr>
<tr>
<td class="label">Dronabinol</td>
<td>Full agonist</td>
</tr>
<tr>
<td class="label">Nabilone</td>
<td>Synthetic agonist</td>
</tr>
<tr>
<td class="label">Drug</td>
<td>Type</td>
</tr>
<tr>
<td class="label">Rimonabant</td>
<td>CB1 antagonist</td>
</tr>
<tr>
<td class="label">Associated Diseases</td>
<td><a href="/wiki/als" style="color:#ef9a9a">Als</a>, <a href="/wiki/alzheimer" style="color:#ef9a9a">Alzheimer</a>, <a href="/wiki/amyotrophic-lateral-sclerosis" style="color:#ef9a9a">Amyotrophic Lateral Sclerosis</a>, <a href="/wiki/anxiety" style="color:#ef9a9a">Anxiety</a>, <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">99 edges</a></td>
</tr>
</table>

Cnr1 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

Structure

The CB1 cannabinoid receptor is a typical Class A GPCR with:

• N-terminal extracellular domain: Contains glycosylation sites and ligand-binding region
• Seven transmembrane helices: Form the classic GPCR bundle
• Intracellular loops: Couple to G proteins (Gi/o)
• C-terminal intracellular tail: Contains palmitoylation site and trafficking motifs

Ligand Binding

• Binding pocket located within the transmembrane bundle
• Binds endogenous cannabinoids (anandamide, 2-AG)
• Binds plant-derived cannabinoids (THC)
• Allosteric binding sites identified

Normal Function

Signaling Pathways

• Gi/o protein coupling: Inhibits adenylyl cyclase, reduces cAMP
• Ion channel modulation: Activates inwardly rectifying K+ channels
• ERK/MAPK pathway: Regulates gene expression
• β-arrestin signaling: Mediates some downstream effects

Physiological Roles

• Modulates neurotransmitter release (glutamate, GABA, dopamine)
• Regulates appetite and energy metabolism
• Involved in memory and learning processes
• Controls pain perception and emotional responses
• Regulates immune function

Role in Disease

Addiction

• Cannabis use disorder: Genetic variants affect addiction risk
• Reward processing: Altered endocannabinoid signaling in addiction
• Therapeutic target: CB1 antagonists (historical: rimonabant)

Neurological Disorders

• Schizophrenia: Altered CB1 signaling contributes to psychosis
• Alzheimer's Disease: Neuroprotective potential of CB1 modulation
• Parkinson's Disease: CB1 changes in basal ganglia

Movement Disorders

• Huntington's Disease: Progressive CB1 receptor loss
• Multiple System Atrophy: Dysregulated endocannabinoid signaling

Therapeutic Targeting

Agonists

Antagonists

Drug Development

• Peripherally-restricted CB1 antagonists
• Allosteric modulators
• FAAH inhibitors (increase anandamide)

Key Publications

See Also

• [CNR1 Gene](/proteins/cnr1-protein)
• [Endocannabinoid System](/mechanisms/endocannabinoid-system)
• [Parkinson's Disease](/diseases/parkinsons-disease)
• [Alzheimer's Disease](/diseases/alzheimers-disease)
• [Cannabis Use Disorder](/diseases/cannabis-use-disorder)

External Links

• [UniProt: CNR1](https://www.uniprot.org/uniprot/P21554)
• [PDB: 5TGZ](https://www.rcsb.org/structure/5TGZ)
• [IUPHAR: CB1](https://www.guidetopharmacology.org/GRAC/ObjectDisplayForward?objectId=56)

Background

The study of Cnr1 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