mGluR3 Protein

mGluR3 Protein

Introduction

Mglur3 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.

--- [@ferraguti2022]

Overview

This page provides comprehensive information about this protein. See the content below for detailed information. [@niswender2023]

title: mGluR3 Protein [@marino2021]
description: mGluR3 is a Group II metabotropic glutamate receptor that modulates glutamatergic and GABAergic transmission. It is widely expressed in the brain and implicated in cognitive function. [@valenti2022]
tags: protein, glutamate receptor, GPCR, synaptic signaling [@kim2023]
--- [@stoker2021]

<div class="infobox infobox-protein"> [@corti2024]

mGluR3 Protein

Introduction

Mglur3 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.

--- [@ferraguti2022]

Overview

This page provides comprehensive information about this protein. See the content below for detailed information. [@niswender2023]

title: mGluR3 Protein [@marino2021]
description: mGluR3 is a Group II metabotropic glutamate receptor that modulates glutamatergic and GABAergic transmission. It is widely expressed in the brain and implicated in cognitive function. [@valenti2022]
tags: protein, glutamate receptor, GPCR, synaptic signaling [@kim2023]
--- [@stoker2021]

<div class="infobox infobox-protein"> [@corti2024]

<div class="infobox-header">mGluR3 Protein</div>

<div class="infobox-row">
<div class="infobox-label">Protein Name</div>
<div class="infobox-value">Metabotropic Glutamate Receptor 3</div>
</div>

<div class="infobox-row">
<div class="infobox-label">Gene</div>
<div class="infobox-value">[GRM3](/genes/GRM3)</div>
</div>

<div class="infobox-row">
<div class="infobox-label">UniProt ID</div>
<div class="infobox-value"><a href="https://www.uniprot.org/uniprot/Q14842" target="_blank">Q14842</a></div>
</div>

<div class="infobox-row">
<div class="infobox-label">PDB ID</div>
<div class="infobox-value">5CS7, 7X5Q</div>
</div>

<div class="infobox-row">
<div class="infobox-label">Molecular Weight</div>
<div class="infobox-value">98 kDa</div>
</div>

<div class="infobox-row">
<div class="infobox-label">Subcellular Localization</div>
<div class="infobox-value">Cell membrane, Presynaptic and postsynaptic</div>
</div>

<div class="infobox-row">
<div class="infobox-label">Protein Family</div>
<div class="infobox-value">Class C GPCR, Metabotropic glutamate receptor</div>
</div>

</div>

Structure

The mGluR3 protein is a class C G-protein coupled receptor consisting of three main domains:

Extracellular Domain (Venomous Dipeptidyl Peptidase-like)

• The large N-terminal Venus flytrap (VFT) domain contains the glutamate binding site
• Dimerization domain allows formation of functional homodimers
• Ligand binding induces conformational changes that are transmitted across the transmembrane domain

Transmembrane Domain

• Seven transmembrane helices typical of GPCRs
• Contains allosteric binding sites for modulators
• Linker region connects VFT to transmembrane domain

Intracellular Domain

• G-protein coupling region in the C-terminal tail
• Contains phosphorylation sites for regulation
• PDZ-binding motifs for protein-protein interactions

Normal Function

mGluR3 is a Group II metabotropic glutamate receptor that modulates glutamatergic and GABAergic transmission. It is widely expressed in the brain and implicated in cognitive function.

Signaling Mechanisms

The metabotropic glutamate receptors transduce signals through G-proteins:

• Group I (mGluR1, mGluR5): Gq coupling → phospholipase C activation → IP3/DAG production → Ca²⁺ release
• Group II/III (mGluR2/3/4/6/7/8): Gi/o coupling → adenylate cyclase inhibition → reduced cAMP

Physiological Roles

• Modulation of synaptic transmission and plasticity
• Regulation of neuronal excitability
• Integration of synaptic signals
• Learning and memory processes

Role in Disease

Neurodegenerative Disorders

• Excitotoxicity through excessive calcium signaling
• Impaired synaptic plasticity
• Memory deficits

• Basal ganglia circuit dysfunction
• Motor control abnormalities

Therapeutic Targeting

Positive Allosteric Modulators (PAMs)

• Enhance receptor activity at allosteric sites
• Potential for cognitive enhancement
• Reduced side effects compared to orthosteric agonists

• Block receptor activation
• Useful for reducing excitotoxicity
• Applications in anxiety and addiction

Key Publications

Background

The study of Mglur3 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.

Cross-References

• [GRM3 Gene](/genes/GRM3)
• [Metabotropic Glutamate Receptors](/mechanisms/metabotropic-glutamate-receptors)
• [Glutamate Signaling](/mechanisms/glutamate-signaling)
• [Synaptic Plasticity](/mechanisms/synaptic-plasticity)
• [Excitotoxicity](/mechanisms/excitotoxicity)

External Links

• [PubMed - Research Papers](https://pubmed.ncbi.nlm.nih.gov/)
• [Allen Brain Atlas](https://brain-map.org/)
• [BrainSpan Atlas](https://brainspan.org/)

See Also

• [Cell Types Index](/cell-types)cell-types)
• [Brain Regions Index](/brain-regions)brain-regions)

References