Target type: molecularfunction
A G protein-coupled receptor that is activated by trans-1-aminocyclopentane-1,3-dicarboxylic acid (t-ACPD) and inhibits adenylate cyclase activity. [GOC:dph]
Group II metabotropic glutamate receptors (mGluRs), specifically mGluR2 and mGluR3, are members of the G protein-coupled receptor (GPCR) superfamily. They are expressed in the central nervous system (CNS) and play crucial roles in synaptic plasticity, neuronal excitability, and various cognitive functions. Their primary function is to mediate the effects of glutamate, the primary excitatory neurotransmitter in the brain.
Upon glutamate binding, these receptors activate intracellular signaling pathways, primarily through coupling to Gi/o proteins. This activation leads to the inhibition of adenylyl cyclase, resulting in a decrease in cAMP levels. The reduction in cAMP subsequently inhibits the activity of protein kinase A (PKA).
Furthermore, Group II mGluRs activate a phospholipase C (PLC) pathway, leading to the production of inositol trisphosphate (IP3) and diacylglycerol (DAG). IP3 triggers the release of calcium from intracellular stores, while DAG activates protein kinase C (PKC).
The downstream effects of Group II mGluR activation are diverse and depend on the specific cell type and the context of activation. However, their overall function is generally inhibitory, modulating neuronal activity and synaptic transmission.
Here's a summary of the key molecular functions of Group II mGluRs:
- **Glutamate binding:** Initiates receptor activation.
- **Gi/o protein coupling:** Leads to the inhibition of adenylyl cyclase, reducing cAMP levels.
- **Inhibition of PKA:** Dampens PKA-mediated phosphorylation events.
- **Activation of PLC pathway:** Generates IP3 and DAG, leading to calcium release and PKC activation.
- **Modulation of neuronal activity:** Acts as a negative regulator of synaptic transmission and neuronal excitability.
- **Involvement in synaptic plasticity:** Contributes to the long-term regulation of synaptic strength.
In summary, Group II mGluRs are crucial regulators of neuronal signaling, acting as inhibitory modulators of glutamate-mediated neurotransmission. Their complex signaling pathways contribute to various physiological processes, including synaptic plasticity, learning, and memory.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Metabotropic glutamate receptor 3 | A metabotropic glutamate receptor 3 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q14832] | Homo sapiens (human) |
| Metabotropic glutamate receptor 2 | A metabotropic glutamate receptor 2 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q14416] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| alpha-methyl-4-carboxyphenylglycine | |||
| ibotenic acid | Ibotenic Acid: A neurotoxic isoxazole (similar to KAINIC ACID and MUSCIMOL) found in AMANITA mushrooms. It causes motor depression, ataxia, and changes in mood, perceptions and feelings, and is a potent excitatory amino acid agonist. | non-proteinogenic alpha-amino acid | neurotoxin |
| 4-carboxy-3-hydroxyphenylglycine | 4-carboxy-3-hydroxyphenylglycine: weak agonist at metabotropic glutamate receptors; occludes the action of 1-aminocyclopentyl-1,3-dicarboxylate in hippocampus | hydroxybenzoic acid | |
| 1-aminoindan-1,5-dicarboxylic acid | 1-aminoindan-1,5-dicarboxylic acid: structure given in first source | ||
| 4-carboxyphenylglycine | 4-carboxyphenylglycine: RN given for (+-)-isomer; RN for cpd without isomeric designation not available 3/93; glutamate receptor antagonist | alpha-amino acid | |
| aspartic acid | aspartic acid : An alpha-amino acid that consists of succinic acid bearing a single alpha-amino substituent Aspartic Acid: One of the non-essential amino acids commonly occurring in the L-form. It is found in animals and plants, especially in sugar cane and sugar beets. It may be a neurotransmitter. L-aspartic acid : The L-enantiomer of aspartic acid. | aspartate family amino acid; aspartic acid; L-alpha-amino acid; proteinogenic amino acid | Escherichia coli metabolite; mouse metabolite; neurotransmitter |
| d-glutamate | D-alpha-amino acid; glutamic acid | Escherichia coli metabolite; mouse metabolite | |
| glutamic acid | glutamic acid : An alpha-amino acid that is glutaric acid bearing a single amino substituent at position 2. Glutamic Acid: A non-essential amino acid naturally occurring in the L-form. Glutamic acid is the most common excitatory neurotransmitter in the CENTRAL NERVOUS SYSTEM. | glutamic acid; glutamine family amino acid; L-alpha-amino acid; proteinogenic amino acid | Escherichia coli metabolite; ferroptosis inducer; micronutrient; mouse metabolite; neurotransmitter; nutraceutical |
| quisqualic acid | Quisqualic Acid: An agonist at two subsets of excitatory amino acid receptors, ionotropic receptors that directly control membrane channels and metabotropic receptors that indirectly mediate calcium mobilization from intracellular stores. The compound is obtained from the seeds and fruit of Quisqualis chinensis. | non-proteinogenic alpha-amino acid | |
| 1-amino-1,3-dicarboxycyclopentane, (trans)-isomer | |||
| d-aspartic acid | aspartic acid; D-alpha-amino acid | mouse metabolite | |
| L-2-aminoadipic acid | L-2-aminoadipic acid : The L-enantiomer of 2-aminoadipic acid. | 2-aminoadipic acid | Escherichia coli metabolite; human metabolite |
| alpha-aminopimelic acid | 2-aminopimelic acid : An amino dicarboxylic acid that is heptanedioic acid in which a hydrogen at position 2 is replaced by an amino group. It is a component of the cell wall peptidoglycan of bacteria. alpha-aminopimelic acid: antagonizes glutamate-induced inhibitions of Helix neurones | amino dicarboxylic acid; non-proteinogenic alpha-amino acid | bacterial metabolite |
| 1-amino-1,3-dicarboxycyclopentane | 1-amino-1,3-dicarboxycyclopentane: RN given refers to (cis)-isomer | ||
| alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid | |||
| alpha-amino-3-(hydroxy)-5-methyl-4-isoxazoleacetic acid | alpha-amino-3-(hydroxy)-5-methyl-4-isoxazoleacetic acid: RN given refers to cpd without isomeric designation; structure given in first source | ||
| homocysteic acid | homocysteic acid : A non-proteinogenic alpha-amino acid that is homocysteine in which the thiol group has benn oxidised to the corresponding sulfonic acid. homocysteic acid: promotes growth in hypophysectomized rats; RN given refers to parent cpd L-homocysteic acid : A homocysteic acid with L-configuration. | homocysteic acid | NMDA receptor agonist |
| 2-amino-4-phosphonobutyric acid | (2S)-2-amino-4-phosphonobutanoic acid : A non-proteinogenc L-alpha-amino acid that is L-alpha-aminobutyric acid in which one of the hydrogens of the terminal methyl group has been replaced by a dihydroxy(oxido)-lambda(5)-phosphanyl group. It is a potent and selective agonist for the group III metabotropic glutamate receptors (mGluR4/6/7/8). | non-proteinogenic L-alpha-amino acid; phosphonic acids | metabotropic glutamate receptor agonist |
| eglumetad | eglumetad: LY-354740 is the active isomer, LY-366563 is the inactive isomer, and LY 314582 is the racemate; structure given in first source | L-alpha-amino acid | |
| 3,5-dihydroxyphenylglycine | (S)-3,5-dihydroxyphenylglycine : A glycine derivative that is L-alpha-phenylglycine substituted at positions 3 and 5 on the phenyl ring by hydroxy groups. | amino acid zwitterion; non-proteinogenic L-alpha-amino acid; resorcinols | |
| alpha-methyl-4-carboxyphenylglycine | (S)-alpha-methyl-4-carboxyphenylglycine : A non-proteinogenic alpha-amino acid that is alanine in which the alpha-hydrogen is replaced by a 4-carboxyphenyl group (the S-enantiomer). It is a non-selective group I/group II metabotropic glutamate receptor (mGluR) antagonist. alpha-methyl-4-carboxyphenylglycine: glutamate receptor antagonist | non-proteinogenic alpha-amino acid | metabotropic glutamate receptor antagonist |
| 6-methyl-2-(phenylethynyl)pyridine | 2-methyl-6-(phenylethynyl)pyridine : A methylpyridine that coinsists of 2-methylp[yridine bearing an additional phenylethynyl group at position 6. Potent and highly selective non-competitive antagonist at the mGlu5 receptor subtype (IC50 = 36 nM) and a positive allosteric modulator at mGlu4 receptors. Centrally active following systemic administration in vivo. Reverses mechanical hyperalgesia in the inflamed rat hind paw. 6-methyl-2-(phenylethynyl)pyridine: an mGlu5 antagonist | acetylenic compound; methylpyridines | anxiolytic drug; metabotropic glutamate receptor antagonist |
| 4-methylglutamic acid, threo-(l)-isomer | |||
| sib 1757 | SIB 1757: a selective mGluR5 antagonist; structure in first source | ||
| l-2-(carboxypropyl)glycine | |||
| 2-(2,3-dicarboxycyclopropyl)glycine | |||
| 2r,4r-4-aminopyrrolidine-2,4-dicarboxylate | pyrrolidinedicarboxylic acid | ||
| upf 596 | UPF 596: structure in first source | ||
| sib 1893 | SIB 1893: a selective mGluR5 antagonist; structure in first source | ||
| 4-carboxy-3-hydroxyphenylglycine | |||
| 1-amino-1,3-dicarboxycyclopentane, cis-(1s,3s)-isomer | |||
| ampa, (r)-isomer | |||
| 1-aminocyclopentane-1,3,4-tricarboxylic acid | 1-aminocyclopentane-1,3,4-tricarboxylic acid: metabolic glutamate receptor (mGluR) antagonist; structure in first source | ||
| ly 341495 | xanthenes | ||
| n-(4-(2-methoxyphenoxy)phenyl)-n-(2,2,2-trifluoroethylsulfonyl)pyrid-3-ylmethylamine | N-(4-(2-methoxyphenoxy)phenyl)-N-(2,2,2-trifluoroethylsulfonyl)pyrid-3-ylmethylamine: a metabotropic glutamate 2 receptor potentiator; structure in first source | ||
| ly 404039 | LY404039 : An organic heterobicyclic compound that is (1S,5R)-2-thiabicyclo[3.1.0]hexane carrying oxo, oxo, amino, carboxy, and carboxy groups at positions 2, 2, 4S, 4S, and 6S, respectively. It is a potent agonist of group II metabotropic glutamate receptors mGluR2 mGluR3 (Ki = 149 nM and 92 nM, respectively) and exhibits antipsychotic and anxiolytic efficacy in animal models. | bridged compound; dicarboxylic acid; non-proteinogenic amino acid derivative; organic heterobicyclic compound; sulfone | antipsychotic agent; anxiolytic drug; dopamine agonist; metabotropic glutamate receptor agonist |
| mgs 0028 | MGS 0028: a group II mGluR agonist; structure in first source | ||
| biphenyl-indanone a | biphenyl-indanone A: an mGluR2 agonist; structure in first source | biphenyls | |
| ly 389795 | LY 389795: a group II metabotropic glutamate receptor agonist; structure in first source | ||
| ly 379268 | LY 379268 : An organic heterobicyclic compound that is (1R,5S)-2-oxabicyclo[3.1.0]hexane carrying amino, carboxy, and carboxy groups at positions 4R, 4R and 6R, respectively. It is a potent agonist of group II metabotropic glutamate receptors mGluR2 and mGluR3 (EC50 = 2.69 nM and 4.48 nM, respectively) that exhibits antipsychotic-like action in animal models of schizophrenia. LY 379268: group II metabotropic glutamate receptor agonist; structure in first source | amino dicarboxylic acid; bridged compound; organic heterobicyclic compound | antipsychotic agent; anxiolytic drug; metabotropic glutamate receptor agonist; neuroprotective agent |
| a 794282 | |||
| sp 203 | 3-fluoro-5-(2-(2-(fluoromethyl)thiazol-4-yl)ethynyl)benzonitrile: a radioligand for mGlu5 receptor; structure in first source | ||
| jnj-40411813 | 1-butyl-3-chloro-4-(4-phenyl-1-piperidinyl)-(1H)-pyridone: an mGlu2 receptor modulator; structure in first source | ||
| ml289 | ML289: metabotropic glutamate receptor 3 probe |