Target type: biologicalprocess
A phospholipase C-activating G protein-coupled receptor signaling pathway initiated by glutamate binding to its receptor on the surface of a target cell, and ending with the regulation of a downstream cellular process, e.g. transcription. [GOC:dph, GOC:mah, GOC:signaling, GOC:tb]
The phospholipase C-activating G protein-coupled glutamate receptor signaling pathway is a complex cellular mechanism involved in various physiological processes, including neurotransmission, neuronal plasticity, and cell growth. It is initiated by the binding of glutamate, a neurotransmitter, to its specific receptor, a G protein-coupled receptor (GPCR) known as the metabotropic glutamate receptor (mGluR). Upon glutamate binding, the mGluR undergoes a conformational change, activating a heterotrimeric G protein, typically of the Gq/11 subtype. This activation leads to the dissociation of the G protein α-subunit from the βγ-subunit.
The activated Gαq/11 subunit then binds to and activates phospholipase C (PLC), an enzyme that catalyzes the hydrolysis of phosphatidylinositol 4,5-bisphosphate (PIP2) into two second messengers: diacylglycerol (DAG) and inositol trisphosphate (IP3). DAG remains associated with the plasma membrane and activates protein kinase C (PKC), a serine/threonine kinase that phosphorylates various downstream target proteins, leading to diverse cellular responses.
IP3, on the other hand, diffuses into the cytoplasm and binds to IP3 receptors on the endoplasmic reticulum (ER), triggering the release of calcium ions (Ca2+) from intracellular stores. The increase in cytosolic Ca2+ concentration activates various calcium-dependent signaling pathways, including the calmodulin (CaM)-dependent protein kinase (CaMK) pathway and the calcineurin pathway.
In addition to these canonical signaling events, other downstream pathways can be activated by the mGluR signaling cascade. These include the mitogen-activated protein kinase (MAPK) pathway, the phosphoinositide 3-kinase (PI3K) pathway, and the Ras-related GTPase pathway.
The activation of these downstream pathways ultimately results in a wide range of cellular responses, including modulation of neuronal excitability, synaptic plasticity, cell proliferation, and cell survival. These effects are crucial for maintaining proper brain function and regulating various physiological processes.
In summary, the phospholipase C-activating G protein-coupled glutamate receptor signaling pathway is a multifaceted signaling cascade that plays a critical role in neuronal function and beyond. Its activation by glutamate triggers a series of events involving G protein activation, PLC activation, production of second messengers (DAG and IP3), and activation of downstream signaling pathways, leading to a diverse array of cellular responses.'
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| Protein | Definition | Taxonomy |
|---|---|---|
| Metabotropic glutamate receptor 1 | A metabotropic glutamate receptor 1 that is encoded in the genome of human. [PRO:DNx, UniProtKB:Q13255] | Homo sapiens (human) |
| Metabotropic glutamate receptor 5 | A metabotropic glutamate receptor 5 that is encoded in the genome of human. [PRO:DNx, UniProtKB:P41594] | Homo sapiens (human) |
| Compound | Definition | Classes | Roles |
|---|---|---|---|
| benzoic acid | aromatic carboxylic acid : Any carboxylic acid in which the carboxy group is directly bonded to an aromatic ring. benzoic acid : A compound comprising a benzene ring core carrying a carboxylic acid substituent. Benzoic Acid: A fungistatic compound that is widely used as a food preservative. It is conjugated to GLYCINE in the liver and excreted as hippuric acid. | benzoic acids | algal metabolite; antimicrobial food preservative; drug allergen; EC 1.13.11.33 (arachidonate 15-lipoxygenase) inhibitor; EC 3.1.1.3 (triacylglycerol lipase) inhibitor; human xenobiotic metabolite; plant metabolite |
| 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 |
| kainic acid | Kainic Acid: (2S-(2 alpha,3 beta,4 beta))-2-Carboxy-4-(1-methylethenyl)-3-pyrrolidineacetic acid. Ascaricide obtained from the red alga Digenea simplex. It is a potent excitatory amino acid agonist at some types of excitatory amino acid receptors and has been used to discriminate among receptor types. Like many excitatory amino acid agonists it can cause neurotoxicity and has been used experimentally for that purpose. | dicarboxylic acid; L-proline derivative; non-proteinogenic L-alpha-amino acid; pyrrolidinecarboxylic acid | antinematodal drug; excitatory amino acid agonist |
| 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 | |
| quinpirole | quinpirole : A pyrazoloquinoline that is (4aR,8aR)-4,4a,5,6,7,8,8a,9-octahydro-1H-pyrazolo[3,4-g]quinoline substituted by a propyl group at position 5. It acts as a dopamine agonist. Quinpirole: A dopamine D2/D3 receptor agonist. | pyrazoloquinoline | dopamine agonist |
| 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 | |||
| philanthotoxin 343 | philanthotoxin 343: structure given in first source (see article's footnote); identical to philanthotoxin 433 except that the number of methylene groups between the respective amine moieties is 3,4,3 instead of 4,3,3 | N-acyl-amino 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 |
| 9-(dimethylamino)-3-(4-methoxyphenyl)-4-pyrido[1,2]thieno[3,4-d]pyrimidinone | organic heterobicyclic compound; organonitrogen heterocyclic compound; organosulfur heterocyclic compound | ||
| 4-bromohomoibotenic acid, (rs)-isomer | |||
| 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 | |||
| 2-chloro-5-hydroxyphenylglycine | 2-chloro-5-hydroxyphenylglycine: activates mGlu(5) receptors; structure in first source | ||
| 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 | ||
| ly-367385 | |||
| 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 | ||
| dinitrofluorobenzene | 3,3'-difluorobenzaldazine: a selective positive allosteric modulator of mGluR5 activity; structure in first source | ||
| 3-((2-methyl-1,3-thiazol-4-yl)ethynyl)piperidine | 3-((2-methyl-1,3-thiazol-4-yl)ethynyl)piperidine: an excitatory amino acid antagonist | ||
| ly 341495 | xanthenes | ||
| mgs 0028 | MGS 0028: a group II mGluR agonist; structure in first source | ||
| azd9272 | AZD9272: an mGluR5 antagonist | ||
| bay36-7620 | BAY36-7620: a potent non-competitive mGlu1 receptor antagonist with inverse agonist activity. ; structure in first source | ||
| mavoglurant | mavoglurant: antagonist of metabotropic glutamate receptor 5 | ||
| n-(4-chloro-2-((1,3-dioxo-1,3-dihydro-2h-isoindol-2-yl)methyl)phenyl)-2-hydroxybenzamide | N-(4-chloro-2-((1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)methyl)phenyl)-2-hydroxybenzamide: a positive allosteric modulator of mGluR5; structure in first source | ||
| 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 |
| 3-(5-pyridin-2-yl-2h-tetrazol-2-yl)benzonitrile | 3-(5-pyridin-2-yl-2H-tetrazol-2-yl)benzonitrile: structure in first source | ||
| 3-fluoro-5-(5-pyridin-2-yl-2h-tetrazol-2-yl)benzonitrile | 3-fluoro-5-(5-pyridin-2-yl-2H-tetrazol-2-yl)benzonitrile: structure in first source | ||
| r 214127 | R 214127: an mGlu1 receptor ligand; structure in first source | ||
| 3-cyano-n-(1,3-diphenyl-1h-pyrazol-5-yl)benzamide | 3-cyano-N-(1,3-diphenyl-1H-pyrazol-5-yl)benzamide: affects mGluR5 receptors; structure in first source | ||
| jnj16259685 | organic heterotricyclic compound; organonitrogen heterocyclic compound; oxacycle | ||
| adx 47273 | |||
| basimglurant | |||
| a 794282 | |||
| a-841720 | A-841720: structure in first source | ||
| ro 4956371 | 2-chloro-4-((2,5-dimethyl-1-(4-(trifluoromethoxy)phenyl)-1H-imidazol-4-yl)ethynyl)pyridine: a metabotropic glutamate receptor 5 antagonist; structure in first source | ||
| vu0092273 | VU0092273: mGlu(5) positive allosteric modulator | ||
| sp 203 | 3-fluoro-5-(2-(2-(fluoromethyl)thiazol-4-yl)ethynyl)benzonitrile: a radioligand for mGlu5 receptor; structure in first source | ||
| vu0361737 | |||
| 6-fluoro-2-(4-(pyridin-2-yl)but-3-yn-1-yl)imidazo(1,2-a)pyridine | 6-fluoro-2-(4-(pyridin-2-yl)but-3-yn-1-yl)imidazo(1,2-a)pyridine: an mGluR5 antagonist; structure in first source | ||
| wms 1410 | |||
| vu0409106 | VU0409106: a metabotropic glutamate receptor 5 antagonist; structure in first source | ||
| n-cyclobutyl-6-((3-fluorophenyl)ethynyl)nicotinamide | N-cyclobutyl-6-((3-fluorophenyl)ethynyl)nicotinamide: an mGlu5 agonist; structure in first source | ||
| ml289 | ML289: metabotropic glutamate receptor 3 probe | ||
| lsn2463359 | |||
| 3-chloro-5-(6-(5-fluoropyridin-2-yl)pyrimidin-4-yl)benzonitrile | 3-chloro-5-(6-(5-fluoropyridin-2-yl)pyrimidin-4-yl)benzonitrile: a metabotropic glutamate receptor 5 antagonist; structure in first source | ||
| fenobam | fenobam: in USAN fenobam refers to monohydrate | ureas |