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Metabotropic glutamate receptor 3

GRM3
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesGRM3, GLUR3, GPRC1C, MGLUR3, mGlu3, glutamate metabotropic receptor 3
External IDsOMIM: 601115; MGI: 1351340; HomoloGene: 651; GeneCards: GRM3; OMA:GRM3 - orthologs
Orthologs
SpeciesHumanMouse
Entrez

2913

108069

Ensembl

ENSG00000198822

ENSMUSG00000003974

UniProt

Q14832

Q9QYS2

RefSeq (mRNA)

NM_000840
NM_001363522

NM_181850

RefSeq (protein)

NP_000831
NP_001350451

NP_862898

Location (UCSC)Chr 7: 86.64 – 86.86 Mbn/a
PubMed search[2][3]
Wikidata
View/Edit HumanView/Edit Mouse

Metabotropic glutamate receptor 3 (mGluR3) is an inhibitory Gi/G0-coupled G-protein coupled receptor (GPCR)[4] generally localized to presynaptic sites of neurons in classical circuits.[5] However, in higher cortical circuits in primates, mGluR3 are localized post-synaptically, where they strengthen rather than weaken synaptic connectivity.[6] In humans, mGluR3 is encoded by the GRM3 gene.[7][8] Deficits in mGluR3 signaling have been linked to impaired cognition in humans,[9] and to increased risk of schizophrenia,[10] consistent with their expanding role in cortical evolution.

Structure

In humans, mGluR3 is encoded by the GRM3 gene on chromosome 7. At least five protein-coding isoforms are predicted based on genomic information. The mGluR3 protein is a seven-pass transmembrane protein.

Function

L-glutamate is the major excitatory neurotransmitter in the central nervous system and activates both ionotropic and metabotropic glutamate receptors. Glutamatergic neurotransmission is involved in most aspects of normal brain function and can be perturbed in many neuropathologic conditions. The metabotropic glutamate receptors are a family of G protein-coupled receptors, that have been divided into 3 groups on the basis of sequence homology, putative signal transduction mechanisms, and pharmacologic properties. Group I includes GRM1 and GRM5 and these receptors have been shown to activate phospholipase C. Group II includes GRM2 and GRM3 while Group III includes GRM4, GRM6, GRM7 and GRM8. Group II and III receptors are linked to the inhibition of the cyclic AMP cascade but differ in their agonist selectivities.[8]

Clinical significance

The mGluR3 receptor encoded by the GRM3 gene has been found to be associated with a range of psychiatric disorders, including bipolar affective disorder[11] as well as schizophrenia.[12][10]

A mutation in the Kozak sequence in the 1st exon of the GRM3 gene was shown to change translation and transcription of cloned GRM3 gene constructs and was significantly associated with bipolar disorder with an odds ratio of 4.4.[11] Subsequently, a marker in GRM3 was implicated in a large genome-wide association study of schizophrenia with statistical significance of p<10−9.[13] A follow-up study of the Kozak sequence variant showed that it was associated with increased risk of bipolar disorder, schizophrenia and alcoholism.[14] The mGluR3 receptor encoded by GRM3 is targetable by several drugs that have been used in previous trials of schizophrenia and anxiety disorder. The agonist, antagonist and allosteric modulator drugs of mGluR3 can now be explored as new treatments for mental illness.[11] Other scientific evidence has been published which shows that the well established anti-manic drug lithium carbonate also changes GRM3 gene expression in the mouse brain after treatment with lithium carbonate.[15]

Ligands

mGluR3 modulators that are significantly selective over the isoform mGluR2 are known since 2013.

Agonists

  • with a bicyclo[3.1.0]hexane skeleton
  • (R)-2-amino-4-(4-hydroxy[1,2,5]thiadiazol-3-yl)butyric acid[22]

Antagonists

D3-ML337

Allosteric modulators

  • D3-ML337: selective NAM, IC50 = 450 nM for mGluR3, IC50 >30μM for mGluR2[26]
  • MNI-137:[27] inhibitor
  • VU-0650786: NAM[28]
  • compound 7p:[29] non-competitive antagonist (presumably allosteric inhibitor)
  • LY 2389575: negative allosteric modulator.[30]

Interactions

Metabotropic glutamate receptor 3 has been shown to interact with:

See also

References

  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000198822 – Ensembl, May 2017
  2. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  3. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ Ambrosini A, Bresciani L, Fracchia S, Brunello N, Racagni G (May 1995). "Metabotropic glutamate receptors negatively coupled to adenylate cyclase inhibit N-methyl-D-aspartate receptor activity and prevent neurotoxicity in mesencephalic neurons in vitro" (abstract). Molecular Pharmacology. 47 (5): 1057–64. PMID 7746273.
  5. ^ Shigemoto R, Kinoshita A, Wada E, Nomura S, Ohishi H, Takada M, et al. (October 1997). "Differential presynaptic localization of metabotropic glutamate receptor subtypes in the rat hippocampus". The Journal of Neuroscience. 17 (19): 7503–22. doi:10.1523/JNEUROSCI.17-19-07503.1997. PMC 6573434. PMID 9295396.
  6. ^ Jin LE, Wang M, Galvin VC, Lightbourne TC, Conn PJ, Arnsten AF, Paspalas CD (March 2018). "mGluR2 versus mGluR3 Metabotropic Glutamate Receptors in Primate Dorsolateral Prefrontal Cortex: Postsynaptic mGluR3 Strengthen Working Memory Networks". Cerebral Cortex. 28 (3): 974–987. doi:10.1093/cercor/bhx005. PMC 5974790. PMID 28108498.
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Further reading

This article incorporates text from the United States National Library of Medicine, which is in the public domain.

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