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GPR1

Family: Class A Orphans

Contents:
Gene and Protein Information
Previous and Unofficial Names
Database Links
Agonists
Tissue Distribution
Expression Datasets
Gene Expression and Pathophysiology
Biologically Significant Variants
General Comments
References
Gene and Protein Information
class A G protein-coupled receptor
Species TM AA Chromosomal Location Gene Symbol Gene Name Reference
Human 7 355 2q33.3 GPR1 G protein-coupled receptor 1
Mouse 7 353 1 C2 Gpr1 G protein-coupled receptor 1
Rat 7 353 9q31 Gpr1 G protein-coupled receptor 1
Previous and Unofficial Names
GPR1
G-protein coupled receptor 1
probable G-protein coupled receptor 1
G protein-coupled receptor 1
Database Links
Ensembl
Entrez Gene
GeneCards
GenitoUrinary Development Molecular Anatomy Project
HomoloGene
Human Protein Reference Database
InterPro
KEGG Gene
OMIM
PharmGKB Gene
PhosphoSitePlus
Protein Ontology (PRO)
RefSeq Nucleotide
RefSeq Protein
TreeFam
UniGene Hs.
UniProt
Wikipedia
Agonists
Key to terms and symbols Click column headers to sort
Ligand Sp. Action Affinity Units Reference
chemerin {Sp: Human} Hs Full agonist 8.28 pKd 3
chemerin {Sp: Human} Hs Full agonist 9.62 pEC50 3
Agonist Comments
vMIP-I was found to be a strong inhibitor of HIV infection mediated by GPR1 [31]. A C-terminal fragment representing amino acids 145–157 of the mature chemerin protein activated GPR1 with an EC50 of 1 nM [3]. GPR1 has also been described as a receptor for chimerin, although its functional relevance is currently unknown [4].
Tissue Distribution
Fetal astrocytes
Species:  Human
Technique:  RT-PCR
References:  6
Hippocampus
Species:  Human
Technique:  Northern blot
References:  22
Trophoblastic cells from early placenta
Species:  Human
Technique:  RT-PCR
References:  25
Oral keratinocytes
Species:  Human
Technique:  RT-PCR
References:  15
CD4+ alveolar macrophages
Species:  Human
Technique:  RT-PCR
References:  9
Mesangial cells
Species:  Human
Technique:  RT-PCR, Western blot
References:  36
Diencephalon, dorsal root ganglion, tongue, fetal liver, spongiotrophoblast layer of the placenta
Species:  Mouse
Technique:  In situ hybridisation
References:  12
Hippocampus
Species:  Rat
Technique:  Northern blot
References:  23
Tissue Distribution Comments
Rhesus macaque brain capillary endothelial cells express GPR1 [8], as do simian astrocytes [6]. GPR1 is upregulated in normal human oral keratinocytes in cell senescence (microarray analysis) [15]. GPR1 has been identified in simian brain progenitor cells by RT-PCR [14].

In addition to the tissue distribution studies outlined above, GPR1 has also been shown to be expressed in the following cells lines:

CEMss, U87, HeLa and 293T mouse cell lines using RT-PCR [7]

BT-3,U87/CD4 (high); BT-20/Nm (medium); C8166 (low) human cells lines using RT-PCR [29]
Expression Datasets

Click here to show/hide data

Log average relative transcript abundance in mouse tissues measured by qPCR from Regard, J.B., Sato, I.T., and Coughlin, S.R. (2008). Anatomical profiling of G protein-coupled receptor expression. Cell, 135(3): 561-71. [PMID:18984166] [Raw data: website]

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Gene Expression and Pathophysiology Comments
GPR1 serves as a coreceptor for SIV and HIV [9,11,26,38], although use of receptors other than CCR5 by HIV has been shown to be rare in vitro [41]. Only one SIV Env protein, BK28, can mediate infection via GPR1 in a CD4-dependent manner [7,20,36]. Utilisation of orphan receptors as coreceptors is variable and heterogenous [32], although one paper demonstrates GPR1's action as a coreceptor allowing replication of HIV type 1 and 2 in brain derived cell lines [29]. Inhibition of HIV-1 infection can be achieved with synthetic peptide analogues derived from the NH2 terminal extracellular region of GPR1 [13]. A small domain of a few amino acids containing a tyrosine is critical for the co-receptor activity of GPR1 [30].
Biologically Significant Variants
V256L
SNP accession:  rs79246498 
Type:  Naturally occurring SNPs.
Species:  Human
References: 
I307V
SNP accession:  rs3732083 
Type:  Naturally occurring SNPs.
Species:  Human
References: 
General Comments
Results from yeast Saccharomyces cerevisiae suggest that Gpr1p is a G-protein coupled receptor which localized at plasma membrane. It is likely that a Gpr1p monitors the extracellular signal such as nutrition and transduce it via Gpa2p a possible positive regulator of cAMP level [10,21,39,41]. The GPR1/GPA2 pathway activates the Sch9p kinase to generate a response that acts in parallel with that generated by the Ras/cAMP pathway [40], and mediates the response of cells to the toxic action of dicarbon compounds like acetic acid and ethanol [37], and pseudohyphal differentiation via PKA and PLC [1,16,24,27,33-34]. Gpr1 is specifically required for glucose activation of the cAMP pathway [18,28]. Glucose-stimulated calcium influx is inhibited in GPR1 depleted cells [35], and receptor delection slows adaptation to acetic acid [2]. The receptor may also have a role in the activation cascade of yeast plasma membrane proton pump [17]. Glucose and sucrose agonise the Saccharomyces cerevisiae GPCR, whilst mannose antagonises it [5,19].
Available Assays
DiscoveRx PathHunter® CHO-K1 GPR1 (Orphan) High Expression β-Arrestin Cell Line Human Cat No. 93-0335C2
DiscoveRx PathHunter® eXpress GPR1 CHO-K1 β-Arrestin (Orphan) GPCR Assay Human Cat No. 93-0335E2C2

REFERENCES

To cite this database page, please use the following:

Amy E. Monaghan.
Class A Orphans: GPR1. Last modified on 02/11/2012. Accessed on 24/05/2013. IUPHAR database (IUPHAR-DB), http://iuphar-db.org/DATABASE/ObjectDisplayForward?objectId=82.


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