Mas-related G protein-coupled receptor X1 (IPR027338)

Short name: MRGPCRX1

Overlapping homologous superfamilies


Family relationships


Members of the mas-related receptor family (also known as oncogene-like MAS and mas-related G-protein coupled receptor MRG) have been implicated in the development, regulation and function of nociceptive neurons, specifically in the modulation of pain. Most members are orphaned, with no endogeneous ligand identified. Of the human mas-related GPCRs, four (MRGPRD, MRGPRE, MRGPRF and MRGPRG) are also found in rodents, whereas MRGPRX1, MRGPRX2, MRGPRX3 and MRGPRX4 are found exclusively in primates. Certain rodent MRGs have been reported to respond to adenine [PMID: 12084918] and to RF-amide peptides, including neuropeptide FF [PMID: 12397184, PMID: 18250432], but the relevance of these findings to man is unclear. MRGs are expressed predominantly in small diameter sensory neurons of the dorsal root ganglia, where there is emerging evidence that they may be mediators of histamine-independent itch [PMID: 20004959, PMID: 21460831].

Mas-related G protein-coupled receptor X1 is thought to be involved with nociceptor function and development, and in the modulation of pain. The receptor is currently orphaned, no specific endogenous ligand having been identified. However, it may potently be activated by enkephalins: BAM22 evokes a large and dose-dependent release of intracellular calcium in cells stably transfected with the receptor [PMID: 11850634].

GO terms

Biological Process

GO:0007186 G protein-coupled receptor signaling pathway

Molecular Function

GO:0004930 G protein-coupled receptor activity

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.