HormR

Domain present in hormone receptors
HormR
SMART accession number:SM00008
Description:
Interpro abstract (IPR001879):

G-protein-coupled receptors, GPCRs, constitute a vast protein family that encompasses a wide range of functions (including various autocrine, paracrine and endocrine processes). They show considerable diversity at the sequence level, on the basis of which they can be separated into distinct groups. We use the term clan to describe the GPCRs, as they embrace a group of families for which there are indications of evolutionary relationship, but between which there is no statistically significant similarity in sequence [(PUBMED:8170923)]. The currently known clan members include the rhodopsin-like GPCRs, the secretin-like GPCRs, the cAMP receptors, the fungal mating pheromone receptors, and the metabotropic glutamate receptor family. There is a specialised database for GPCRs (http://www.gpcr.org/7tm/).

The secretin-like GPCRs include secretin [(PUBMED:1646711)], calcitonin [(PUBMED:1658940)], parathyroid hormone/parathyroid hormone-related peptides [(PUBMED:1658941)] and vasoactive intestinal peptide [(PUBMED:1314625)], all of which activate adenylyl cyclase and the phosphatidyl-inositol-calcium pathway. These receptors contain seven transmembrane regions, in a manner reminiscent of the rhodopsins and other receptors believed to interact with G-proteins (however there is no significant sequence identity between these families, the secretin-like receptors thus bear their own unique '7TM' signature). Their N terminus is probably located on the extracellular side of the membrane and potentially glycosylated. This N-terminal region contains a long conserved region which allow the binding of large peptidic ligand such as glucagon, secretin, VIP and PACAP; this region contains five conserved cysteines residues which could be involved in disulphide bond. The C-terminal region of these receptor is probably cytoplasmic. Every receptor gene in this family is encoded on multiple exons, and several of these genes are alternatively spliced to yield functionally distinct products.

This domain is found in the extracellular part of some of the secretin-like (family 2) GPCRs including the calcitonin receptor; corticotropin releasing factor receptor 1; diuretic hormone receptor; glucagon-like peptide 1 receptor; and parathyroid hormone peptide receptor.

GO component:membrane (GO:0016020)
GO function:G-protein coupled receptor activity (GO:0004930)
Family alignment:
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There are 829 HormR domains in 809 proteins in SMART's nrdb database.

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