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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Ig-hepta, a novel member of the G protein-coupled hepta-helical receptor (GPCR) family that has immunoglobulin-like repeats in a long N-terminal extracellular domain and defines a new subfamily of GPCRs.

A novel member of the G protein-coupled receptor (GPCR) family was cloned and characterized, which is unique, among the members, in its long extracellular domain comprising Ig-like repeats and in its high expression predominantly in the lung. The clone (Ig-Hepta) was first identified as a polymerase chain reaction product generated with primers designed to amplify secretin receptor family members including the parathyroid hormone-related peptide receptors. Analysis of the open reading frame of cDNAs isolated from a rat lung cDNA library indicated that Ig-Hepta is a protein of 1389 amino acid residues and has two Ig-like repeats in the N-terminal extracellular domain (exodomain) of 1053 amino acid residues and 7 transmembrane spans in the C-terminal region. Northern blot analysis revealed very high expression of its mRNA in the lung and low but detectable levels in the kidney and heart. The mRNA expression in the lung was found to be strongly induced postnatally. Biochemical analysis indicated that Ig-Hepta is a highly glycosylated protein and exists as a disulfide-linked dimer. Immunohistochemistry on rat lung and kidney sections revealed dense localization of Ig-Hepta in alveolar walls and intercalated cells in the collecting duct, respectively, suggesting a role in the regulation of acid-base balance. Ig-Hepta defines a new subfamily of GPCRs.[1]

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