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Family-B G-protein-coupled Receptors

Overview
Journal Genome Biol
Specialties Biology
Genetics
Date 2002 Jan 16
PMID 11790261
Citations 119
Authors
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Abstract

All G-protein-coupled receptors (GPCRs) share a common molecular architecture (with seven putative transmembrane segments) and a common signaling mechanism, in that they interact with G proteins (heterotrimeric GTPases) to regulate the synthesis of intracellular second messengers such as cyclic AMP, inositol phosphates, diacylglycerol and calcium ions. Historically, GPCRs have been classified into six families, which were thought to be unrelated; three of these are found in vertebrates. Recent work has identified several new GCPR families and suggested the possibility of a common evolutionary origin for all of them. Family B (the secretin-receptor family or 'family 2') of the GPCRs is a small but structurally and functionally diverse group of proteins that includes receptors for polypeptide hormones, molecules thought to mediate intercellular interactions at the plasma membrane and a group of Drosophila proteins that regulate stress responses and longevity. Family-B GPCRs have been found in all animal species investigated, including mammals, Caenorhabditis elegans and Drosophila melanogaster, but not in plants, fungi or prokaryotes. In this article, I describe the structures and functions of family-B GPCRs and propose a simplified nomenclature for these proteins.

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