Taste receptor type 1 member 2–taste receptor type 1 member 3 heterodimer (T1R2–T1R3)

The Taste receptor type 1 member 2–taste receptor type 1 member 3 heterodimer is a class C G protein-coupled receptor complex responsible for mediating the sensation of sweetness. It consists of two subunits—T1R2 and T1R3—that must form a functional heterodimer to detect sweet compounds. This complex recognizes a wide range of ligands including natural sugars, artificial sweeteners such as aspartame and neotame, certain d-amino acids, cyclamate, lactisole, and some sweet-tasting proteins. Ligand binding occurs mainly at the extracellular Venus flytrap domain on T1R2 for many synthetic sweeteners; other sites on both subunits contribute to recognition diversity. Upon activation by these ligands, conformational changes propagate through the transmembrane domains leading to intracellular signal transduction via associated G proteins. The T1R2–T1R3 complex plays an essential role in gustatory signaling but has limited direct implication in human disease outside its influence on dietary preferences or potential links with metabolic health. Its structure-function relationships have been elucidated through molecular modeling and mutagenesis studies that highlight key residues involved in ligand specificity across species differences[4][3][1].

Other names

Sweet taste receptorTAS1R2–TAS1R3T1R2/T1R3 heterodimerType 1 taste receptor (sweet)

Agonists bind to the extracellular Venus flytrap domain of T1R2, activating the heterodimer and initiating intracellular G protein signaling that leads to sweet taste perception.