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TAS1R2
T1R2 - Taste receptor type 1 member 2 is a protein that in humans is encoded by the TAS1R2 gene.
The sweet taste receptor is predominantly formed as a dimer of T1R2 and T1R3 by which different organisms sense this taste. The mammalian sweet taste receptor was first characterized by Charles Zuker lab in 2001.
In songbirds, however, the T1R2 monomer does not exist, and they sense the sweet taste through the umami taste receptor (T1R1 and T1R3) as a result of an evolutionary change that it has undergone.
The human TAS1R2 gene, located on chromosome 1 at band p36.13 (coordinates 18,839,599–18,859,660 on the reverse strand, GRCh38), encodes a class C G protein-coupled receptor involved in sweet taste perception. The gene spans six exons and produces a protein of 839 amino acids that forms a functional heterodimer with TAS1R3 to detect sweet compounds. Its regulatory region contains multiple promoters and transcription factor binding sites, supporting tissue-specific expression. Genetic variation in TAS1R2 has been linked to differences in sweet taste sensitivity, sugar intake, and metabolic traits.
T1R2+3 expressing cells are found in circumvallate papillae and foliate papillae near the back of the tongue and palate taste receptor cells in the roof of the mouth. These cells are shown to synapse upon the chorda tympani and glossopharyngeal nerves to send their signals to the brain. T1R and T2R (bitter) channels are not expressed together in taste buds.
The TAS1R2 protein is a member of the class C G protein-coupled receptor (GPCR) family and plays a critical role in sweet taste perception as part of the TAS1R2/TAS1R3 heterodimer. Structurally, TAS1R2 features a large extracellular N-terminal domain known as the Venus flytrap domain (VFD), which is responsible for binding a wide range of sweet-tasting compounds, including natural sugars and high-potency sweeteners. This VFD is connected to a seven-transmembrane domain (TMD) by a cysteine-rich domain (CRD), forming the canonical architecture of class C GPCRs. The TMD itself consists of seven alpha-helical segments that span the cell membrane and are involved in signal transduction. The integrity of the structure is further stabilized by multiple disulfide bridges within the VFD, CRD, and between domains. The overall architecture allows for ligand-induced conformational changes that are transmitted from the VFD through the CRD to the TMD, ultimately leading to G protein activation and downstream signaling.
The atomic structure of human sweet taste receptor (T1R2+T1R3) was resolved at 2024 by the same group that discovered the receptor.
The TAS1R2 protein is a crucial component of the sweet taste receptor, functioning primarily as part of a heterodimer with TAS1R3. This receptor complex is responsible for detecting a wide variety of sweet compounds, including natural sugars, artificial sweeteners, and some amino acids, in taste bud cells of the tongue. Upon binding of sweet molecules to the extracellular Venus flytrap domain of TAS1R2, the receptor undergoes conformational changes that trigger intracellular signaling cascades via G protein activation, ultimately leading to the perception of sweetness. Beyond its role in taste, TAS1R2 is also expressed in other tissues, such as skeletal muscle and the intestine, where it acts as a nutrient sensor. In skeletal muscle, TAS1R2 detects ambient glucose levels and regulates metabolic pathways by modulating NAD homeostasis and mitochondrial function through an ERK1/2-PARP1 signaling axis, thereby influencing muscle fitness and energy metabolism. Additionally, TAS1R2 activity in the gut can affect glucose absorption and insulin release, linking sweet taste perception to broader metabolic regulation. Genetic variations in TAS1R2 have been shown to influence individual differences in sweet taste sensitivity, sugar intake, and metabolic responses to glucose.
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TAS1R2 AI simulator
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TAS1R2
T1R2 - Taste receptor type 1 member 2 is a protein that in humans is encoded by the TAS1R2 gene.
The sweet taste receptor is predominantly formed as a dimer of T1R2 and T1R3 by which different organisms sense this taste. The mammalian sweet taste receptor was first characterized by Charles Zuker lab in 2001.
In songbirds, however, the T1R2 monomer does not exist, and they sense the sweet taste through the umami taste receptor (T1R1 and T1R3) as a result of an evolutionary change that it has undergone.
The human TAS1R2 gene, located on chromosome 1 at band p36.13 (coordinates 18,839,599–18,859,660 on the reverse strand, GRCh38), encodes a class C G protein-coupled receptor involved in sweet taste perception. The gene spans six exons and produces a protein of 839 amino acids that forms a functional heterodimer with TAS1R3 to detect sweet compounds. Its regulatory region contains multiple promoters and transcription factor binding sites, supporting tissue-specific expression. Genetic variation in TAS1R2 has been linked to differences in sweet taste sensitivity, sugar intake, and metabolic traits.
T1R2+3 expressing cells are found in circumvallate papillae and foliate papillae near the back of the tongue and palate taste receptor cells in the roof of the mouth. These cells are shown to synapse upon the chorda tympani and glossopharyngeal nerves to send their signals to the brain. T1R and T2R (bitter) channels are not expressed together in taste buds.
The TAS1R2 protein is a member of the class C G protein-coupled receptor (GPCR) family and plays a critical role in sweet taste perception as part of the TAS1R2/TAS1R3 heterodimer. Structurally, TAS1R2 features a large extracellular N-terminal domain known as the Venus flytrap domain (VFD), which is responsible for binding a wide range of sweet-tasting compounds, including natural sugars and high-potency sweeteners. This VFD is connected to a seven-transmembrane domain (TMD) by a cysteine-rich domain (CRD), forming the canonical architecture of class C GPCRs. The TMD itself consists of seven alpha-helical segments that span the cell membrane and are involved in signal transduction. The integrity of the structure is further stabilized by multiple disulfide bridges within the VFD, CRD, and between domains. The overall architecture allows for ligand-induced conformational changes that are transmitted from the VFD through the CRD to the TMD, ultimately leading to G protein activation and downstream signaling.
The atomic structure of human sweet taste receptor (T1R2+T1R3) was resolved at 2024 by the same group that discovered the receptor.
The TAS1R2 protein is a crucial component of the sweet taste receptor, functioning primarily as part of a heterodimer with TAS1R3. This receptor complex is responsible for detecting a wide variety of sweet compounds, including natural sugars, artificial sweeteners, and some amino acids, in taste bud cells of the tongue. Upon binding of sweet molecules to the extracellular Venus flytrap domain of TAS1R2, the receptor undergoes conformational changes that trigger intracellular signaling cascades via G protein activation, ultimately leading to the perception of sweetness. Beyond its role in taste, TAS1R2 is also expressed in other tissues, such as skeletal muscle and the intestine, where it acts as a nutrient sensor. In skeletal muscle, TAS1R2 detects ambient glucose levels and regulates metabolic pathways by modulating NAD homeostasis and mitochondrial function through an ERK1/2-PARP1 signaling axis, thereby influencing muscle fitness and energy metabolism. Additionally, TAS1R2 activity in the gut can affect glucose absorption and insulin release, linking sweet taste perception to broader metabolic regulation. Genetic variations in TAS1R2 have been shown to influence individual differences in sweet taste sensitivity, sugar intake, and metabolic responses to glucose.