December 15, 2025 - 2012). The activation of bitter taste receptors starts a signaling cascade (Fig. 4). Upon ligand binding, the TAS2R's conformation changes, and the heterotrimeric G protein dissociates into Gα-gustducin (McLaughlin et al.

Our functional analysis identified cholesterol as an orthosteric agonist and the bitter tastant cmpd28.1 as a positive allosteric modulator with direct agonist activity at TAS2R14. Moreover, the orthosteric pocket is connected to the allosteric site via an elongated cavity, which has a hydrophobic core rich in aromatic residues. Our findings provide insights into the ligand recognition of bitter taste receptors and suggest activities of TAS2R14 beyond bitter taste perception via intracellular allosteric tastants.

May 24, 2024 - Our functional analysis identified cholesterol as an orthosteric agonist and the bitter tastant cmpd28.1 as a positive allosteric modulator with direct agonist activity at TAS2R14. Moreover, the orthosteric pocket is connected to the allosteric site via an elongated cavity, which has a hydrophobic core rich in aromatic residues. Our findings provide insights into the ligand recognition of bitter taste receptors and suggest activities of TAS2R14 beyond bitter taste perception via intracellular allosteric tastants.

2 weeks ago - This receptor is also found in ... which activates this receptor might cause excessive bladder contraction. Taste helps to identify toxins, maintain nutrition, and regulate appetite, immune responses, and gastrointestinal motility. Five basic tastes are recognized today: salty, sweet, bitter, sour, and ...

June 7, 2023 - Whether extra-oral bitter taste receptors function as sensors for endogenous agonists is unknown. To address this question, we devised functional experiments combined with molecular modeling approaches to investigate human and mouse receptors using a variety of bile acids as candidate agonists. We show that five human and six mouse receptors are responsive to an array of bile acids. Moreover, their activation threshold concentrations match published data of bile acid concentrations in human body fluids, suggesting a putative physiological activation of non-gustatory bitter receptors.

February 18, 2026 - These cells are studded with tiny receptors that bind to molecules in food called tastants. This binding helps to activate nerve cells that send signals to the brain, which then give us the sensation of taste.

Xu et al. determined the structures of the human bitter taste receptor TAS2R46 bound to a mini–G protein containing the TAS2R46-binding site from the G protein gustducin. The structures reveal distinct features of TAS2R46 compared with other GPCRs and provide insight into how ligands such as the bitter alkaloid strychnine activate this GPCR to evoke a bitter taste.

Activation of Tas2r108 in the gut results in a remodeling of enteroendocrine hormone release and bile acid metabolism that ameliorates multiple features of metabolic syndrome. Targeting extraoral bitter taste receptors may be useful in metabolic ...

June 1, 2010 - Further mutagenesis identified additional residues important for receptor-specific agonist activation, indicating that interaction with such a variety of compounds is governed by more than two amino acids in TM7 and may as well include residues that are identical in hTAS2R43, -R31, and -R46. Another component affecting agonist selectivity of hTAS2Rs could be a tight access control for “wrong” bitter compounds.

November 5, 2020 - Hop components (MHBA) targets specific human and mouse bitter taste receptors (T2Rs). •Knockdown of T2Rs suppressed calcium response by MHBA in enteroendocrine cells. •Knockdown of T2Rs suppressed an MHBA-induced cholecystokinin (CCK) production. •Specific T2R activation by MHBA drives calcium response and CCK production.

April 11, 2024 - Researchers found that when bitter tastants come into contact with TAS2R14 receptors, the chemicals wedge themselves into to a specific spot on the receptor called an allosteric site, this causes the protein to change its shape, activating the ...

April 10, 2024 - The structures suggest that different molecules modulate the receptor’s function at two distinct regions of the receptor, and that dual binding at these regions leads to complete activation.

August 4, 2018 - Activation of Tas2r108 in the gut results in a remodeling of enteroendocrine hormone release and bile acid metabolism that ameliorates multiple features of metabolic syndrome. Targeting extraoral bitter taste receptors may be useful in metabolic ...

Further mutagenesis identified additional residues important for receptor-specific agonist activation, indicating that interaction with such a variety of compounds is governed by more than two amino acids in TM7 and may as well include residues that are identical in hTAS2R43, -R31, and -R46. Another component affecting agonist selectivity of hTAS2Rs could be a tight access control for “wrong” bitter compounds.

Whether extra-oral bitter taste receptors function as sensors for endogenous agonists is unknown. To address this question, we devised functional experiments combined with molecular modeling approaches to investigate human and mouse receptors using a variety of bile acids as candidate agonists. We show that five human and six mouse receptors are responsive to an array of bile acids. Moreover, their activation threshold concentrations match published data of bile acid concentrations in human body fluids, suggesting a putative physiological activation of non-gustatory bitter receptors.

We investigated whether human bitter receptors (hTAS2Rs) recognize bitterness of peptides with a heterologous expression system. HEK293 cells expressing hTAS2R1, hTAS2R4, hTAS2R14, and hTAS2R16 responded to bitter casein digests. Among those cells, the hTAS2R1-expressing cell was most strongly activated by the synthesized bitter peptides Gly-Phe and Gly-Leu, and none of the cells was activated by the non-bitter dipeptide Gly-Gly.

In the oral cavity, TAS2Rs are located on the surface of taste receptor cells so they can interact directly with possible tastants (Behrens et al. 2012). The activation of bitter taste receptors starts a signaling cascade (Fig. 4). Upon ligand binding, the TAS2R's conformation changes, and ...

January 28, 2026 - Using a cellular test system and ... new evidence that steroid hormones such as progesterone, testosterone and hydrocortisone could act as endogenous activators of human bitter taste receptors....

May 27, 2024 - Furthermore, not only did the bitter taste receptors (taste receptor type 2 family, T2Rs) show taste effects, but extra-oral T2Rs could also be activated by binding with bitter components, regulating physiological activities via modulating hormone ...

December 2, 2022 - These tests revealed that the perhaps most well-known bitter compound in coffee, caffeine, activated in total five TAS2Rs, namely TAS2R7, −R10, −R14, −R43, and −R46 (6), whereas a whole array of additional substances, mozambioside, ...