Chimeric T1R Taste Receptors for Sweet Umami Detection
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Solution Overview
Problem
Current technologies lack effective methods to identify and modulate sweet and umami taste receptors, particularly in distinguishing between sweet and umami taste stimuli and enhancing taste responses to compounds.
Innovation Solution
Development of chimeric taste receptor polypeptides by combining portions of T1R1 and T1R2 genes with T1R3 receptors, expressed in host cells like HEK-293, to create chimeric receptors that respond to sweet and umami taste stimuli or enhance existing taste responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If chimeric taste receptor polypeptides are developed by combining T1R1 and T1R2 genes with T1R3 receptors, then the ability to identify and modulate sweet and umami taste receptors is improved, but the device complexity increases
Solution Approach 1:
The chimeric taste receptor is constructed by segmenting the parental T1R1 and T1R2 receptors into distinct functional domains (extracellular N-terminal domain and transmembrane domain) and recombining these segments to create novel receptor configurations. This segmentation allows systematic exploration of structure-function relationships while managing construction complexity through modular assembly approaches.
Solution Approach 2:
The chimeric taste receptor design achieves multi-functionality by combining domains from different parental receptors (T1R1 for umami, T1R2 for sweet) within a single receptor protein. This allows the chimeric receptor to potentially respond to multiple taste modalities or to be used in multiple assay formats (heteromeric and homomeric configurations), thereby improving versatility without proportionally increasing operational complexity.
2Measurement precision
If chimeric taste receptors are used to distinguish between sweet and umami taste stimuli, then measurement precision is improved, but the difficulty of detecting and measuring increases
Solution Approach 1:
The chimeric taste receptor introduces local quality differentiation by placing specific parental receptor domains in defined positions within the chimera structure. The extracellular N-terminal domain from one parental receptor is combined with the transmembrane domain from another, creating localized functional regions that confer specific ligand binding properties. This local quality approach enables precise distinction between sweet and umami stimuli through targeted domain contributions.
Solution Approach 2:
The chimeric taste receptor acts as an intermediary system that translates complex taste stimuli into measurable cellular responses. By creating intermediate receptor structures with defined domain compositions, the system facilitates detection and measurement of taste responses through established cellular assay methods, thereby reducing the overall difficulty of measurement while maintaining precision.
3Productivity
If chimeric taste receptor polypeptides are expressed in host cells, then productivity of taste modulator identification is improved, but the device complexity increases
Solution Approach 1:
The chimeric taste receptor polypeptides are constructed and validated in advance through heteromeric and homomeric expression configurations before being deployed in high-throughput screening assays. This preliminary action of creating predefined receptor expressions in host cells (such as HEK-293 cells) establishes ready-to-use systems that improve productivity during actual modulator identification campaigns, as the complex receptor construction work is completed beforehand.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The chimeric receptors effectively identify sweet and umami taste modulators and enhancers, demonstrating enhanced responsiveness to various taste compounds, including sweeteners and umami ligands, as shown in calcium imaging experiments.
Implementation Method 1
The T1Rs belong to class-C G protein coupled receptors, and each Class-C GPCR consists of a large N-terminal extracellular domain and a C-terminal 7-transmembrane domain
Implementation Method 2
demonstrating enhanced responsiveness to various taste compounds, including sweeteners and umami ligands, as shown in calcium imaging experiments
Data Source
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AI summary
This invention relates to chimeric taste receptors comprising the extracellular portion of one T1R or a variant or fragment thereof, either T1R1 or T1R2, and the transmembrane portion of another T1R or a variant or fragment thereof, either T1R1 or T1R2, preferably associated with a T1R3 polypeptide and a suitable G protein. These chimeric taste receptors and cells which express such chimeric taste receptors are useful in assays for identifying sweet and umami ligands as well in assays for identifying sweet and umami enhancers. Additionally, these chimeric taste receptors and cells which express same can be used to map and determine where specific sweet and umami ligands interact with their respective receptors and to elucidate the mechanism of receptor activation.