Chimeric Umami Receptor Signal Window Expansion
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Solution Overview
Problem
Current methods for expressing and screening umami taste receptors in eukaryotic cells, such as U2OS cells, face challenges in achieving a robust and measurable response, limiting the effectiveness of umami taste modulation assays.
Innovation Solution
The expression of a chimeric umami taste receptor in U2OS cells, comprising a human T1R1 subunit and a rat-human T1R3 subunit, coupled with a G-protein, enhances the signal window and allows for high-throughput screening of umami taste modulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a human T1R1 umami taste receptor subunit is expressed in eukaryotic cells, then the cell can detect umami taste stimuli, but the signal window is narrow and the response is not robust enough for effective screening
Solution Approach 1:
The patent creates a chimeric receptor by combining the human T1R1 subunit with a rat T1R3 subunit. This composite receptor structure integrates components from different species to achieve both specific umami detection capability and enhanced signaling properties, resolving the contradiction between measurement precision and response reliability
Solution Approach 2:
The patent introduces a specific mutation (R148Q) at a localized position within the T1R1 subunit. This local modification optimizes the receptor's interaction with the G-protein or enhances signal transduction at a specific site, thereby improving the overall signal window and response robustness without altering the entire receptor structure
2Measurement precision
If current umami taste receptor expression methods are used, then the basic detection function is achieved, but the sensitivity and reliability of umami taste modulation assays are limited
Solution Approach 1:
The patent changes the molecular parameters of the receptor by introducing the R148Q mutation and creating the chimeric structure. These parameter changes enhance the receptor's sensitivity to umami stimuli and improve the reliability of downstream signaling, enabling more effective assay performance
Solution Approach 2:
The patent creates a modified copy of the natural human umami receptor by incorporating the rat T1R3 subunit and the R148Q mutation. This engineered copy retains the essential umami detection function while improving sensitivity and assay reliability through structural optimizations
Data Source
AI summary
The present disclosure generally relates to the expression of T1R1+3 taste receptors in eukaryotic cells, such as U2OS cells. The disclosure also relates to the expression of a chimeric T1R3 taste receptor subunit to enable the T1R1 taste receptor subunit to achieve a higher level of sensitivity to umami compounds. Also disclosed are methods of expressing T1R1+3 taste receptors in such cells, and methods of screening for substances that modulate T1R1+3 receptor sensing, and which, therefore, may be useful as modulators of umami taste.