Native Taste Receptor Screening via Enzyme Complementation
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Solution Overview
Problem
Existing methods for screening taste compounds rely on taste receptors that are stably or transiently expressed in cells that do not natively express the receptor, leading to improper expression and function, resulting in high false positive or negative results due to non-optimal environmental conditions and general responses to stimuli.
Innovation Solution
A method using cells natively expressing G-protein coupled taste receptors in combination with an enzyme complementation system, where the enzyme becomes active upon receptor activation, allowing for specific and sensitive detection of taste modulating compounds by reacting with a substrate to produce a measurable signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If taste receptors are stably or transiently expressed in easily transfectable cells that do not natively express the receptor, then the screening process is easier to perform, but the taste receptor may not be expressed and folded properly, leading to false positive or negative results
Solution Approach 1:
The patent uses cells that natively express taste receptors (such as taste bud cells or cells from taste-responsive tissues) instead of transfected cells. This copying of the natural expression system ensures proper receptor folding, post-translational modifications, and functional activation pathways, thereby improving measurement precision while maintaining screening capability through in vitro cell assays
Solution Approach 2:
The patent changes the fundamental parameter of cell type selection from easily transfectable heterologous cells to native expressing cells. This parameter change ensures that receptors are expressed in their natural cellular environment with appropriate chaperones, membrane composition, and signaling machinery, resolving the contradiction between ease of operation and measurement precision
2Adaptability or versatility
If taste receptors are expressed in non-native cells, then the screening method can be applied to a wider range of compounds, but the pathway may not function properly like in a native cell
Solution Approach 1:
By copying the native expression system using cells that naturally express taste receptors (such as HEK-293 cells engineered to natively express human taste receptors or primary taste bud cells), the patent ensures that the complete signaling pathway functions properly including G-protein coupling, second messenger generation, and downstream effects, while maintaining versatility in screening various taste compounds
Solution Approach 2:
The patent creates a composite cellular system that combines the native expression capability of specific cell types with the versatility needed for high-throughput screening. This may involve using cell lines that can be easily cultured and manipulated while natively expressing the receptor, or using primary cells with appropriate co-expression of necessary pathway components, thereby achieving both reliability and adaptability
3Productivity
If conventional screening methods are used with transfected cells, then the assay can be performed in high throughput, but high false positive or negative results occur due to non-optimal environmental conditions
Solution Approach 1:
The patent copies the native taste receptor expression system in cultured cells that maintain proper receptor function and signaling pathways. By using cells that natively express the receptors with appropriate post-translational modifications and cellular environment, the assay achieves high measurement precision while maintaining high throughput capability through automated cell-based screening formats
Solution Approach 2:
The patent replaces the mechanical/transfection-based expression system with a biological/native expression system. Instead of using transient or stable transfection methods that compromise receptor function, the patent uses cells that naturally express the receptors, substituting the artificial transfection mechanism with a physiological expression mechanism that ensures proper folding, trafficking, and function, thereby improving accuracy without sacrificing throughput
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
This approach provides a sensitive and specific method for identifying sweet, umami, or bitter taste modulating compounds, enhancing the accuracy of taste receptor activation testing and screening, and allowing for the detection of novel non-caloric or low-caloric sweeteners and optimal blends with enhanced sweet taste.
Implementation Method 1
an enzyme complementation system, where the enzyme becomes active upon receptor activation, allowing for specific and sensitive detection of taste modulating compounds by reacting with a substrate to produce a measurable signal
Data Source
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AI summary
The invention refers to a method of testing activation of a G-protein coupled taste receptor and a method for screening a sweet, an umami or a bitter taste modulating taste compound or a mixture thereof, on a cell natively expressing the taste receptor and comprising an enzyme complementation system. Further, the invention is directed to a kit comprising such cell and a substrate for the enzyme of the enzyme complementation system.