Enzyme Detection Device Using Intermediary Protease
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Solution Overview
Problem
Existing enzyme detection devices are limited in their ability to measure the activity of enzymes that modify their substrates, as they often require specific detection reagents and can be inaccurate due to the need to distinguish between modified and unmodified enzyme substrates.
Innovation Solution
A standardized enzyme detection device that uses an indicator molecule with an enzyme modifiable region and a detection region, where the enzyme modifiable region is transformed from an unmodified to a modified state by the enzyme, and a selective capture zone to separate and detect these forms, allowing for accurate measurement of enzyme activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a substrate-reporter reactive complex is used to detect enzyme activity, then the device can measure enzyme activity through reporter release, but it cannot detect enzymes that modify rather than cleave substrates
Solution Approach 1:
The patent introduces an intermediary protease that specifically cleaves the modified substrate to release the reporter. This intermediary enzyme acts as a mediator between the modifying enzyme activity and the detection system, enabling indirect detection of modifying enzymes through a two-step process: first the modifying enzyme modifies the substrate, then the intermediary protease cleaves the modified substrate to release the detectable reporter signal
Solution Approach 2:
The patent replaces the direct mechanical/cleavage-based detection mechanism with a biochemical cascade mechanism. Instead of directly detecting substrate modification, the system uses a biochemical pathway where the modified substrate serves as a substrate for a second protease, substituting direct detection with an indirect biochemical amplification and detection cascade
2Measurement precision
If specific detection reagents are used to distinguish modified and unmodified substrates, then detection specificity is improved, but the availability of suitable reagents is limited
Solution Approach 1:
The patent creates a universal detection platform where the intermediary protease and reporter system can detect multiple types of enzyme activities (proteases, phosphatases, kinases, glycosidases, lipases) through a common mechanism. The modified substrates from different enzyme types all share the common feature of being substrates for the intermediary protease, making the detection system universally applicable across different enzyme classes without requiring enzyme-specific detection reagents
Solution Approach 2:
The patent changes the detection parameter from direct substrate modification detection to intermediary protease substrate detection. By modifying the substrate to include a recognition sequence for the intermediary protease, the system transforms the detection parameter to something that can be universally detected across different enzyme types, bypassing the limitation of requiring specific reagents for each enzyme type
3Measurement precision
If a detection system requires discrimination between modified and unmodified substrate forms, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the detection process into distinct functional zones on a lateral flow device: a reaction zone where the modifying enzyme acts on the substrate, a separation zone where modified and unmodified substrates are separated, and a detection zone where the intermediary protease cleaves the modified substrate to release the reporter. This spatial segmentation simplifies the overall device complexity by organizing complex functions into distinct, manageable zones
4Reliability
If multiple reagents are used to achieve accurate enzyme activity detection, then measurement reliability is improved, but the assay becomes less adaptable to different enzymes
Solution Approach 1:
The patent designs a universal detection platform where the intermediary protease and reporter system serve multiple enzyme detection functions. The same core reagents (intermediary protease, reporter-containing substrate structure) can detect different enzyme types (proteases, phosphatases, kinases, glycosidases, lipases) by simply changing the recognition sequence on the substrate, thereby maintaining reliability through consistent detection methodology while achieving versatility across enzyme types
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 device provides a robust and adaptable method for measuring enzyme activity in test samples, capable of detecting various enzymes, including those that modify their substrates, with improved accuracy and reliability.
Implementation Method 1
the selective capture zone comprises selective recognition molecules capable of binding to the enzyme modifiable region of the indicator molecule selectively in one or other of the modified or unmodified states
Implementation Method 2
an enzyme modifiable region, which can be modified by said enzyme causing transformation of the region from an unmodified to a modified state
Implementation Method 3
The present invention provides a standardised assay format for measuring enzyme activity in a test sample
Data Source
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AI summary
The present invention relates to an enzyme detection device for use in the detection of enzyme activity in a test sample. The invention also relates to indicator molecules for use in the detection of enzyme activity, particularly enzyme cleavage activity, in a test sample, and to methods for detecting the presence of enzyme activity.