Enzyme Detection Device Using Dual Capture Zones
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Solution Overview
Problem
Existing enzyme detection assays face challenges with accuracy and reproducibility due to the lack of a clear endpoint in reactions, particularly when measuring enzyme activity in samples like wound fluid or urine, where protease activity is involved.
Innovation Solution
A device and method utilizing an indicator molecule with a cleavage site, a first capture site, and a detection region, where the cleavage of the indicator molecule results in a fragment that is captured differently in two distinct zones, allowing for the accurate detection of enzyme activity by preventing further cleavage and providing a reliable end-point assay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If chromatographic medium is used to immobilize substrate-reporter complex at upstream site, then enzyme activity can be detected through reporter flow to downstream site, but the signal changes with time due to continuous cleavage of immobilized reactive complex, resulting in no clear endpoint and reduced accuracy
Solution Approach 1:
The device is divided into two distinct capture zones: a first capture zone that immobilizes intact indicator molecules to prevent further cleavage, and a second capture zone that detects cleaved fragments. This segmentation resolves the contradiction by separating the functions of preventing continuous cleavage and detecting enzyme activity, thereby establishing a clear endpoint and improving both accuracy and reproducibility.
2Measurement precision
If indicator molecule is captured by first capture molecules to prevent further cleavage, then clear endpoint is established, but device complexity increases due to additional capture zones and molecules
Solution Approach 1:
The indicator molecule is designed with multiple functional regions: a cleavage site that reacts with enzyme, a first capture site that binds to first capture molecules, and a detection region with a second capture site that binds to second capture molecules. This multi-functionality allows a single molecule to serve multiple purposes, establishing a clear endpoint while maintaining assay simplicity.
Solution Approach 2:
The first capture molecules act as intermediaries that bind to intact indicator molecules and prevent further enzyme cleavage, while the second capture molecules serve as intermediaries for detecting cleaved fragments in the second capture zone. These intermediary molecules enable the establishment of a clear endpoint without significantly complicating the overall device structure.
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 solution enables precise and reproducible detection of enzyme activity, particularly in samples with low enzyme levels, by preventing further cleavage of the indicator molecule and allowing for the reliable detection of cleaved fragments, thus improving the accuracy and reliability of enzyme activity measurements.
Implementation Method 1
first capture molecules capable of binding to the first capture site of the indicator molecule but not the cleaved fragment of the indicator molecule comprising the detection region and wherein the indicator molecule is captured by binding of the first capture site to the first capture molecules thereby substantially preventing any subsequent cleavage of the cleavage site by the enzyme
Implementation Method 2
second capture zone comprises second capture molecules capable of binding to the second capture site of the indicator molecule, wherein the second capture zone is spatially separated from the first capture zone, and wherein detection of any cleaved indicator molecule via the detection region and bound via the second capture site to the second capture molecules
Implementation Method 3
an indicator molecule for adding to the test sample, said indicator molecule comprising (a) a cleavage site, which can be cleaved by said enzyme if said enzyme cleavage activity is present
Data Source
AI summary
Described herein is an enzyme detection device for detecting or measuring the presence in a test sample of the activity of an enzyme capable of cleaving a substrate. Also provided are methods for detecting enzyme activity, in particular the presence in a test sample of an enzyme capable of cleaving a substrate, and methods for determining the level or amount of such an enzyme in a test sample.