Masked Chromogenic Substrates for Protease Detection
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Solution Overview
Problem
Current protease assays are expensive, insensitive, and nonselective, requiring high concentrations of target protease, leading to self-destruction and limited options for multiplexing tests due to the availability of chromogenic or fluorogenic substrates, which results in high background noise and impracticality for high-throughput screening.
Innovation Solution
Development of new chromogenic and fluorogenic protease substrates with masked chromophore and fluorophore moieties, such as rhodamine derivatives, that undergo significant color or fluorescence shifts upon enzymatic hydrolysis, allowing for clear detection without sophisticated instruments and low background noise, enabling detection of protease activities and endotoxins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high concentrations of target protease are used in current assays, then the protease activity can be detected, but the protease undergoes self-destruction and the assay becomes impractical for high-throughput screening
Solution Approach 1:
The patent changes the chemical parameters of the substrate by introducing masked chromophore and fluorophore moieties with specific chemical structures (e.g., rhodamine derivatives). These structural modifications enable the substrate to produce strong optical signals at low protease concentrations, resolving the contradiction between detection precision and protease stability.
2Measurement precision
If conventional chromogenic or fluorogenic substrates are used, then protease activity can be detected, but the background noise is high and detection sensitivity is reduced
Solution Approach 1:
The patent extracts and separates the chromophore and fluorophore moieties from the substrate structure, masking them until enzymatic cleavage occurs. This extraction approach ensures that the optical signal is generated only after protease action, eliminating background noise and enhancing detection sensitivity.
Solution Approach 2:
The patent utilizes color changes and fluorescence shifts as the basis for detection. The masked chromophore and fluorophore moieties undergo significant color or fluorescence shifts upon enzymatic hydrolysis, providing clear detection signals with minimal background interference.
3Adaptability or versatility
If limited chromogenic or fluorogenic substrates are used, then assays can be performed, but multiplexing tests of multiple protease activities are restricted
Solution Approach 1:
The patent creates a universal platform with masked chromophore and fluorophore moieties that can detect multiple protease activities. By varying the amino acid sequences flanking the cleavage site, the same core structure can be adapted to detect different proteases, enabling multiplexing without increasing system complexity.
4Measurement precision
If expensive and insensitive current substrates are used, then protease assays can be performed, but the cost is high and sensitivity is insufficient for practical applications
Solution Approach 1:
The patent employs substrates with masked chromophore and fluorophore moieties that can be synthesized cost-effectively. The design allows for high sensitivity detection without requiring expensive reagents, making the assay practical for high-throughput screening and routine applications.
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 new substrates provide sensitive and selective detection of protease activities and endotoxins with reduced background noise, facilitating rapid diagnostic applications and high-throughput screening without the need for high enzyme concentrations, enhancing the accuracy and efficiency of protease assays.
Implementation Method 1
proteases are a class of enzymes that catalytically hydrolyze peptide bonds
Implementation Method 2
Fluorogenic substrates are the molecules that change from weakly fluorescent or nonfluorescent to highly fluorescent upon enzymatic hydrolysis
Implementation Method 3
Chromogenic substrates are molecules that change from weakly colored or colorless to highly colored upon enzymatic hydrolysis
Data Source
AI summary
The disclosure provides chromogenic and fluorogenic compounds comprising amino acid or peptide appendages that are capable of detecting an activity in a bioassay. Also provided herein are methods for detecting a biological activity in a sample with the subject chromogenic and fluorogenic compounds. In one embodiment, provided herein is a method for detecting endotoxin in a sample. Further provided herein are kits including the subject chromogenic and fluorogenic compounds for detecting a biological activity in a sample.