Nitric Oxide Detection Compounds Using Sulfonamide Luminescence Probes
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Solution Overview
Problem
Current methods for detecting nitric oxide (NO) suffer from low specificity and generate false positives due to reactions with other molecules, necessitating the development of quantitative and specific assays.
Innovation Solution
The use of caged aminoluciferin and aminocyanobenzothiazole compounds that selectively react with nitric oxide, forming stable reporter products for luminescence detection through luciferin-utilizing luciferase enzymes, allowing for homogeneous 'add and read' plate-based assays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If o-phenylene diamine based reactive moieties are used for NO detection, then detection capability is achieved, but false positives occur due to reaction with bis electrophiles such as dehydroascorbic acid
Solution Approach 1:
The patent extracts the problematic o-phenylene diamine reactive moiety from the detection system and replaces it with a sulfonamide-based reactive moiety. This extraction of the harmful component eliminates the false positive reactions with bis electrophiles while retaining the ability to detect nitric oxide through the luciferin-luciferase luminescence pathway.
Solution Approach 2:
The patent changes the chemical parameter of the reactive moiety from o-phenylene diamine to sulfonamide group. This parameter change in the chemical structure fundamentally alters the reactivity profile, making the probe selective for nitric oxide while avoiding cross-reactions with other bis electrophiles present in biological samples.
2Measurement precision
If indirect colorimetric measurement through Griess reaction is used, then NO detection is achieved, but the method measures terminal products rather than direct NO
Solution Approach 1:
The patent introduces a direct NO-reactive probe containing a sulfonamide reactive moiety that directly reacts with nitric oxide to form a stable intermediate that can be detected by luciferin-utilizing luciferase. This intermediary probe enables direct measurement of NO rather than measuring downstream terminal products, preserving information about actual NO levels.
3Reliability
If caged aminoluciferin compounds are used for direct NO detection, then specificity is improved, but the assay requires luciferin-utilizing luciferase addition
Solution Approach 1:
The patent designs the caged aminoluciferin compound with a sulfonamide reactive moiety that self-reacts with nitric oxide in the sample to form the detectable luminescent product. The compound essentially services its own detection function by directly converting NO signal into luminescence output, reducing the need for complex additional reagents or steps.
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 compounds provide high specificity for nitric oxide detection, reducing false positives and enabling quantitative measurement of NO levels in various samples, including live cells, with stable reporter products that allow for continuous monitoring of NO production.
Implementation Method 1
detecting luminescence in the sample
Implementation Method 2
luciferin-utilizing luciferase enzymes, allowing for homogeneous 'add and read' plate-based assays
Data Source
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AI summary
Disclosed herein are compounds that can be used to selectively detect nitric oxide in samples. Also disclosed herein are compositions comprising the compounds and methods of detecting nitric oxide using the compounds.