Fluorescence Detection Kit for Activated Complement C1s Enzymatic Activity
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Solution Overview
Problem
Current methods for detecting the enzymatic activity of activated complement C1s in clinical samples are unable to distinguish between activated and non-activated states, limiting their effectiveness in reflecting the functional status of C1s and complement activation.
Innovation Solution
A fluorescence detection kit utilizing a C1s-specific recombinant antibody coupled with immunomagnetic beads and a FRET-labeled substrate peptide, which quantitatively measures the enzymatic activity of activated C1s through fluorescence intensity changes, allowing for accurate detection in blood and body fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods (bidirectional diffusion assay, ELISA, gelatin zymography) are used, then total protein content of C1s can be detected, but they cannot distinguish between activated and non-activated states of C1s
Solution Approach 1:
The patent introduces a specific substrate peptide as an intermediary that selectively reacts with activated C1s but not pro-C1s. This substrate peptide acts as a mediator that converts the enzymatic activity difference between activated and non-activated C1s into a measurable fluorescence signal, enabling functional status detection while maintaining total protein detection capability
Solution Approach 2:
The patent changes the detection parameter from total protein concentration to enzymatic activity level by using a fluorescence-based assay. By measuring the fluorescence intensity resulting from substrate cleavage, the method detects the functional state (activated vs. non-activated) of C1s, thereby gaining information about complement activation status that was previously inaccessible
2Ease of operation
If conventional detection methods are used, then detection can be performed with simple procedures, but the results cannot objectively reflect the enzymatic activity of activated C1s
Solution Approach 1:
The patent replaces complex mechanical/chemical detection systems (bidirectional diffusion, gel electrophoresis) with a fluorescence-based optical detection system. This substitution maintains operational simplicity through automated fluorescence reading while dramatically improving reliability by providing objective, quantitative measurement of enzymatic activity that directly reflects activated C1s levels
3Measurement precision
If a fluorescence detection method is developed to detect enzymatic activity, then accurate reflection of activated C1s functional status is achieved, but the device complexity increases
Solution Approach 1:
The patent utilizes fluorescence intensity changes as a direct readout of enzymatic activity. The substrate peptide contains a fluorophore that emits fluorescence upon cleavage by activated C1s, providing a simple optical signal that accurately reflects functional status without requiring complex instrumentation or multi-step processing
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 kit provides high sensitivity and specificity, enabling precise evaluation of complement activation states, supporting clinical diagnosis, individualized treatment, and disease mechanism research.
Implementation Method 1
A fluorescence detection kit utilizing a C1s-specific recombinant antibody coupled with immunomagnetic beads and a FRET-labeled substrate peptide, which quantitatively measures the enzymatic activity of activated C1s through fluorescence intensity changes
Data Source
AI summary
A fluorescence detection kit for the enzymatic activity of activated complement C1s, a detection method using the same, and use of the same are provided for a purpose of detecting the enzymatic activity level of the activated complement C1s in a sample. Specific capture and magnetic separation of C1s in a C1s standard or a sample to be tested are performed based on a magnetic bead precoated with a C1s recombinant antibody. After non-specific binders are removed, a fluorescence resonance energy transfer (FRET) fluorescein labeled substrate peptide for enzyme digestion by C1s is added, and a fluorescence signal in an obtained reaction system is detected with a microplate reader. Accordingly, the enzymatic activity of activated C1s is quantitatively determined by detecting changes of a fluorescence intensity.