Modular Chemical Probe For Citrulline Detection
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Solution Overview
Problem
Current methods for detecting citrullinated proteins are either not selective or not sensitive enough, and existing chemical probes are difficult to synthesize and costly, limiting their widespread adoption for diagnosing autoimmune diseases.
Innovation Solution
Development of a modular chemical probe with a 1,3-dicarbonyl reactive head that reacts with citrulline side chains, allowing for separate attachment of read-out subunits such as fluorophores or nanoparticles, enhancing sensitivity and versatility in detection methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mass-spectrometry is used for detection, then the method is powerful for protein analysis, but the selectivity is insufficient because the mass difference between arginine and citrulline is only 1 Dalton
Solution Approach 1:
The patent introduces a chemical probe as an intermediary substance that specifically binds to citrulline residues. This probe acts as a mediator between the citrullinated proteins and the detection system, enabling selective identification through fluorescence or other detectable signals while overcoming the insufficient mass resolution of direct mass-spectrometry analysis
2Reliability
If anti-citrulline antibodies are used, then the presence of citrulline can be detected, but the sensitivity is insufficient for determining citrulline in large concentrations
Solution Approach 1:
The patent employs chemical probes with fluorophore labels that undergo significant changes in optical parameters (fluorescence intensity, wavelength) upon binding to citrulline. This parameter change approach provides significantly higher sensitivity compared to antibody-based methods, enabling detection at much lower concentrations relevant to autoimmune disease diagnostics
3Measurement precision
If existing chemical probes are used, then accurate detection of citrulline is achieved, but the probes are difficult to synthesize and cumbersome to use, resulting in high prices
Solution Approach 1:
The chemical probe is divided into separate functional modules: a reactive head group that specifically binds to citrulline and a fluorophore or detection label. This segmentation allows independent optimization and simplification of each component, making the overall probe easier and less expensive to synthesize while maintaining detection accuracy
Solution Approach 2:
The patent designs a universal reactive head group that can be coupled with various fluorophores or detection labels. This universal component can be synthesized once and reused with multiple detection moieties, reducing overall synthesis complexity and cost while maintaining accurate citrulline detection capability
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 chemical probes provide improved sensitivity and flexibility in detecting citrullinated proteins, enabling more accurate and practical diagnostic tools for autoimmune diseases.
Implementation Method 1
a reactive head formed of 1,3-dicarbonyl moiety that reacts with a citrulline side chain
Data Source
AI summary
An improved chemical probe for the detection of the amino acid citrulline combines: 1) a reactive head formed of 1,3-dicarbonyl moiety that reacts with a citrulline side chain in an improved manner compared to currently used 1,2-dicarbonyl moieties; and 2) a modular action of the probe where citrulline side chains are labeled first using reactive heads described above, and attachment of a read-out subunit or tag, be it a fluorophore, a nanoparticle, or an antigen is performed separately. The modular nature of the chemical probe increases the sensitivity of the probes due to their smaller size. Additionally, the chemical probes of the present disclosure allow the same sample to be analyzed using a variety of read-out methods.