Thioether Labeling via N-Sulfonamide Reagents for Methionine Detection
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Solution Overview
Problem
Current methods for detecting methionine and methionine sulfoxide in proteins are limited by the inefficiencies of mass spectroscopy and antibody techniques, which hinder understanding of the implications of oxidation states in cellular processes.
Innovation Solution
The development of methods and compositions for labeling thioethers, such as methionine, using N-(sulfaneylidene)sulfonamide compounds, which involve contacting a thioether with N-sulfonamide or N-(tetrazol-5-yl)-sulfanimine to form labeled compounds that can incorporate biotin, fluorescent dyes, or other labels, allowing for selective labeling of methionine residues without affecting primary thiol groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mass spectroscopy is used to detect methionine and methionine sulfoxide, then detection capability is provided, but the method is limited by inefficiency and complexity
Solution Approach 1:
The patent introduces N-sulfonamide and N-(tetrazol-5-yl)-sulfanimine as intermediary labeling reagents that specifically react with methionine residues. These intermediaries convert the detection problem into a simpler fluorescent or biotin-based readout, avoiding the complexity of direct mass spectroscopy analysis while maintaining detection precision.
Solution Approach 2:
The patent replaces the mechanical/physical detection system (mass spectroscopy) with a chemical labeling system followed by simpler detection methods (fluorescence, biotin-streptavidin binding). This substitution reduces device complexity while preserving measurement precision through specific chemical reactions with methionine residues.
2Reliability
If antibody techniques are used to detect methionine oxidation states, then detection is enabled, but the methods present limitations in efficiency and applicability
Solution Approach 1:
The patent changes the detection parameter from antibody-antigen recognition to specific chemical reactivity of N-sulfonamide and N-(tetrazol-5-yl)-sulfanimine with methionine thioether groups. This parameter change enables faster, more efficient detection while maintaining reliability through the specificity of the chemical reactions.
Solution Approach 2:
The patent applies local quality by designing labeling reagents that specifically target methionine residues with unique chemical properties (thioether group). The N-sulfonamide and N-(tetrazol-5-yl)-sulfanimine reagents exhibit localized reactivity only at methionine sites, enabling efficient and reliable detection without cross-reactivity with other amino acids.
3Loss of information
If current detection methods are used, then methionine oxidation can be detected, but understanding of oxidation state implications in cellular processes is limited
Solution Approach 1:
The patent creates a universal labeling platform using N-sulfonamide and N-(tetrazol-5-yl)-sulfanimine that can detect both methionine and methionine sulfoxide residues. This multi-functional approach enables comprehensive analysis of oxidation states across different cellular processes, reducing information loss while maintaining operational simplicity through a unified detection methodology.
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
This approach enables more effective detection and measurement of methionine oxidation in proteins, providing improved methods for identifying and quantifying methionine sulfoxide residues, which can serve as clinical biomarkers of oxidative stress.
Implementation Method 1
contacting a compound containing a thioether with a N-sulfonamide or N-(tetrazol-5-yl)-sulfanimine to form N-(sulfaneylidene)sulfonamide labeled compounds
Implementation Method 2
contacting a compound containing a thioether with a metal or metal salt, with a compound comprising a N-sulfonamide providing a N-(sulfaneylidene)sulfonamide labeled compound formed at the thioether group
Data Source
AI summary
This disclosure relates to compositions and methods for labeling of thioethers, e.g., S-methyl thioether such as methionine or peptides containing the same. In certain embodiments, this disclosure relates to methods of forming N-(sulfaneylidene)sulfonamide labeled compounds, comprising contacting a compound containing a thioether with a N-sulfonamide or N-(tetrazol-5-yl)-suilfanimine.