Proteome-Wide Covalent Ligand Profiling for Parallel Target Quantification
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Solution Overview
Problem
Current methods are inadequate for identifying and quantifying the binding interactions of reactive chemical probes with various components in whole cell proteomes.
Innovation Solution
A method and composition for profiling electrophilic compounds using comparative mass spectrometry analysis, involving the use of clickable tags and detectable labels to identify and quantify covalent interactions with proteins, utilizing techniques like click chemistry and tandem mass spectrometry for enrichment and quantification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional binding assays are used to identify protein targets, then specificity is maintained, but throughput is limited and only single targets can be analyzed at a time
Solution Approach 1:
The proteome is segmented into individual protein components that can be independently tagged and analyzed. Each protein is labeled with unique barcodes or mass spectrometry tags, allowing parallel identification of multiple binding targets simultaneously through high-throughput mass spectrometry analysis
Solution Approach 2:
Chemical probes with electrophilic moieties serve as intermediaries that covalently bind to nucleophilic amino acid residues on target proteins. These probes enable the detection and quantification of binding interactions across the entire proteome by acting as mediators between the small molecule compound and the protein targets
2Quantity of substance
If covalent binding assays are performed across the entire proteome, then comprehensive target identification is achieved, but quantification precision is insufficient
Solution Approach 1:
The method employs parameter changes in the form of isotopic labeling and mass spectrometry detection parameters. By incorporating stable isotopes and using high-resolution mass spectrometry with specific m/z ratio detection, the system achieves precise quantification of covalent binding interactions across thousands of proteins simultaneously
Solution Approach 2:
Traditional mechanical or manual quantification methods are replaced with mass spectrometry-based detection. The use of mass spectrometry provides automated, high-precision measurement of protein-probe binding stoichiometry and quantification without manual intervention, enabling accurate analysis of proteome-wide interactions
3Reliability
If electrophilic compounds are screened against native biological systems, then physiological relevance is maintained, but background noise from non-specific binding increases
Solution Approach 1:
The method extracts and isolates specific protein-probe binding interactions from the complex biological background. By using covalent labeling followed by affinity purification and mass spectrometry analysis, specific binders are separated from non-specific background, enabling identification of true physiological targets while maintaining relevance to native systems
Solution Approach 2:
Preliminary covalent labeling of proteins with electrophilic probes is performed before analysis. This preliminary action allows subsequent enrichment and isolation of labeled proteins, separating specific binding events from non-specific background interactions and enabling cleaner detection of true targets in native biological systems
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
Enables the simultaneous identification and quantification of covalent interactions between electrophilic compounds and thousands of proteins, providing valuable data for potential therapeutic development.
Implementation Method 1
the electrophilic moiety covalently binds a nucleophilic amino acid residue in the protein target
Implementation Method 2
reacting the proteomic sample of a) and b) with a compound having a tag, for example biotin, to conjugate the biotin tag to protein targets
Implementation Method 3
The resulting peptides are then chemically labeled with isobaric mass tags to facilitate comparative mass spectrometry analysis
Data Source
AI summary
The present disclosure provides a profiling method based on comparative mass spectrometry analysis for identifying and quantifying the covalent interactions of electrophilic compounds with diverse proteins in complex proteomes, as well as compositions for performing the method.