Cysteine Labelling Probes for E1-E2 Interaction Profiling
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Solution Overview
Problem
Current activity-based protein profiling (ABPP) lacks probes to effectively profile E1-E2 and E2-E3 interactions, which are crucial for understanding ubiquitin system regulation and enzyme function in native biological systems.
Innovation Solution
Development of activated E2 molecules capable of forming stable covalent bonds with E1 and E3 enzymes through a proximity-accelerated thiol addition reaction, using thioacrylonitrile or methyl thioacrylate groups, and other electron-deficient vinyl sulphides to create conjugate probes for detecting protein-protein interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If activity-based probes are developed for deubiquitinating enzymes, then characterization of deubiquitinating enzymes sub-proteome is achieved, but probes for E1-E2 and E2-E3 interactions are still unavailable
Solution Approach 1:
The probe is segmented into distinct functional modules: a recognition element (ubiquitin or ubiquitin-like modifier), a linker, and an electrophilic warhead (thioacrylonitrile or methyl thioacrylate group). This segmentation allows each component to perform its specific function while simplifying the overall design process and enabling modular optimization of probe properties for different E1-E2 and E2-E3 interactions
Solution Approach 2:
The probe design employs a universal scaffold that can be adapted to target multiple enzyme pairs in the ubiquitin system. The electrophilic warhead module is designed to react with catalytic cysteines in a universal manner, while the recognition element can be varied to target specific E1-E2 or E2-E3 interactions, making the probe platform universally applicable across different ubiquitin system components
2Reliability
If proximity-accelerated thiol addition reaction is used, then stable covalent bonds are formed with E1 and E3 enzymes, but selectivity for specific enzyme interactions must be ensured
Solution Approach 1:
The probe exhibits different chemical properties at different locations: the electrophilic warhead region is designed with high reactivity toward catalytic cysteines to ensure reliable covalent bond formation, while the recognition element region is designed with specific structural and chemical characteristics that confer selectivity for particular E1-E2 or E2-E3 interactions. This local differentiation of chemical properties allows simultaneous achievement of bond stability and interaction precision
Solution Approach 2:
The probe is designed to undergo preliminary non-covalent recognition and binding to the target enzyme complex before the covalent bond formation occurs. The recognition element first binds to the specific E1-E2 or E2-E3 interaction interface, positioning the electrophilic warhead in proximity to the catalytic cysteine, which then accelerates the thiol addition reaction. This preliminary action ensures both selectivity and efficiency
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 identification and characterization of E1-E2 and E2-E3 interactions, allowing for the investigation of ubiquitin system regulation and enzyme function, and potentially serving as drug lead structures for therapeutics.
Implementation Method 1
a proximity-accelerated thiol addition reaction between a thioacrylonitrile or methyl thioacrylate group on the activated E2 molecule and a juxtaposed catalytic cysteine residue present on an E1 and/or E3 enzyme
Data Source
AI summary
The present invention relates to the production of activated biological molecules for use in profiling biological molecule interactions. The activated biological molecule may be a ubiquitin (Ub) and ubiquitin-like conjugation enzyme as well as other proteins with internal reactive cysteine residues.