Furan-Modified Ligand Covalent Binding to Cell Surface Proteins
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Solution Overview
Problem
Current methods for detecting and identifying cell surface proteins or ligands, particularly those using bio-orthogonal chemistries like furan-based crosslinking, require exogenous activation signals, which can be toxic and limit their application in living cells, and often suffer from low specificity and sensitivity.
Innovation Solution
A method that allows covalent binding of cell surface proteins and ligands without the need for exogenous activation signals, using a ligand with a furan moiety that can bind to living cells and form a covalent complex under physiological conditions, enabling efficient and specific identification of target proteins and their binding sites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If exogenous activation signals (e.g., UV light, chemical oxidants) are used to activate furan-based crosslinking, then covalent binding between ligand and cell surface protein is achieved, but cell toxicity increases and applicability to living cells is limited
Solution Approach 1:
The patent converts the normally harmful exogenous activation signals into endogenous physiological processes. Instead of using toxic UV light or chemical oxidants, the invention utilizes endogenous cellular oxidation systems (such as hydrogen peroxide produced during normal cellular metabolism) to activate the furan moiety. This transforms a harmful external intervention into a beneficial use of the cell's own physiological byproducts, achieving covalent crosslinking without external toxicity.
Solution Approach 2:
The ligand-modified furan moiety becomes self-activating within the cellular environment. The furan group naturally reacts with endogenous oxidants present in the cell, eliminating the need for external activation signals. This self-service mechanism allows the crosslinking process to occur autonomously within living cells, maintaining physiological conditions while achieving reliable covalent binding.
2Measurement precision
If traditional detection methods (antibodies, immunoassays) are used for cell surface proteins, then detection is possible, but specificity and sensitivity are often unsatisfactory and unknown proteins cannot be identified
Solution Approach 1:
The patent creates a universal detection platform that works for any cell surface protein regardless of whether antibodies are available. By using ligand-modified furan groups that covalently bind to the protein's natural ligand-binding site, the method provides a universal approach applicable to known and unknown proteins alike, overcoming the limitation of antibody-dependent methods.
Solution Approach 2:
The furan-modified ligand acts as an intermediary that bridges the gap between the target protein and detection methods. Instead of requiring direct antibody-protein interaction, the small molecule ligand with furan group serves as a mediator that covalently attaches to the protein, enabling subsequent detection through the attached ligand tag, thereby achieving high specificity without antibody limitations.
3Reliability
If photoaffinity crosslinking with benzophenones or aryl azides is used, then crosslinking can be achieved, but phototoxicity must be monitored and selectivity is reduced due to highly reactive intermediates
Solution Approach 1:
The patent changes the activation parameters from external UV light exposure to endogenous chemical oxidation. By shifting from photochemical activation to chemical oxidation using endogenous oxidants, the method eliminates phototoxicity while maintaining crosslinking capability. The furan moiety's oxidation potential is matched to physiological oxidant levels, enabling selective reaction without generating harmful reactive intermediates.
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 allows for efficient, specific, and non-toxic covalent binding of cell surface proteins and ligands, maintaining biological activity and providing a reliable alternative to antibodies for diagnostics and protein analysis, with improved sensitivity and specificity compared to existing methods.
Implementation Method 1
Furan, when incorporated in oligonucleotides, can be activated by oxidation using N-bromosuccinimide (NBS) or singlet oxygen
Implementation Method 2
covalently binding the cell surface protein and the ligand
Data Source
AI summary
The present invention relates to a method for covalently binding a cell surface protein and a ligand, the ligand being capable of specifically binding to the cell surface protein, the method consisting essentially of contacting the living cells expressing the cell surface protein with the ligand comprising at least one furan moiety, thereby covalently binding the cell surface protein and the ligand.