Covalent Aptamer Electrophilic Warhead Protein Conjugation
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Solution Overview
Problem
Current methods for targeted covalent modification and detection of proteins in complex biological settings are limited, particularly in achieving specific and efficient protein conjugation and diagnosis.
Innovation Solution
Development of covalent aptamers, engineered nucleic acid-based protein ligands that can covalently transfer or crosslink handles to target proteins, utilizing electrophilic leaving groups and handles such as biotin or fluorescent markers, enabling specific protein modification and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional metabolic labeling or activity-based probes are used for protein modification, then protein conjugation can be achieved, but specificity and efficiency are limited in complex biological settings
Solution Approach 1:
The invention divides the protein modification system into two distinct components: an aptamer that provides target-specific recognition and binding, and an electrophilic warhead that provides covalent modification capability. This segmentation allows each component to optimize its function independently, with the aptamer ensuring high specificity through sequence-selective binding and the electrophile ensuring high efficiency through irreversible covalent bond formation with nucleophilic residues.
Solution Approach 2:
The aptamer acts as an intermediary that bridges the gap between the electrophilic warhead and the target protein. It positions the electrophile in close proximity to the target protein through high-affinity binding, enabling the electrophile to react efficiently with nucleophilic residues while maintaining exquisite target specificity that neither component could achieve alone.
2Measurement precision
If covalent modification is used to improve detection sensitivity, then detection precision improves, but the complexity of the method increases
Solution Approach 1:
The invention merges the target recognition function of aptamers with the covalent modification function of electrophilic probes into a single integrated conjugate. This unified approach combines the advantages of both methods: the high specificity of aptamer binding with the enhanced detection sensitivity of covalent labeling, while simplifying the overall methodology compared to using separate recognition and modification steps.
3Measurement precision
If fusion proteins or peptide tags are used for detection, then detection capability is improved, but the complexity of protein engineering increases
Solution Approach 1:
Instead of modifying the target protein with fusion tags or peptide sequences (which requires protein engineering), the invention uses synthetic aptamers that can be selected against the native protein through SELEX. This approach creates a detectable copy or surrogate (the aptamer) that binds to the target protein without requiring any modification of the protein itself, thereby maintaining the native protein's structure and function while enabling detection.
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 selective and efficient protein modification, detection, and diagnosis of diseases such as coronavirus infections and cancer, with improved specificity and sensitivity compared to traditional methods.
Implementation Method 1
engineered, nucleic acid-based protein ligands that either covalently transfer a handle or covalently crosslink to their target
Implementation Method 2
nucleic acid-based protein ligands that either covalently transfer a handle or covalently crosslink to their target
Data Source
AI summary
Disclosed are chemically modified aptamers comprising an electrophilic group and a handle and methods for using said aptamers to deliver the handle to a target protein, crosslink the aptamer to the target protein, as well as methods of using said aptamers to detect proteins and to treat viral infections or cancer.