Bioactive Agent Capture Ligand for Specific Target Identification
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Solution Overview
Problem
Current methods for discovering and validating protein targets of bioactive small molecules face challenges such as weak binding kinetics on solid surfaces, non-specific protein binding, and high background noise in mass spectrometry, leading to resource-intensive validation processes and numerous false positives.
Innovation Solution
The use of bioactive agents tethered to capture ligands, combined with capture proteins and surfaces displaying capture ligands, allows for covalent bonding and specific capture of cellular targets, enabling efficient and sensitive identification of protein targets through covalent interactions and reduced non-specific binding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If affinity enrichment methods use solid support immobilized with candidate small molecule, then the method enables target capture, but the binding kinetics become much slower and non-specific binding increases
Solution Approach 1:
The patent introduces a capture ligand as an intermediary between the solid support and the target protein. The capture ligand specifically binds to the target protein, while the solid support provides mechanical stability. This mediator approach enables specific target capture without the slow non-specific binding to solid surfaces, resolving the contradiction between capture reliability and binding speed.
Solution Approach 2:
The patent extracts the specific binding function from the solid support by using a capture ligand that selectively binds to the target protein. The solid support is used only for mechanical stability, while the capture ligand handles the specific interaction. This separation allows fast specific binding kinetics while maintaining reliable target capture.
2Adaptability or versatility
If affinity enrichment methods are used with moderate to weak binding between small molecule and protein target, then the method can identify potential targets, but the results are biased towards high affinity interactors and background noise increases
Solution Approach 1:
The capture ligand acts as an intermediary that enhances the detection of moderate to weak binding interactions. By using a capture ligand with high specificity and affinity for the target protein, the system can detect targets with moderate to weak small molecule binding without being biased toward only high affinity interactors, while the bioluminescent reporter enables precise measurement.
Solution Approach 2:
The patent uses bioluminescent reporters that produce light signals when bound to target proteins. This optical signal provides high measurement precision for detecting target-protein interactions, enabling accurate identification of targets across a wide range of binding affinities without being limited to only high affinity interactors.
3Measurement precision
If secondary screens are run to validate potential targets, then the validation accuracy improves, but the process becomes resource intensive
Solution Approach 1:
The assay system is self-contained, with all validation components (capture ligand, capture protein, bioluminescent reporter) integrated into a single assay. This eliminates the need for separate secondary screens, allowing high-throughput validation without sacrificing accuracy. The system performs both detection and validation in one step, improving productivity while maintaining measurement precision.
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 facilitates rapid and specific capture of cellular targets, minimizing complex collapses and non-specific interactions, thereby enhancing the detection of low-affinity targets and reducing background noise, making the validation process more efficient and accurate.
Implementation Method 1
the first capture ligand forms a covalent bond with the first capture protein upon interaction thereof
Data Source
AI summary
The present invention provides compositions and methods for capture and identification of the cellular targets of a bioactive agent. In particular, provided herein are bioactive agents tethered to capture ligand, cellular targets (optionally tagged with a reporter), capture proteins (optionally present as capture dimers), surfaces (e.g., displaying, capture ligands, capture proteins, or capture dimers), and methods of capturing and identifying the cellular targets of a bioactive agent therewith.