Multiplexed Mass Spectrometry for Off-Target Binding Evaluation
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Solution Overview
Problem
Current methods for characterizing the binding of compounds to target molecules, such as mass spectrometry, face challenges in efficiently determining the affinity and off-target binding of ligands to receptor molecules, particularly in multiplexed assays involving multiple target molecules.
Innovation Solution
A multiplexed method using mass spectrometry that involves obtaining target molecules from human or non-human tissues, incubating them with ligands and test compounds, removing unbound ligands, isolating bound ligands, and determining their quantity using a calibration curve, to assess the affinity of test compounds to specific and off-target molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mass spectrometry is used to determine ligand binding to target molecules, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple target molecules into a single multiplexed assay system that can be analyzed simultaneously by mass spectrometry. This merging approach maintains high measurement precision for binding affinity determination while reducing overall device complexity by eliminating the need for separate assays for each target molecule.
Solution Approach 2:
The mass spectrometry system is configured to perform multiple functions: detecting binding to multiple different target molecules, quantifying binding affinity, and identifying off-target effects all within a single analytical platform. This multi-functionality improves measurement precision across multiple targets while avoiding the complexity of multiple specialized devices.
2Productivity
If multiplexed assays with multiple target molecules are performed, then productivity is improved, but device complexity increases
Solution Approach 1:
Multiple target molecule evaluations are merged into a single multiplexed assay that can be processed simultaneously. This approach increases productivity by evaluating multiple targets in parallel while managing device complexity through a unified assay protocol and single mass spectrometry analysis.
Solution Approach 2:
The multiplexed assay segments the detection of different target molecules by using distinct mass spectral signatures or fragmentation patterns for each target-ligand complex. This segmentation allows simultaneous measurement of multiple targets without requiring physically separate systems, thus improving productivity while controlling complexity.
3Reliability
If off-target binding evaluation is performed, then reliability is improved, but measurement precision requirements increase
Solution Approach 1:
The evaluation of both on-target and off-target binding is merged into a single multiplexed mass spectrometry assay. This approach improves reliability of drug safety assessment by simultaneously detecting binding to multiple targets, while the inherent sensitivity of mass spectrometry maintains the required measurement precision for detecting varying binding affinities.
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 method enables the simultaneous evaluation of binding affinity to multiple target molecules, providing a comprehensive binding profile and identifying potential off-target effects, thereby enhancing the safety and efficacy of drug candidates.
Implementation Method 1
determining a quantity of ligand that was bound by a target molecule, by measuring ligands that were obtained in step (d), using mass spectrometry
Data Source
AI summary
Provided are multiplexed methods for characterizing binding of a test compound to different receptor target molecules using mass spectroscopy techniques. The methods employ receptor molecules that have different functions or found in different tissues, such as cerebral cortex, cerebellum, ventricular and hepatic membrane preparations. The methods enable determination of undesirable off-target binding of a test compound. The methods comprise incubation of a heterologous mixture of different receptor target molecules with ligands (known binders), and a test compound. Various wells contain different amounts of molecules for use in construction of concentration curves. Next, unbound ligands are separated from the well contents. Next, ligands that were bound to the receptors are separated. An LC/ESI-MS/MS method may be used to reduce irrelevant mass spectroscopy peaks. Binding of the test compound to a desired receptor target molecule is compared to binding of the test compound to other receptor target molecules, i.e., off-target binding.