Dynamic Biosensor Mediator Receptor Switching
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Solution Overview
Problem
Existing biosensors face challenges in detecting low-concentration analytes in complex biological matrices with high specificity and speed, due to slow response times and accuracy issues related to binding affinities and environmental variations.
Innovation Solution
A biosensor system utilizing a mediator-receptor pair with fast off-rates and dynamic binding properties, allowing for real-time calibration and modular detection of different analytes, where the mediator binds to the analyte-receptor with high motional freedom or is tethered to maintain proximity, generating time-dependent signals indicative of analyte presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If recognition molecules with strong binding affinities are used, then specificity is improved, but response time deteriorates due to extended blocking times
Solution Approach 1:
The recognition molecule is segmented into two functional parts: a mediator that binds reversibly to the probe with fast off-rates, and a receptor that binds to the analyte. This segmentation allows the mediator to quickly release and allow repeated binding events, improving response time while maintaining specificity through the receptor- analyte interaction.
Solution Approach 2:
A mediator molecule is introduced as an intermediary between the probe and the analyte-receptor complex. The mediator binds to the probe with high affinity but fast off-rates, enabling rapid exchange and statistical accumulation, while the analyte-receptor complex provides the specific binding function. This intermediary resolves the contradiction by decoupling the binding affinity requirement from the response time requirement.
2Measurement precision
If strong binding affinities are used, then detection accuracy is improved, but reliability deteriorates due to misinterpretation of signal variations
Solution Approach 1:
The mediator-probe binding is designed to be dynamic with fast off-rates, creating a reversible equilibrium that allows the system to adapt to environmental variations. This dynamic behavior enables real-time calibration and distinguishes true binding events from noise, improving both detection accuracy and reliability.
Solution Approach 2:
The system incorporates real-time calibration through the dynamic mediator binding, where the mediator's fast off-rate allows continuous monitoring and adjustment of baseline characteristics. This feedback mechanism compensates for environmental variations and prevents misinterpretation of signal changes, enhancing reliability while maintaining accuracy.
3Measurement precision
If single-molecule detection is used, then sensitivity is improved, but device complexity increases due to need for novel coupling procedures
Solution Approach 1:
The mediator-probe coupling mechanism is designed to be universal and reusable, eliminating the need for novel coupling procedures for each analyte. The mediator can be exchanged with different analyte-receptor complexes while maintaining the same fast off-rate binding characteristics, reducing device complexity while preserving single-molecule detection sensitivity.
Data Source
AI summary
An analyte in a matrix is sensed using a sensing device having a detection probe conjugated to a mediator-receptor that is not a binder for the analyte. The sensor device is provided with mediators conjugated to analyte-receptors, where the mediators are selected to bind to the mediator-receptors, and where the analyte-receptors are selected to bind to the analyte. In some embodiments, the mediators are bound to the detection probe by a tether molecule, or tether molecule fragment, or tether domain. In other embodiments, the mediators are not bound to the detection probe. The presence of the analyte is detected by optically or electrically detecting changes of distance between the mediators and the mediator-receptor, indicative of association and/or dissociation events between mediators and mediator-receptor, the characteristics of which are affected by whether the analyte is bound to the analyte-receptor.