Thiazole Orange Molecular Sensor Torsional Motion Restriction
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Solution Overview
Problem
Developing sensitive and selective fluorescent molecular sensors for protein detection is challenging due to background signal issues and low affinity binding, especially for protein isoforms, which limits their effectiveness in detecting proteins at low concentrations and in native environments.
Innovation Solution
A novel class of fluorescent molecular sensors based on Thiazole Orange derivatives with selective protein binders that restrict torsional motion upon protein binding, enhancing fluorescence emission and allowing for high-affinity, isoform-specific detection of proteins like GSTs, AChE, and His-tagged proteins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If common fluorescence signaling mechanisms (PET, CT, FRET) are used in molecular sensors, then fluorescence emission can be generated, but background emission signal is produced leading to reduced sensitivity
Solution Approach 1:
The patent changes the fundamental parameter of fluorescence generation from electronic transitions (PET, CT, FRET) to mechanical restriction of torsional motion. The sensor is designed to be non-fluorescent in the unbound state, generating fluorescence only when torsional motion is restricted upon protein binding, thereby eliminating background signal while maintaining sensitivity.
Solution Approach 2:
Instead of using conventional approaches where the sensor emits fluorescence continuously or through electronic transitions, the patent inverts the approach by using a sensor that is non-fluorescent by default and only becomes fluorescent when bound to the target protein. This inversion eliminates background emission and improves signal-to-noise ratio.
2Reliability
If molecular sensors are designed to bind protein targets, then protein detection is enabled, but binding affinity is insufficient for detecting proteins at low concentrations
Solution Approach 1:
The patent creates a composite molecular sensor combining a fluorescent dye (Thiazole Orange) with protein-binding moieties (aptamers, peptides, or small molecules). This composite structure integrates the fluorescence emission capability with high-affinity protein binding, enabling sensitive detection of proteins at low concentrations through the synergistic effect of the combined components.
3Reliability
If molecular sensors are developed for protein detection, then protein identification is achieved, but selectivity among protein isoforms is insufficient
Solution Approach 1:
The patent applies local quality by designing protein-binding moieties with specific structural and chemical properties that enable selective recognition of particular protein isoforms. The aptamers, peptides, or small molecules are engineered with specific binding sites that differentiate between isoforms based on their unique structural features, achieving high selectivity while maintaining detection capability.
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
These sensors achieve significant fluorescence enhancement upon protein binding with minimal background signal, enabling sensitive and selective detection of proteins at low concentrations and in complex environments, including living cells.
Implementation Method 1
the emission of Thiazole Orange (TO) is quenched due to excited state twisting of benzothiazole and quinoline rings around the methine bridge, which leads to a non-radiative decay. Binding to DNA or peptide aptamers, or interchelation into DNA duplexes restricts this torsional motion and leads to an enhanced fluorescence signal.
Data Source
AI summary
The present invention is directed to fluorescent molecular sensor based on Thiazole Orange for protein detection. Interaction of the protein target with the molecular sensors of this invention results in a significant increase in the fluorescence emission. The generation of light output signal enables one to detect protein biomarkers associated with different diseases or detecting the protein of interest also in living cells.