Viscosity-Responsive Fluorescent Probe for Fast, Specific Protein Labeling
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Solution Overview
Problem
Current fluorescent protein labeling methods suffer from slow maturation, aggregation, and photostability issues, and chemical tag technologies face non-specific fluorescence emission and increased molecular volume, limiting real-time tracking and detection in complex environments.
Innovation Solution
A viscosity-responsive fluorescent probe is designed with a ligand moiety, linker moiety, and fluorescent dye moiety, featuring an electron donor and acceptor system, which activates fluorescence upon binding to a protein tag, enhancing intensity and specificity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FRET mechanism with quenching group is used to activate fluorescence upon binding, then fluorescence specificity is improved, but molecular volume increases and labeling speed decreases
Solution Approach 1:
The patent removes the quenching group from the probe molecule entirely, replacing the FRET mechanism with a different approach. The probe uses a chemically reactive group that forms a covalent bond with the target protein, and fluorescence activation is achieved through a different mechanism that does not require a quenching group, thus reducing molecular volume and increasing labeling speed while maintaining specificity
Solution Approach 2:
The patent changes the fundamental mechanism from FRET-based quenching to a different fluorescence activation approach. By altering the working principle and removing the quenching group, the molecular volume is reduced and labeling kinetics are improved while fluorescence specificity is maintained through the unique binding characteristics of the probe design
2Illumination intensity
If polar-sensitive probes are used to detect proteins in cells, then fluorescence enhancement occurs in non-polar pockets, but background interference increases due to varying polarity in different organelles
Solution Approach 1:
The patent divides the probe into distinct functional modules: a recognition element for specific protein binding and a fluorophore for signal generation. This segmentation allows the probe to achieve specific binding through the recognition element while the fluorophore provides consistent fluorescence signal regardless of local polarity variations, thereby reducing background interference from different organelles
Solution Approach 2:
The patent introduces a specific binding moiety as an intermediary between the probe and target protein. This binding element provides high specificity and anchors the probe to the target, while the fluorophore responds to binding through a mechanism that is not overly sensitive to polarity changes, thus reducing background interference from varying organelle environments
3Reliability
If chemical tag technology is used for specific protein labeling, then labeling specificity is improved, but background fluorescence from free probes increases
Solution Approach 1:
The patent employs a probe with a chemically reactive group that is designed to react specifically with the target protein under physiological conditions. The probe maintains low fluorescence in its unbound state and activates fluorescence only upon successful binding and reaction with the target, thereby eliminating background fluorescence from free probes while maintaining high labeling specificity
Solution Approach 2:
The patent utilizes a fluorescence activation mechanism that changes the fluorescence parameter based on binding status. The probe exhibits suppressed fluorescence when free and activated fluorescence when bound to the target protein, creating a clear signal distinction that eliminates background interference while maintaining high labeling specificity through the unique binding characteristics
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
The probe achieves specific labeling, rapid activation, and high fluorescence intensity, enabling real-time tracking and detection of proteins in complex environments without background interference, suitable for applications in cells, tissues, and living organisms.
Implementation Method 1
The fluorescent dye moiety C is a viscosity-responsive fluorescent dye which comprises an electron donor portion D, a conjugated system E and an electron acceptor moiety
Implementation Method 2
The fluorescent dye moiety C is a viscosity-responsive fluorescent dye which comprises an electron donor portion D, a conjugated system E and an electron acceptor moiety
Data Source
AI summary
Provided are a fluorescent probe, a preparation method therefor and a use thereof. The fluorescent probe responds to viscosity sensitively and specifically, can be used for the specific fluorescence labeling of proteins and can also be used in the quantification, detection or kinetic study of proteins and the imaging of cells, tissues and living bodies.