Viscosity-Responsive Fluorescent Probe for Fast Protein Labeling
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Solution Overview
Problem
Current fluorescent protein labeling methods, such as those using SNAP-tag and CLIP-tag, suffer from non-specific fluorescence emission by both labeled and unlabeled probes, limiting their application in situations requiring speed and specificity, and existing probes have issues with photostability, molecular volume, and polarity sensitivity.
Innovation Solution
A fluorescent probe design incorporating a ligand moiety linked to a viscosity-responsive fluorescent dye with an electron donor and acceptor system, which activates fluorescence upon binding to a protein tag, providing rapid labeling, high brightness, and resistance to bleaching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FRET mechanism is used to design fluorescent-activated probe, then fluorescence activation is achieved, but molecular volume increases and labeling speed decreases
Solution Approach 1:
The patent extracts and removes the quenching group from the probe structure, using only the fluorescent dye and ligand portions. This eliminates the volume penalty associated with FRET-based quenching groups while maintaining fluorescence activation through an alternative mechanism (direct environmental sensing upon binding).
Solution Approach 2:
The patent changes the activation mechanism from FRET-based energy transfer to environmental sensitivity-based activation. The probe uses changes in local environment (hydrophobicity, polarity) upon binding to trigger fluorescence activation, avoiding the need for large quenching groups and enabling faster labeling kinetics.
2Reliability
If FRET mechanism is used to design fluorescent-activated probe, then fluorescence activation is achieved, but photostability deteriorates
Solution Approach 1:
The patent removes the quenching group component entirely from the probe structure, eliminating the FRET mechanism and its associated photostability problems. The simplified probe structure consisting only of fluorescent dye and ligand shows improved photostability while maintaining activation capability through environmental sensing.
3Measurement precision
If chemical tag technology is used for fluorescent labeling, then specificity is improved, but background interference increases due to non-characteristic fluorescence emission
Solution Approach 1:
The patent implements a dynamic fluorescence activation mechanism where the probe transitions from non-fluorescent or weakly fluorescent state to highly fluorescent state upon binding to the target protein tag. This dynamic switching capability enables the probe to maintain high specificity while minimizing background interference from unbound probes.
Solution Approach 2:
The patent utilizes fluorescence intensity changes (analogous to color changes) as the probe binds to the target. The bound probe exhibits strong fluorescence while the unbound probe remains dark or weak, creating a high contrast signal that improves measurement precision and reduces background interference.
4Speed
If viscosity-responsive fluorescent dye is used with ligand moiety directly connected, then labeling speed increases, but molecular structure complexity increases
Solution Approach 1:
The patent merges the viscosity-responsive fluorescent dye and the ligand moiety into a single integrated probe structure with direct covalent connection. This merging eliminates the need for separate components and linkers, simplifying the overall molecular structure while maintaining rapid labeling kinetics through the inherent properties of the combined structure.
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 protein labeling with enhanced fluorescence intensity, rapid labeling speed, and wide applicability, suitable for real-time tracking and detection in complex environments.
Implementation Method 1
the fluorescent dye moiety is a viscosity-responsive fluorescent dye which comprises an electron donor portion D, a conjugated system B 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 sensitively and specifically responds to viscosity, and can be used for the specific fluorescence labeling of proteins as well as in the quantification, detection or kinetic study of proteins and the imaging of cells, tissues and living bodies.