Chromophore Compositions Stabilizing Fluorescent Dyes in Aqueous Media
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Solution Overview
Problem
Current fluorescent labeling techniques face challenges in achieving stable and efficient fluorescence in aqueous environments, particularly with environmentally sensitive dyes that exhibit low solubility and poor fluorescence properties in these conditions.
Innovation Solution
The development of chromophore compositions that encapsulate fluorescent dyes within the apo form of heme-proteins, such as myoglobin or hemoglobin, using crosslinking reagents to stabilize the dye within the protein's binding cavity, enhancing fluorescence intensity and resistance to displacement by hemin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If environmentally sensitive dyes are used in aqueous environments, then fluorescence intensity should be high, but the dyes exhibit low solubility and poor fluorescence properties
Solution Approach 1:
The patent uses apo-heme proteins as intermediary carriers to solubilize and protect environmentally sensitive dyes in aqueous environments. The protein binding cavity acts as a mediator that provides a hydrophobic pocket for the dye while maintaining aqueous solubility of the overall complex, thereby enabling high fluorescence intensity without aggregation or precipitation in water-based systems.
Solution Approach 2:
The patent changes the environmental parameters by transitioning the dye from direct aqueous exposure to a protected state within the protein cavity. This parameter change includes altering the local microenvironment (from hydrophobic to hydrophilic interface) and physical state (from aggregated to monomeric), which stabilizes fluorescence properties in aqueous solutions.
2Reliability
If crosslinking reagents are used to stabilize dye within protein binding cavity, then resistance to displacement by hemin increases, but the complexity of the procedure increases
Solution Approach 1:
The patent extracts the heme group from the heme-protein to create an apo-protein form, which then selectively binds the fluorescent dye in the vacant binding cavity. This extraction approach allows the dye to occupy the position normally held by heme, creating a stable complex that resists displacement by hemin while simplifying the overall procedure by using a single binding event rather than multiple stabilization steps.
3Strength
If genetically modified proteins are used to increase dye affinity, then binding strength increases, but the difficulty of protein production increases
Solution Approach 1:
The patent changes the chemical parameters of the binding interface by replacing histidine residues with cysteine residues at specific positions in the protein sequence. This parameter change (amino acid substitution) creates new binding interactions between cysteine thiol groups and the dye molecule, significantly increasing binding affinity while maintaining compatibility with standard recombinant protein expression systems.
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 approach significantly increases the fluorescence intensity of environmentally sensitive dyes in aqueous solutions, providing a stable and efficient labeling method for biological samples, even in the presence of competing hemin molecules.
Implementation Method 1
reacting the dye-protein complex with a crosslinking reagent to encapsulate or lock the dye in the protein
Implementation Method 2
fluorescent dyes showing intense fluorescence, typically in the red and near infrared region (absorption maxima are found between 630 and 670 nm and their emission maxima are between 650-700 nm)
Data Source
AI summary
Chromophore compositions and methods of making and using the same are provided. Aspects of the chromophore compositions include a chromophore component having a chromophore, such as a fluorescent dye moiety, stably associated with a prosthetic group binding cavity of a metalloprotein. Also provided are methods of making, methods of use, systems and kits related to the subject fluorescent compositions.