Quinone-Forming Phenolic Probes for Stable Cell Marking
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Solution Overview
Problem
Current marking methods for biological structures, especially cells, often rely on non-covalent bonds that are unstable, leading to high background signals and require high concentrations of marking molecules, which is not feasible for precise and gentle marking, especially for intact cells.
Innovation Solution
A method involving a compound with dihydroxy- or trihydroxyphenyl groups that are oxidized to quinone, allowing for a covalent bond formation at controlled concentrations to prevent unwanted dimerization or polymerization, using enzymes like laccase to facilitate the reaction under mild conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-covalent bonds are used for marking biological structures, then the marking can be performed with simple probes, but the bond stability is insufficient leading to high background signals and requiring high concentrations of marking molecules
Solution Approach 1:
The patent changes the chemical bonding parameter from non-covalent to covalent bonds by using oxidizable phenolic groups that form irreversible covalent bonds with amino groups on target structures. This parameter change resolves the contradiction by achieving both simple marking methodology and high bond stability through the formation of stable covalent linkages.
Solution Approach 2:
The patent introduces an intermediary oxidation step that converts phenolic groups to quinone groups, which then form covalent bonds with target structures. This intermediary mechanism enables the formation of stable covalent bonds while maintaining the simplicity of the overall marking process, as the oxidation step is catalyzed by commonly used enzymes.
2Measurement precision
If high concentrations of marking molecules are used to achieve desired marking results with non-covalent bonds, then the marking signal can be sufficient, but the background signal increases
Solution Approach 1:
The patent uses low molecular weight phenolic compounds that can be easily introduced and removed, replacing the need for high concentrations of marking molecules. These simple phenolic probes form stable covalent bonds at low concentrations, eliminating the background signal problem while maintaining sufficient marking signal strength.
3Reliability
If covalent bonds are formed to ensure stable marking, then the complex stability is improved, but the marking method becomes more complex requiring multiple steps
Solution Approach 1:
The patent employs self-service by using enzymes that are naturally present or commonly added to the system to catalyze the oxidation step. The phenolic groups automatically oxidize to quinone groups in the presence of the target structure, forming covalent bonds without requiring complex activation steps or additional reagents, thus maintaining simplicity while achieving stable covalent marking.
4Reliability
If reactive functional groups are produced to enable covalent bonding, then the marking stability is improved, but the process requires additional activation steps and purification
Solution Approach 1:
The patent applies preliminary action by incorporating the phenolic groups directly into the marking molecule during synthesis, eliminating the need for separate activation steps. The phenolic groups are pre-installed and ready to oxidize and form covalent bonds upon contact with the target structure, simplifying the overall process while ensuring stable marking.
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 method enables specific, stable, and gentle covalent marking of cell structures without loss of integrity, achieving high binding rates and reducing background signals, allowing for precise marking and isolation of cell types.
Implementation Method 1
oxidation of this group to the quinone
Implementation Method 2
an oxidation of the dihydroxy- or trihydroxyphenyl group takes place (preferably via an enzyme)
Implementation Method 3
a compound V containing a dihydroxy- or trihydroxyphenyl group is covalently bonded to a target structure by oxidation of this group to the quinone
Data Source
AI summary
Method for marking a target structure, comprising the following steps:a) providing a compound V that includes at least one dihydroxy- or trihydroxyphenyl group,b) providing a means for converting the dihydroxy- or trihydroxyphenyl group to a quinone group,c) providing a target structure,d) oxidizing the dihydroxy- or trihydroxyphenyl group of the compound V to the quinone group, ande) contacting the compound V with the target structure, so that a covalent bond can be formed,whereinin step e) the compound V is used in a concentration such that the maximum concentration of dihydroxy-, trihydroxyphenyl groups and quinone groups that are introduced by the compound V is ≦500 μM, preferably ≦300 μM, and more preferably ≦100 μM.