1,2-Cyclohexanedione Conjugation for Stable Biomolecule Labeling
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Solution Overview
Problem
Existing methods for attaching linking groups, labels, and fluorogenic probes to biological molecules like peptides and nucleic acids are not selective and efficient enough, particularly under mild conditions suitable for complex biological systems, leading to instability and functional loss of the molecules.
Innovation Solution
The use of 1,2-cyclohexanedione (CHD) groups in combination with orthogonal reactive handles, such as click chemistry reactants, under reaction conditions of pH 13 or less in an aqueous medium, facilitates irreversible and selective conjugation of biomolecules, preserving their integrity and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing methods are used to attach linking groups, labels, and fluorogenic probes to biological molecules, then the attachment can be achieved, but the selectivity and efficiency are insufficient, leading to instability and functional loss of the molecules
Solution Approach 1:
The patent employs parameter changes by utilizing pH-controlled reaction conditions (pH 13 or less) to enable selective conjugation. The CHD group reacts specifically with CHD-reactive groups under these controlled pH conditions, providing both high selectivity and efficiency while maintaining biomolecule stability and functionality.
2Reliability
If mild reaction conditions are used to preserve biomolecule integrity, then the stability of biomolecules is maintained, but the reaction efficiency and selectivity are reduced
Solution Approach 1:
The patent resolves this contradiction by optimizing reaction parameters, specifically using pH 13 or less conditions that are mild enough to preserve biomolecule integrity while still enabling efficient and selective conjugation through the CHD-CHD-reactive group reaction mechanism.
Solution Approach 2:
The CHD group serves as a specialized reactive handle that mediates the conjugation reaction under mild conditions. This intermediary approach allows the reaction to proceed efficiently at pH 13 or less without requiring harsh conditions that would compromise biomolecule stability.
3Productivity
If high pH conditions are used to achieve irreversible reaction of CHD with CHD-reactive groups, then the conjugation is efficient and irreversible, but the biomolecules become unstable and lose functionality
Solution Approach 1:
The patent directly addresses this contradiction by establishing that pH 13 or less conditions are sufficient to achieve irreversible and efficient conjugation between CHD and CHD-reactive groups, eliminating the need for higher pH conditions that would compromise biomolecule stability.
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 enables efficient and stable conjugation of biomolecules, allowing for downstream applications like polypeptide sequencing by providing a bioorthogonal chemistry that maintains the integrity and functionality of peptides and nucleic acids.
Implementation Method 1
contacting the conjugation reagent with the target molecule under reaction conditions that cause the CHD-reactive group to react irreversibly with the CHD group to form a modified target molecule having a covalent linkage connecting the conjugation reagent and the target molecule
Data Source
AI summary
The present invention relates to methods to use cyclohexan-1,2-dione (CHD) groups to attach labels, linkers, and other molecules to a target compound comprising a CHD-reactive group such as a guanidine, amidine, urea, thiourea and the like. Methods of the invention include milder conditions than those previously known for promoting reaction of CHD with CHD-reactive groups, which makes the methods suitable for use with base-sensitive compounds and complex biomolecules. Methods of the invention are especially useful for attaching linking and labeling groups to a peptide that comprises at least one arginine residue, and can also be used to link such peptides to other target molecules such as nucleic acids. The invention also provides CHD-containing conjugation reagents and compositions comprising CHD-containing intermediates, and precursors useful for making CD-containing compounds that can be used in the methods of the invention.