N3-Kethoxal RNA Labeling for Live-Cell Structure Mapping
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Solution Overview
Problem
Existing chemical probes for RNA secondary structure mapping, such as DMS and SHAPE, are toxic, non-specific, or hydrolytically unstable, necessitating the development of a safer and more efficient method for in vivo labeling of Watson-Crick base pairing interfaces.
Innovation Solution
The use of N3-kethoxal or kethoxal derivatives that selectively label single-stranded guanine bases in live cells, enabling fast and reversible labeling for transcriptome-wide RNA secondary structure mapping and RNA G-quadruplex prediction, combined with click chemistry for functionalization and enrichment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DMS is used for RNA labeling, then labeling efficiency is improved, but toxicity increases and specificity decreases
Solution Approach 1:
The patent uses small molecule chemical probes (kethoxal derivatives) that are non-toxic and can be rapidly cleared from cells, replacing the toxic and persistent DMS reagent. These disposable-like probes achieve labeling without long-term harmful effects.
Solution Approach 2:
The invention changes the chemical parameters of the labeling reagent from DMS (methylating agent) to kethoxal derivatives (reactive with Watson-Crick interfaces). This parameter change maintains labeling efficiency while eliminating toxicity and improving specificity for RNA secondary structure mapping.
2Speed
If SHAPE molecules are used for RNA labeling, then labeling speed is improved, but hydrolytic stability decreases
Solution Approach 1:
The patent employs small molecule kethoxal derivatives that perform rapid labeling and are then removed or inactivated, replacing the hydrolytically unstable SHAPE reagents. The labeling function is achieved quickly without requiring long-term stability of the probe itself.
Solution Approach 2:
The invention extracts the essential labeling function from unstable SHAPE molecules and transfers it to stable kethoxal derivatives. The unstable components of SHAPE are discarded, retaining only the rapid labeling capability in a chemically stable format.
3Quantity of substance
If DMS is used for RNA labeling, then labeling coverage is improved, but specificity decreases due to non-specific methylation
Solution Approach 1:
The patent applies local quality by designing kethoxal derivatives that react specifically at Watson-Crick base pairing interfaces rather than uniformly across all RNA bases. This localized reactivity provides both broad coverage of structured regions and high specificity for biologically relevant interactions.
Solution Approach 2:
The invention changes the chemical reactivity parameters from DMS's non-specific alkylation to kethoxal's specific reaction with Watson-Crick interfaces. This parameter change enables broad coverage of RNA structures while maintaining high specificity for functionally important base pairing regions.
4Measurement precision
If complex RNA handling procedures are used, then mapping accuracy is improved, but operational complexity increases
Solution Approach 1:
The patent enables self-service by using cell-permeable kethoxal derivatives that perform labeling directly inside live cells without requiring RNA extraction, purification, or complex handling. The system serves itself by completing the labeling function in situ, simplifying the workflow while maintaining accuracy.
Solution Approach 2:
The invention extracts the labeling function from complex RNA handling procedures and performs it directly in live cells. By taking out the labeling step from the complex workflow and making it independent and simple, the patent maintains mapping accuracy while dramatically reducing operational complexity.
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
Provides a user-friendly, high-throughput method for genome-wide mapping of single-stranded DNA and RNA interactions, allowing for the study of RNA secondary structures and RNA-protein interactions without the need for RNA handling, suitable for both research and clinical applications.
Implementation Method 1
N3-kethoxal or click chemistry kethoxal derivatives ('kethoxal derivatives') have been developed that efficiently label single-stranded DNAs and/or RNAs in live cells by reacting with the Watson-Crick interface of guanine bases
Implementation Method 2
The labelling product can be further functionalized and enriched, for example using biotin/biotin binding partner
Data Source
AI summary
Embodiments are directed to N3-kethoxal reagents and derivatives thereof, and related methods that allow fast and reversible labeling of single-stranded nucleic acids in live cells. By way of example, one aspect is directed to a process for reversible labeling of single-stranded guanine bases in live cells, which results in an effective in vivo method for transcriptome-wide RNA secondary structure mapping and RNA G-quadruplex prediction.