N3-Kethoxal Derivatives for Reversible Live-Cell RNA Labeling
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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 effective reagent for in vivo labeling of Watson-Crick base pairing interfaces.
Innovation Solution
N3-kethoxal derivatives are developed to reversibly label single-stranded guanine bases in live cells, enabling transcriptome-wide RNA secondary structure mapping and RNA G-quadruplex prediction through a simple 3-step protocol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DMS is used for RNA secondary structure mapping, then labeling efficiency is improved, but toxicity increases and specificity decreases
Solution Approach 1:
The patent changes the chemical parameters of the labeling reagent by developing kethoxal derivatives with modified molecular structures that reduce toxicity while maintaining reactivity with single-stranded RNA. The derivatives incorporate specific functional groups and molecular weight optimizations to achieve selective labeling without the harmful effects of DMS.
2Quantity of substance
If SHAPE molecules are used for RNA secondary structure mapping, then labeling coverage is improved, but hydrolytic stability decreases
Solution Approach 1:
The patent creates composite chemical structures by combining kethoxal core functionality with various stabilizing moieties and functional groups in the derivative molecules. This composite approach maintains the reactive capability for RNA labeling while incorporating structural elements that resist hydrolysis, thereby improving stability without sacrificing labeling coverage.
3Measurement precision
If kethoxal derivatives are used for RNA labeling, then specificity for single-stranded RNA is improved, but reagent complexity increases
Solution Approach 1:
The patent applies local quality by designing kethoxal derivatives with specific functional groups positioned at particular locations in the molecule to target single-stranded RNA structures. The derivatives incorporate selective recognition elements that interact with specific structural features of ssRNA, achieving high specificity while keeping the overall reagent design manageable through modular construction.
4Loss of information
If reversible labeling is implemented for RNA structure mapping, then information preservation is improved, but labeling stability decreases
Solution Approach 1:
The patent implements dynamic labeling by creating kethoxal derivatives that form reversible covalent bonds with RNA under physiological conditions. The labeling equilibrium can be shifted between bound and unbound states by changing conditions such as pH, temperature, or competitor concentration, allowing information preservation through reversible interaction while maintaining controlled stability during the measurement process.
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 N3-kethoxal derivatives provide a fast, non-toxic, and user-friendly method for RNA secondary structure mapping and G-quadruplex prediction, allowing for genome-wide mapping of single-stranded DNA and studying RNA interactions, with potential applications in research and clinical settings.
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
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.