DMT-MM Coupling Reagents for Nucleic Acid Labeling
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Solution Overview
Problem
Existing methods for labeling nucleic acids, particularly small chemically synthesized oligonucleotides and enzymatically amplified DNA strands, are inefficient and lack suitable alternatives to N-hydroxysuccinimide (NHS) ester chemistry, which is costly and not suitable for all types of nucleic acids.
Innovation Solution
The use of 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium (DMT-MM) salts as coupling reagents for post-synthetic modification of nucleic acids, specifically activating carboxy-modified labels with weakly-coordinating anions to react with amino-modified nucleic acids, allowing for efficient labeling with fluorescent dyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If NHS ester chemistry is used for labeling nucleic acids, then labeling efficiency is improved, but cost increases and suitability for certain nucleic acid types decreases
Solution Approach 1:
The patent replaces expensive NHS ester chemistry with a cheaper alternative coupling reagent system that uses readily available components (carboxylic acid, amine, and coupling reagent) to achieve labeling, eliminating the need for costly pre-activated NHS esters while maintaining labeling efficiency
2Productivity
If NHS ester chemistry is used for labeling nucleic acids, then labeling efficiency is improved, but compatibility with certain nucleic acid types deteriorates
Solution Approach 1:
The patent creates a universal labeling platform using carboxylic acid-amine coupling that works across diverse nucleic acid types (chemically synthesized oligonucleotides, enzymatically amplified DNA strands, and other nucleic acid variants) without requiring type-specific reagents, thereby achieving both efficiency and broad compatibility
3Measurement precision
If probe moieties are placed on ring positions to enable detection, then detection capability is improved, but enzymatic functionality deteriorates
Solution Approach 1:
The patent applies local quality by placing probe moieties at specific terminal positions (5' or 3' ends) of nucleic acids rather than on base ring positions, allowing detection functionality to be localized to regions that do not interfere with base pairing and enzymatic recognition, thus maintaining both detection capability and enzymatic functionality
4Manufacturing precision
If complex labeling methods are used to achieve site-specific labeling, then labeling precision is improved, but process complexity increases
Solution Approach 1:
The patent employs self-service through the inherent chemoselectivity of amine-carboxylic acid coupling reactions, where the nucleic acid's terminal amine group automatically reacts with the carboxylic acid label in the presence of coupling reagent without requiring complex protecting group strategies or multi-step synthesis protocols, achieving site-specific labeling with simple one-pot procedures
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
DMT-MM salts enable site-specific, efficient labeling of nucleic acids under mild conditions, maintaining the structural integrity and enzymatic functionality of the labeled nucleic acids, suitable for various lengths and types of oligonucleotides, enhancing detection sensitivity and hybridization compatibility.
Implementation Method 1
activating carboxy-modified labels with weakly-coordinating anions to react with amino-modified nucleic acids, allowing for efficient labeling with fluorescent dyes
Data Source
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AI summary
The present invention relates to compositions and methods (reagents and protocols) for the post-synthetic modification of nucleic acids obtained from solid-phase oligonucleotide synthesis with a label (such as fluorescent dyes). The coupling reagent is the triazine-based salt 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium (DMT-MM) in the presence of a counteranion.