Spin-Labeled Nucleosides for Single-Molecule EPR Detection
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Solution Overview
Problem
There is a need for alternative spin-labeled bases, nucleosides, oligonucleotides, and phosphoramidites to enable quantum sensing of binding events, particularly in preserving the transient protection of free radicals during the synthesis of synthetic DNA and RNA to avoid ambiguity in existing fluorescent techniques.
Innovation Solution
The introduction of a spin-labeled group to any site within an oligonucleotide via a modified deoxyuridine phosphoramidite, employing two protection strategies to preserve the masked radical during monomer production and subsequent synthesis, allowing for the unmasking of the radical group using methods compatible with oligonucleotide properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fluorescent techniques are used for detection, then binding events can be detected, but ambiguity associated with non-specific adsorption occurs
Solution Approach 1:
The patent introduces a spin label as an intermediary between the oligonucleotide and the detection system. The spin label contains a nitroxide radical that serves as a specific mediator for EPR detection, allowing the detection system to interact with the oligonucleotide through this intermediate component rather than directly with the oligonucleotide itself, thereby reducing non-specific adsorption interference
2Adaptability or versatility
If a spin-labeled group is introduced to oligonucleotide, then quantum sensing capability is enabled, but the free radical in the spin label is affected by synthesis chemistry
Solution Approach 1:
The patent applies preliminary protective action by introducing a protecting group to the nitroxide radical before oligonucleotide synthesis. This protecting group is applied in advance to prevent the radical from being affected by the synthesis chemistry, and is subsequently removed after synthesis to restore the radical's quantum sensing capability
Solution Approach 2:
The protecting group acts as an intermediary that temporarily replaces the vulnerable radical during synthesis. This intermediary component shields the radical from harmful chemical reactions during the synthesis process, then is removed to restore the original functional group
3Quantity of substance
If existing fluorescent techniques are used, then binding detection is possible, but single-molecule level detection with unambiguous results cannot be achieved
Solution Approach 1:
The patent replaces the optical detection mechanism (fluorescence) with a magnetic resonance detection mechanism (EPR). This substitution changes the fundamental detection physics from optical transitions to electron spin transitions, enabling single-molecule detection with unambiguous results by exploiting the unique magnetic properties of the nitroxide radical
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 precise detection of binding events at a single-molecule level through electron paramagnetic resonance measurements, reducing ambiguity associated with non-specific adsorption in existing methods.
Implementation Method 1
the detection of a binding event at a single-molecule level via an electron paramagnetic resonance measurement (EPR) signature
Data Source
AI summary
Spin-labeled uridine nucleosides and phosphoramidites are provided, including improved methods of synthesis and oligonucleotides comprising the spin-labeled nucleosides.