Amidite Deprotection for Stable Modified Nucleic Acid Synthesis
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Solution Overview
Problem
Current methods for synthesizing modified nucleic acids face challenges in removing protective groups under moderate conditions, leading to instability and loss of affinity-modifying moieties, which hinders the production of stable modified nucleic acids suitable for protein analysis.
Innovation Solution
Development of an amidite with a protective group that can be removed in an aprotic solvent, such as acetonitrile, using a bulky base like DBU, allowing for the emergence of a hydroxyl group without removing the affinity-modifying substituent, enabling stable synthesis of modified nucleic acids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional deprotection conditions (concentrated ammonia water at 55°C for 8-15 hours) are used to remove protective groups from amidites, then the protective groups are successfully removed, but the affinity-modifying substituents in the modified nucleic acid are also removed, leading to instability and loss of function
Solution Approach 1:
The patent changes the deprotection parameters by using a different solvent system (acetonitrile instead of aqueous ammonia) and milder conditions (room temperature for 16-72 hours instead of 55°C for 8-15 hours). This parameter change allows selective removal of protective groups while preserving the affinity-modifying substituents that would be removed under conventional conditions.
Solution Approach 2:
The patent introduces a specific amidite structure with a protective group that can be selectively removed under mild conditions. The amidite acts as an intermediary compound that enables controlled deprotection without affecting the affinity-modifying moiety, thus mediating between the need for protective group removal and the need to preserve functional substituents.
2Adaptability or versatility
If modified nucleic acids are synthesized to show affinity for target proteins, then protein analysis capability is improved, but the synthesis process requires moderate deprotection conditions that are difficult to achieve without losing the affinity-modifying moieties
Solution Approach 1:
The patent modifies the synthesis parameters by developing an amidite with a protective group removable under mild conditions (acetonitrile solvent, room temperature, DBU base). This enables the synthesis of affinity-modified nucleic acids without requiring extreme deprotection conditions, thus maintaining both functionality and manufacturability.
3Productivity
If the protective group is removed under harsh conditions to ensure complete deprotection, then deprotection efficiency is improved, but the affinity-modifying substituent is removed along with the protective group, rendering the modified nucleic acid non-functional
Solution Approach 1:
The patent achieves complete deprotection under mild conditions by changing the solvent to acetonitrile and using DBU as a base at room temperature for extended periods (16-72 hours). This parameter change maintains functional integrity while ensuring thorough removal of protective groups.
Solution Approach 2:
The patent applies excessive deprotection time (16-72 hours) under mild conditions to ensure complete removal of protective groups without using harsh conditions. This excessive action in time rather than intensity achieves full deprotection while preserving the affinity-modifying substituent.
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 amidite allows for the stable production of modified nucleic acids with exposed hydroxyl groups, enabling effective binding to target proteins, thus facilitating protein analysis.
Implementation Method 1
the protective group can be removed in an aprotic solvent, and when the protective group is removed, the hydroxyl group emerges in the substituent
Data Source
AI summary
To provide an excellent amidite for synthesizing modified nucleic acid, which enables a protective group therein to be removed under a moderate condition, thereby stably producing a hydroxyl group-containing modified nucleic acid, and a method for synthesizing modified nucleic acid using the amidite. Specifically, an amidite for synthesizing modified nucleic acid, expressed by General Formula (I):where X represents a base, Y represents a substituent, Z represents a protective group for protecting a hydroxyl group in the substituent, and Q represents one of a hydrogen atom, a hydroxyl group and a hydroxyl group protected by a protective group,wherein the protective group can be removed in an aprotic solvent, and when the protective group is removed, the hydroxyl group emerges in the substituent, and a method for synthesizing modified nucleic acid using the amidite.