Chemical Phosphorylation Reagents for Stable Oligonucleotide Purification
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Solution Overview
Problem
Current chemical phosphorylation reagents for oligonucleotides face challenges such as compatibility issues with purification methods, degradation under harsh conditions, and inefficiencies in obtaining high purity 5′-phosphorylated RNA oligonucleotides, particularly due to the loss of protective groups and harsh deprotection conditions.
Innovation Solution
Development of new chemical phosphorylation reagents and methods that allow for stable 5′-phosphorylation and efficient purification of oligonucleotides using oligonucleotide purification cartridges (OPC), enabling retention of the 5′-phosphate group under mild conditions and high-purity isolation of 5′-phosphorylated RNA oligonucleotides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional chemical phosphorylation reagents are used, then 5′-phosphorylation can be achieved, but the reagents are incompatible with standard purification methods and cause degradation under harsh deprotection conditions
Solution Approach 1:
The patent modifies the chemical structure of phosphorylation reagents by changing parameters such as introducing orthogonal protecting groups (e.g., DMT, MMTr, TMT) and adjusting the chemical moieties (e.g., phosphoramidite, phosphotriester, H-phosphonate) to achieve compatibility with mild deprotection conditions while maintaining phosphate group stability
Solution Approach 2:
The patent employs protective groups as intermediary elements that temporarily stabilize the phosphate group during synthesis and purification, allowing the use of mild conditions throughout the process, and are removed only at the final stage to yield the desired 5′-phosphorylated oligonucleotide
2Manufacturing precision
If harsh deprotection conditions are used to remove protective groups, then purification can be achieved, but the 5′-phosphate group decomposes
Solution Approach 1:
The patent changes the deprotection parameters by using mild conditions (e.g., ammonium hydroxide at room temperature or 4 hours at 55-65°C, or AMA at 65°C for 10 minutes) instead of harsh conditions, which prevents phosphate group decomposition while still achieving effective removal of protecting groups
Solution Approach 2:
The patent applies beforehand cushioning by selecting protecting groups that can be removed under mild conditions, preventing the need for harsh deprotection that would damage the phosphate group. The protecting groups are designed to be removed at the optimal time without exposing the phosphate group to damaging conditions
3Reliability
If conventional reagents are used, then phosphorylation can be achieved, but the process requires time-consuming purification and complex chromatography
Solution Approach 1:
The patent extracts the problematic element by removing the need for complex chromatography purification steps. By using reagents with orthogonal protecting groups that are compatible with OPC purification, the process eliminates time-consuming reverse phase HPLC or anion exchange chromatography, achieving high purity through simpler OPC-based methods
4Reliability
If existing phosphorylation reagents are used, then 5′-phosphorylation can be achieved, but the protective groups are lost during purification
Solution Approach 1:
The patent applies preliminary action by selecting and attaching orthogonal protecting groups (DMT, MMTr, TMT) that are designed to remain stable throughout the synthesis and purification process, and are only removed at the final stage. This ensures the protective groups are retained when needed and lost only when intended, preventing premature loss during purification
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 new reagents facilitate simpler and more efficient OPC purification processes, achieving high purity and stability of 5′-phosphorylated oligonucleotides, reducing the time and complexity associated with reverse phase HPLC or anion exchange chromatography.
Implementation Method 1
chemical phosphorylation reagents for the preparation of 5′-phosphorylated oligonucleotides
Implementation Method 2
efficient purification of oligonucleotides using oligonucleotide purification cartridges (OPC)
Data Source
AI summary
Described herein are chemical phosphorylating reagents, their synthesis, and uses thereof.