Modified Nucleotides With PEG Spacer for Ligation Efficiency
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Solution Overview
Problem
Current nucleotide labeling methods face challenges in achieving high ligation efficiency and minimizing reactivity with cell lysates, while also ensuring the labeled nucleotides retain biological activity and can be detected effectively.
Innovation Solution
The development of modified nucleotides with specific structures, such as biotin-polyethylene glycol (PEG)-alkane-3′,5′-cytidine bisphosphate, which incorporate an alkane linkage and a PEG spacer, enhancing ligation efficiency and reducing reactivity with cell lysates, allowing for efficient labeling and detection using enzymes like T4 RNA ligase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional nucleotide labeling methods are used, then labeling can be achieved, but ligation efficiency is low and reactivity with cell lysates is high
Solution Approach 1:
The patent introduces a PEG spacer as an intermediary component between the nucleotide and the label. This PEG linker acts as a mediator that physically separates the label from the nucleotide, reducing steric hindrance during ligation while preventing the label from interfering with enzymatic reactions, thereby resolving the contradiction between improving ligation efficiency and reducing unwanted reactivity
Solution Approach 2:
The patent modifies the chemical structure of nucleotides by changing parameters such as the type of linker (PEG vs. direct attachment), the length of the spacer, and the position of label attachment. These parameter changes optimize the balance between maintaining ligation efficiency and minimizing reactivity with cell lysates, allowing the nucleotide to function properly while reducing harmful side reactions
2Measurement precision
If modified nucleotides with labels are used, then detection capability is improved, but biological activity may be compromised
Solution Approach 1:
The patent segments the nucleotide structure into distinct functional modules: the nucleotide base, the sugar-phosphate backbone, the PEG spacer, and the label. This segmentation allows each component to perform its specific function independently, ensuring that the label provides detection capability while the nucleotide portion maintains its biological activity for incorporation by polymerases
Solution Approach 2:
The PEG spacer serves as an intermediary that connects the nucleotide to the label while maintaining a flexible distance. This intermediary structure allows the label to extend away from the nucleotide, providing detection capability without sterically hindering the nucleotide's interaction with enzymatic systems, thus preserving biological activity
3Ease of operation
If labels are attached directly to nucleotides, then detection is simplified, but steric hindrance reduces ligation efficiency
Solution Approach 1:
The patent extends the label-nucleotide connection into the third dimension by using a flexible PEG spacer that projects the label away from the plane of the nucleotide. This dimensional extension reduces steric hindrance during ligation reactions while maintaining the label's position for effective detection, resolving the contradiction between detection simplicity and ligation efficiency
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 modified nucleotides demonstrate improved ligation efficiency and functionality, with ligation efficiencies greater than 70% and minimal reactivity with cell lysates, enabling effective labeling and detection of RNA probes for applications like mobility shift assays and Northern blots.
Implementation Method 1
X is a cleavable group that can undergo silicon-carbon cleavage, nucleophilic cleavage, redox cleavage, photochemical cleavage, enzymatic cleavage, or exchange-based cleavage
Data Source
AI summary
Modified nucleotides, and methods to modify nucleotides with a moiety or label, such as biotin, that permits their detection and results in a modified nucleotide, and methods of use of the modified nucleotide in quantitative and qualitative assays.