RNA-Peptide Complex Formation via 2'-Modified Splint DNA
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Solution Overview
Problem
The existing mRNA display methods face inefficiencies in linking RNA molecules with peptide receptor molecules, particularly due to the lack of control over base sequences and the need for purification steps that reduce ligation efficiency and increase the complexity of obtaining RNA-peptide complexes.
Innovation Solution
A method involving the use of a splint DNA with 2'-modified nucleosides to facilitate the binding of peptide receptor molecules to RNA molecules, allowing for efficient translation and complex formation without prior purification, utilizing an in vitro translation system with minimal RNA polymerase activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mRNA display methods are used without 2'-modified nucleosides, then the base sequence control is poor and base addition errors occur, but the ligation efficiency is reduced and purification steps are required
Solution Approach 1:
The patent applies parameter changes by incorporating 2'-modified nucleosides (such as 2'-O-methyl nucleosides) at specific positions in the DNA template, particularly at the 5' end of the antisense strand. This chemical modification changes the transcription parameters to prevent non-templated base addition by RNA polymerase, thereby improving base sequence control and ligation efficiency simultaneously without requiring purification steps.
2Reliability
If purification steps are included in the workflow, then base addition errors are reduced, but the complexity increases and yield decreases
Solution Approach 1:
The patent implements preliminary action by preventing base addition errors at the source through the use of 2'-modified nucleosides in the DNA template during the transcription step. This proactive approach eliminates the need for subsequent purification steps to remove incorrectly added bases, thereby simplifying the workflow while maintaining reliability.
3Productivity
If RNA polymerase activity is high in the translation system, then translation efficiency is improved, but non-templated base addition occurs reducing ligation accuracy
Solution Approach 1:
The patent uses 2'-modified nucleosides as an intermediary mechanism that mediates between the high RNA polymerase activity needed for efficient translation and the need for base sequence accuracy. These modified nucleosides act as a protective element that allows robust transcription while preventing non-templated base addition, thus resolving the contradiction between translation efficiency and sequence accuracy.
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 significantly enhances the efficiency of obtaining RNA-peptide complexes by reducing base addition errors and eliminating the need for purification steps, thereby improving the overall yield and stability of the complexes.
Implementation Method 1
binding, to a 3' end of the RNA molecule obtained in the step (i), a peptide receptor molecule with use of a splint polynucleotide as an anchorage
Implementation Method 2
performing, in an in vitro translation system containing substantially no RNA polymerase having an activity on the DNA molecule, translation of the RNA molecule
Data Source
Figure 1(A)~1(B)
Figure 2(A)~2(C)
Figure 3(A)~3(B)
AI summary
The present invention provides a method for efficiently obtaining a complex in which a gene (mRNA) and a peptide as a translation product thereof are linked via a peptide receptor molecule, and utilization thereof. In the method of the present invention, at least one 2'-modified nucleoside derivative is introduced into a 5' end side of an antisense strand of a template DNA.