Covalent RNA Tethering for Flow Cell Stability
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Solution Overview
Problem
Current methods for displaying RNA and polypeptides on flow cells are limited by non-covalent linkage, instability under various conditions, and inefficient translation, leading to suboptimal yield and analysis limitations.
Innovation Solution
A method involving substrate-bound libraries of XNA, RNA, and polypeptides is developed, where a first nucleic acid is immobilized with a 5' end proximal and 3' end distal to the substrate, allowing for the generation of complementary nucleic acids through nucleic acid polymerization, followed by cleavage and linearization to enhance polymerization efficiency and translation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If non-covalent tethering of RNA to DNA clusters is used, then the method is simpler to implement, but the complexes decompose over time and require loss-of-signal normalization
Solution Approach 1:
The patent incorporates a covalent linker moiety into the RNA molecule during synthesis, before the RNA is tethered to the flow cell. This preliminary incorporation of the covalent linkage mechanism ensures stable attachment throughout subsequent processing and analysis steps, eliminating the decomposition issues associated with non-covalent tethering.
Solution Approach 2:
The patent introduces a covalent linker moiety as an intermediary between the RNA molecule and the flow cell surface. This linker acts as a stable bridge that maintains the RNA in a tethered state without requiring complex DNA-RNA polymerase complexes, thus improving reliability while maintaining ease of implementation.
2Measurement precision
If conditions are applied to denature complexes for analysis, then structural information can be obtained, but the complexes disassociate
Solution Approach 1:
The patent extracts the RNA molecule from the unstable DNA-RNA-polymerase complex by using a covalent tether to the flow cell. This allows the RNA to be analyzed independently under denaturing conditions without requiring the maintenance of the complex structure, thus obtaining structural information while avoiding disassociation issues.
3Ease of operation
If low concentration of magnesium is used, then ribosomes can function, but ribosomes disassociate from complexes
Solution Approach 1:
The covalent linker moiety serves as a stable intermediary that anchors the RNA to the flow cell, allowing ribosomes to bind and function without requiring high magnesium concentrations. The stable tether provides the necessary structural support that compensates for lower magnesium levels, maintaining both ribosome function and complex stability.
4Productivity
If high concentration of magnesium is used, then polymerase activity is enhanced, but RNA polymerase disassociates from complexes
Solution Approach 1:
The patent extracts the RNA synthesis function from the unstable polymerase complex by using a covalently tethered RNA template. The RNA is permanently attached to the flow cell, allowing polymerase activity to occur during the synthesis phase without requiring stable maintenance of the complex during subsequent analysis, thus achieving high productivity without compromising stability.
5Quantity of substance
If yield of RNA is increased, then more polypeptides can be produced, but current methods have suboptimal yield
Solution Approach 1:
The patent incorporates a covalent linker moiety into the RNA molecule during synthesis, creating a stable product that can be efficiently translated. This preliminary covalent attachment prevents RNA degradation and loss during processing, thereby increasing the effective yield of RNA available for polypeptide production without requiring optimization of translation conditions.
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
Enables high-throughput drug discovery with unprecedented high-resolution data generation, allowing for efficient screening and engineering of therapeutic drugs through improved stability and yield of biomolecules.
Implementation Method 1
contacting the first nucleic acid with a nucleic acid polymerase under conditions suitable for polymerisation, wherein the primer for polymerisation is a DNA primer immobilised on the substrate such a bridge is formed during polymerisation
Implementation Method 2
Some methods make use of DNA clusters immobilised to a flow cell to produce RNA that is non-covalently tethered to the DNA clusters via a stalled RNA polymerase
Data Source
AI summary
The invention relates to methods of displaying biomolecules on substrates, for instance on the surface of flow cells. The invention relates to upstream, downstream, or direct methods for displaying XNA molecules, RNA molecules, and/or polypeptides on the substrate. The invention further relates to substrates displaying biomolecules that are obtained or obtainable by the methods of the invention.