DNA-Based Linker for Single-Molecule Tether Verification
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Solution Overview
Problem
Current single-molecule experimentation techniques face challenges in reliably linking molecules to surfaces and distinguishing between specific and non-specific interactions, leading to difficulties in verifying the presence of a single molecular tether and accurately measuring mechanical properties.
Innovation Solution
A nano-engineered DNA-based linker that behaves as a force-activated switch, integrating binding pairs like receptors and ligands into a DNA backbone, allowing for reliable identification of a single tether through force-extension behavior and easy monitoring of binding interactions using standard gel electrophoresis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional single-molecule tethering methods are used to link molecules to surfaces, then molecular manipulation and detection become possible, but it becomes difficult to verify the presence of a single molecular tether and distinguish it from non-specific interactions
Solution Approach 1:
The patent introduces a DNA-based linker as an intermediary component between the molecular tether and the surface. This linker contains integrated binding pairs (receptor-ligand) that provide a molecular signature, serving as a mediator that enables verification of single-molecule tethering while reducing non-specific interactions. The linker acts as a controllable interface that can be switched between bound and unbound states.
Solution Approach 2:
The patent employs detectable signals (analogous to color changes) to indicate the bound versus unbound states of the linker. These molecular signatures provide visual or detectable confirmation of single-molecule tethering, allowing researchers to distinguish specific interactions from non-specific ones through observable changes in the system's state.
2Productivity
If multiple binding sites are used on surfaces to enable molecular interactions, then more interactions can be detected, but it becomes harder to distinguish specific interactions from non-specific and multiple bond formations
Solution Approach 1:
The patent segments the interaction system into distinct functional components: the DNA linker, the binding pairs, and the surface attachment sites. Each component has a specific function, and the modular design allows for controlled interactions. The linker contains specific binding pairs that are spatially separated and functionally distinct, enabling precise identification of specific interactions even when multiple sites are present on the surface.
3Ease of operation
If conventional linking techniques are used to tether molecules, then surface attachment is achieved, but the dissociation between molecules is difficult to positively identify due to lack of obvious mechanical signature
Solution Approach 1:
The patent introduces dynamic switching capability into the linker system, where the binding pairs can transition between bound and unbound states in response to applied force. This dynamic behavior creates a mechanical signature that is easily detectable. The linker acts as a molecular switch that changes its conformation or binding state, providing a clear signal of dissociation events that can be monitored in real-time.
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 enhances the reliability and accuracy of force measurements, enables high-throughput serial measurements, and facilitates the identification of binding partners and kinetic studies, while eliminating errant data from non-specific interactions.
Implementation Method 1
a first single-stranded oligonucleotide in the plurality is linked to a first binding partner
Implementation Method 2
easy monitoring of binding interactions using standard gel electrophoresis
Data Source
AI summary
The invention provides compositions comprising nucleic acid complexes for use in monitoring binding interactions and in measuring association and/or dissociation kinetics with or without force, detecting analytes, screening aptamers, and encoding/encrypting information. In some instances, the nucleic acid complexes are double-stranded nicked nucleic acids comprising a scaffold nucleic acid hybridized to one or more oligonucleotides. In some instances, a first and/or a second oligonucleotide are linked to moieties that are known to interact with each other or which are suspected of interacting with each other.