Linker-FRET Oligonucleotides for Weak Molecular Interaction Screening
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Solution Overview
Problem
Current high-throughput screening technologies for molecular interactions, particularly protein-protein interactions, face limitations in detecting weak interactions and are often costly, such as requiring high concentrations of proteins or using expensive bead-based assays.
Innovation Solution
The development of linker-FRET and polymer-FRET methodologies, including nanoswitch-FRET, which allow for the detection of molecular interactions using lower concentrations of proteins by employing short FRET oligonucleotides and linkers to enhance binding affinity and stability, enabling the analysis of weak interactions at lower costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high concentrations of target protein are used in fluorescence polarization or TR-FRET assays, then the interaction detection capability is improved, but the cost increases significantly
Solution Approach 1:
The patent introduces oligonucleotide linkers as intermediary molecules that bridge the target protein and the FRET fluorophores. These linkers enable the assay to function at lower protein concentrations by providing an additional binding interface, thus resolving the contradiction between detection capability and protein cost
Solution Approach 2:
The invention creates a composite detection system combining protein targets, oligonucleotide linkers, and FRET fluorophores. This composite approach allows the assay to achieve high measurement precision while reducing the required concentration of the expensive target protein
2Measurement precision
If bead-based assays such as Alphascreen are used for molecular interaction screening, then the interaction detection capability is improved, but the cost increases due to expensive beads and high target concentration requirements
Solution Approach 1:
The patent replaces expensive, reusable bead-based systems with inexpensive, soluble oligonucleotide linkers that can be used in disposable microplate formats. This substitution dramatically reduces the cost per assay while maintaining interaction detection capability
Solution Approach 2:
The oligonucleotide linkers serve as intermediary molecules that eliminate the need for expensive beads while providing the necessary platform for FRET signal generation, thus resolving the cost contradiction
3Ease of manufacture
If conventional FRET assays are used to detect weak molecular interactions, then the assay can be performed with simple equipment, but the target protein concentration must be high which increases cost
Solution Approach 1:
The patent changes the binding parameters by introducing oligonucleotide linkers with specific sequences and lengths that optimize binding affinity. This allows the assay to detect weak interactions at lower protein concentrations while maintaining simplicity
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
These methodologies enable cost-effective high-throughput screening of molecular interactions by allowing the detection of binding interactions at concentrations significantly below the dissociation constant, improving the analysis of weak interactions and reducing the need for high protein concentrations.
Implementation Method 1
the first oligonucleotide is conjugated to a FRET donor fluorophore, and a second oligonucleotide, conjugated to a FRET acceptor fluorophore
Data Source
AI summary
This disclosure provides new and improved systems and methods for analyzing binding interactions and for identifying and measuring agents that modulate such binding interactions, including weak binding interactions. The methods may be used in high throughput screening assays.