Aptamer Switch Screening via Fluorescence Resonance Energy Transfer
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Solution Overview
Problem
Current methods for generating novel aptamer switches are hindered by the challenge of creating binding-induced conformational changes, as most aptamers assume a stably folded structure and require post-selection engineering approaches that rely on rational design and detailed structural characterization.
Innovation Solution
A high-throughput screening method is employed to identify molecular switches by providing a library of potential molecular switches with random sequences, each labeled with detectable signals that change proximity upon target binding, allowing for the identification of switches that undergo conformational changes in the presence of a target molecule.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If post-selection engineering approaches are used to create aptamer switches, then functional molecular switches can be generated, but the process requires prior knowledge of aptamer structure and detailed structural characterization
Solution Approach 1:
The patent performs structural characterization and validation of aptamer switches before final implementation. This includes predicting secondary structures, evaluating thermodynamic stability, and assessing conformational changes upon target binding. By completing these actions in advance, the method ensures functional reliability while systematically managing design complexity through structured preliminary analysis.
2Manufacturing precision
If rational design approaches are used for aptamer switches, then structurally optimized switches can be created, but the process is time-consuming and requires multiple trial-and-error iterations
Solution Approach 1:
The patent replaces traditional trial-and-error experimental iteration with in silico computational modeling and prediction. By using bioinformatics tools to predict secondary structures, evaluate thermodynamic parameters, and simulate target binding behavior, the method achieves structural optimization without requiring multiple physical synthesis and testing cycles, thereby dramatically improving productivity while maintaining manufacturing precision.
3Ease of manufacture
If in silico predictions are used for aptamer structure, then initial design can be performed without experimental data, but the predictions often fail to account for non-canonical base-pairing motifs and three-dimensional folding
Solution Approach 1:
The patent introduces an intermediary validation step between in silico prediction and final implementation. This includes using multiple prediction algorithms to cross-validate results, incorporating known structural motifs and non-canonical base-pairing patterns into the modeling framework, and performing targeted experimental verification of predicted structures. This intermediary process bridges the gap between computational convenience and structural accuracy.
4Reliability
If capture-SELEX methods are used for screening aptamer switches, then structure-switching aptamers can be directly selected, but considerable effort and time are required to perform the selection
Solution Approach 1:
The patent performs preliminary in silico filtering and prediction on the aptamer library before conducting capture-SELEX screening. By pre-evaluating sequences for potential structural switching capability, predicted stability, and target binding propensity, the method enriches the library for high-probability candidates. This preliminary action reduces the size and complexity of the subsequent experimental screening, maintaining selection accuracy while significantly reducing the time and effort required.
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 method enables the rapid and efficient identification of molecular switches without requiring prior knowledge of aptamer structure, overcoming the limitations of traditional design approaches and facilitating the generation of functional aptamer-based switches for various applications.
Implementation Method 1
the first label and the second label generate a detectable signal that changes depending on the proximity of the labels to each other
Implementation Method 2
aptamers that undergo a reversible structure-switching mechanism, which is then coupled to either an optical or electrochemical readout
Data Source
AI summary
Methods and compositions for identifying molecular switches are provided.