Microbial Biosensor Using Transcription Factor Conformational Changes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current hormone biosensors lack sensitivity, selectivity, and diversity, particularly for detecting small molecules like hormones, and rely on costly and challenging antibody and aptamer-based approaches, which do not effectively utilize inherent transduction mechanisms for signal output.
Innovation Solution
A microbial-based biosensor system utilizing analyte-responsive transcription factors (aTFs) with Förster resonance energy transfer (FRET) or redox sensor outputs, where aTFs are conjugated to quantum dots or electroactive molecules, modulating their affinity for DNA binding sequences in response to target analytes, enabling sensitive and specific detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antibody or aptamer-based approaches are used for label-free sensing, then molecular specificity is achieved, but the cost and technical complexity increase significantly
Solution Approach 1:
The patent uses transcription factors that can be easily produced and regenerated, replacing expensive antibodies and aptamers. The transcription factor system provides a cost-effective, disposable sensing mechanism that eliminates the need for complex SELEX processes and expensive antibody production while maintaining detection capability.
Solution Approach 2:
The transcription factor inherently provides both recognition and transduction functions through its natural biological mechanism. When the transcription factor binds to its target analyte, it automatically undergoes a conformational change that modulates its DNA-binding affinity, generating a measurable signal without requiring external labeling or complex transduction systems.
2Measurement precision
If antibodies or aptamers are used as recognition elements, then specific binding is achieved, but no inherent transduction mechanism is provided
Solution Approach 1:
The transcription factor serves multiple functions simultaneously: it acts as the recognition element that binds to the target analyte with high specificity, and it also serves as the transduction element that converts this binding event into a measurable signal through its conformational change and modulated DNA-binding affinity. This multi-functionality eliminates the need for separate recognition and transduction components.
Solution Approach 2:
The transcription factor's natural allosteric mechanism provides self-contained transduction. Upon analyte binding, the transcription factor automatically changes conformation and modulates its affinity for its cognate DNA binding sequence, generating a signal that reflects the analyte concentration without requiring external labeling or complex transduction machinery.
3Reliability
If traditional hormone biosensors are used, then detection capability is provided, but sensitivity and selectivity are insufficient
Solution Approach 1:
The patent exploits the parameter change in transcription factor DNA-binding affinity that occurs upon analyte binding. As the transcription factor binds to its target analyte, its conformational change causes a measurable change in its affinity for the DNA binding sequence. This parameter change provides a sensitive and selective readout that directly reflects the analyte concentration with high quantification 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
The system provides high-sensitivity and selective quantification of target analytes, including hormones, through conformational changes that facilitate gene expression regulation, offering a more efficient and cost-effective alternative to traditional methods.
Implementation Method 1
In the presence of a target small molecule, TF affinity for its DNA binding sequence is modulated, facilitating the repressor or derepressor regulation of downstream gene expression
Implementation Method 2
analyte-responsive transcription factor-DNA binding mechanism with either a fluorescent output through Förster resonance energy transfer (FRET)
Implementation Method 3
analyte-responsive transcription factor-DNA binding mechanism with either a fluorescent output through Förster resonance energy transfer (FRET) or a redox sensor output
Data Source
AI summary
Described herein are methods, compositions and processes related to a microbial-based biosensor system for the detection of small molecules and analytes based on an analyte-responsive transcription factor-DNA binding mechanism with either a ratiometric fluorescent output through Förster resonance energy transfer (FRET) or a redox sensor output for the quantification of the target analyte with high sensitivity.