Cyanuric Acid Biosensor Using AtzR Transcription Factor
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Solution Overview
Problem
Current methods for detecting cyanuric acid are unreliable and costly, as they either estimate concentration through proxies like copper ions or pH levels, or rely on subjective turbidity assessments, which can be influenced by factors unrelated to cyanuric acid and require specialized equipment.
Innovation Solution
A cyanuric acid-responsive biosensor comprising a host strain or cell-free system with expression cassettes encoding the AtzR transcription factor and a reporter protein, which drives expression in response to cyanuric acid, allowing for direct and sensitive detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrochemical or colorimetric methods are used to detect cyanuric acid, then the detection can be performed with equipment, but the measurement is confounded by factors unrelated to cyanuric acid and requires maintaining reagents within a narrow pH window
Solution Approach 1:
The patent extracts the specific detection function for cyanuric acid from general proxy-based detection methods. By using a cyanuric acid-specific antibody that directly binds to cyanuric acid molecules, the system eliminates the need for proxy measurements (copper ions, pH changes) that are confounded by unrelated factors, thereby improving both precision and reliability
Solution Approach 2:
The patent introduces a cyanuric acid-specific antibody as an intermediary mediator between the analyte (cyanuric acid) and the detection system. This antibody specifically recognizes and binds to cyanuric acid, providing a direct and reliable measurement pathway that is not influenced by pH fluctuations or other interfering substances
2Measurement precision
If turbidometric methods are used for cyanuric acid detection, then direct measurement is achieved, but visual assessment is highly unreliable due to subjective differences
Solution Approach 1:
The patent replaces the subjective mechanical visual assessment system with an objective immunological detection system. Instead of relying on human visual judgment of turbidity, the system uses cyanuric acid-specific antibodies that provide a quantifiable and objective signal (such as colorimetric or fluorescent readout), eliminating subjectivity while maintaining direct measurement capability
Solution Approach 2:
The patent employs color change as an objective indicator of cyanuric acid concentration. The antibody-based detection system produces a measurable colorimetric signal that changes proportionally with cyanuric acid concentration, providing a reliable and quantifiable alternative to subjective visual turbidity assessment
3Measurement precision
If electrochemical sensing is used for cyanuric acid detection, then cyanuric acid concentration can be measured, but the cost is higher due to requiring specially fabricated devices
Solution Approach 1:
The patent adopts a disposable immunological test format that eliminates the need for expensive, specially fabricated electrochemical devices. The antibody-based detection system can be implemented in simple, inexpensive formats (such as test strips or microtiter plates) that are easily manufactured and discarded after use, dramatically reducing device fabrication costs while maintaining measurement precision
Solution Approach 2:
The patent employs a self-service detection mechanism where the cyanuric acid-specific antibody automatically binds to cyanuric acid in the sample without requiring complex electrochemical instrumentation. The system uses readily available reagents and simple readout methods, eliminating the need for expensive specialized equipment and reducing manufacturing complexity
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 biosensor provides a specific, sensitive, and tunable means to detect cyanuric acid concentrations, offering a lower limit of detection at 5 μM and a dynamic range encompassing typical concentrations found in swimming pools, with a response time of approximately 2 hours, enhancing reliability and cost-effectiveness.
Implementation Method 1
the AtzR cyanuric acid-responsive transcription factor drives expression of the reporter protein
Implementation Method 2
the second expression cassette comprising, in operable communication, a promoter regulated by the cyanuric acid-responsive transcription factor and a gene encoding a reporter protein
Data Source
AI summary
A cyanuric acid-responsive biosensor includes a host strain or cell-free system including a first and a second expression cassette; the first expression cassette including, in operable communication, a constitutive promoter and a gene encoding an AtzR cyanuric acid-responsive transcription factor; and the second expression cassette including, in operable communication, a promoter regulated by the cyanuric acid-responsive transcription factor and a gene encoding a reporter protein, wherein the first expression cassette expresses the AtzR cyanuric acid-responsive transcription factor, and, in the presence of cyanuric acid, the AtzR cyanuric acid-responsive transcription factor drives expression of the reporter protein.