Mutant CAT Enzyme Fluorescence Detection of Chloramphenicol
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Solution Overview
Problem
Current methods for detecting chloramphenicol contamination in food products are not rapid or sensitive enough, posing a risk due to the antibiotic's banned use in food production, necessitating a more effective detection method.
Innovation Solution
A method utilizing a mutant chloramphenicol acetyltransferase enzyme and fluorophore-linked chloramphenicol, where the fluorescence is suppressed upon binding and restored upon the presence of unmodified chloramphenicol, allowing for qualitative and quantitative measurement of chloramphenicol concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection methods are used for chloramphenicol, then the detection can be performed with standard equipment, but the detection speed and sensitivity are insufficient
Solution Approach 1:
The patent replaces conventional mechanical/chemical detection methods with a fluorescence-based optical detection system. The mutant CAT enzyme binds fluorophore-linked chloramphenicol, producing a fluorescence signal that can be detected with high sensitivity and speed using standard fluorometry equipment, thereby improving both detection sensitivity and speed simultaneously.
Solution Approach 2:
The patent modifies the CAT enzyme by introducing specific mutations (e.g., V28W, L197P) that alter its binding properties to fluorophore-linked substrates. These parameter changes in the enzyme's structure enable enhanced fluorescence signal generation upon substrate binding, achieving both high sensitivity and rapid detection capability.
2Measurement precision
If a mutant enzyme with enhanced fluorescence binding is used, then detection sensitivity improves, but the device complexity increases due to enzyme engineering
Solution Approach 1:
The patent introduces specific point mutations at localized positions in the CAT enzyme structure (e.g., position 28, position 197) that specifically enhance fluorescence binding without requiring global restructuring of the enzyme. This localized modification approach achieves enhanced sensitivity while minimizing the complexity of enzyme engineering.
3Measurement precision
If fluorophore-linked chloramphenicol is used as substrate, then fluorescence signal is generated for detection, but the cost of reagents increases
Solution Approach 1:
The patent employs fluorophore-linked chloramphenicol as a disposable substrate that is consumed during the detection reaction. The substrate is designed to be used in small quantities for rapid detection, where the cost of the consumable reagent is offset by the speed and sensitivity advantages, eliminating the need for expensive expensive instrumentation or repeated measurements.
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 provides a rapid and sensitive detection of chloramphenicol, enabling both qualitative and quantitative analysis, effectively addressing the need for quick and reliable contamination detection in food samples.
Implementation Method 1
the fluorescence of the fluorophore-linked chloramphenicol is specifically suppressed
Implementation Method 2
the fluorescence of the fluorophore-linked chloramphenicol can be strongly suppressed by a modified chloramphenicol acetyltransferase
Implementation Method 3
it competes with fluorophore-linked chloramphenicol 2 for the active site on enzyme 1 and, when present in a sufficient amount, chloramphenicol 4 will dislodge fluorophore-linked chloramphenicol 2 from the active site
Implementation Method 4
can be restored by addition of unmodified chloramphenicol
Data Source
AI summary
Fast and simple method of detecting the presence of chloramphenicol, a harmful compound if present in food products. The method makes use of a mutant chloramphenicol acetyltransferase (CAT) and a fluorophore-linked chloramphenicol in a system where chloramphenicol and the fluorophore-linked chloramphenicol competes for the active site of the mutant CAT. Because the fluorophore-linked chloramphenicol reduces its fluorescence upon binding to the active site and vice versa increases its fluorescence upon being displaced from the active site by the presence of unmodified chloramphenicol in a sample, the increase of fluorescence caused by a testing sample indicates the presence of chloramphenicol.