SARS-CoV-2 Detection via 3CL Protease Cleavage
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Solution Overview
Problem
Current methods for detecting SARS-CoV-2, such as PCR and immunoassays, face challenges with false negatives and positives, inability to distinguish active from inactive viruses, and require manual intervention, making them inefficient and unreliable for rapid and accurate diagnosis.
Innovation Solution
A method involving a composition that detects the 3CL protease of SARS-CoV-2 using a substrate peptide with a detectable moiety, such as a FRET pair, which generates a signal upon cleavage, allowing for the detection of active virus presence in samples like saliva or nasopharyngeal swabs using a portable fluorescence spectrophotometer or lateral flow device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If PCR tests are used for SARS-CoV-2 detection, then detection sensitivity is improved, but false positive results occur and inability to distinguish active from inactive viruses
Solution Approach 1:
The invention extracts and detects only the active 3CL protease enzyme from the virus, rather than detecting all viral genetic material including inactive forms. This selective extraction of the functional enzyme component resolves the contradiction by specifically targeting active viruses while ignoring inactive genetic material that causes false positives in PCR tests.
Solution Approach 2:
The invention introduces a substrate peptide as an intermediary that specifically interacts with the active 3CL protease enzyme. This intermediary enables selective detection of enzymatically active viruses through a colorimetric or fluorescent signal, distinguishing active from inactive viruses and eliminating false positives while maintaining high sensitivity.
2Measurement precision
If manual intervention is required for testing, then detection accuracy is maintained, but productivity decreases and disease spread increases
Solution Approach 1:
The invention creates a self-service detection system where the substrate peptide automatically reacts with the 3CL protease enzyme to produce a visible colorimetric or fluorescent signal without requiring manual intervention. This autonomous detection mechanism maintains accuracy while enabling high-throughput testing and point-of-care use, dramatically increasing productivity and reducing human exposure risk.
Solution Approach 2:
The invention replaces manual mechanical testing procedures with an automated biochemical reaction system. The substrate peptide-enzyme interaction automatically generates detectable signals, substituting human-operated mechanical processes with self-executing chemical-biological mechanisms that maintain accuracy while scaling throughput.
3Productivity
If rapid tests are developed for speed, then productivity increases, but measurement precision decreases due to false negatives and positives
Solution Approach 1:
The invention changes the detection parameter from genetic material amplification (PCR) or antibody binding (immunoassay) to direct enzymatic activity detection. By measuring the functional output of the 3CL protease enzyme through substrate cleavage, the test achieves both rapid results and high precision, eliminating false negatives and positives while maintaining speed.
Solution Approach 2:
The invention substitutes complex mechanical amplification processes with a direct enzymatic reaction that produces immediate detectable signals. This replacement eliminates multi-step amplification procedures that are time-consuming and error-prone, achieving both rapid testing and high measurement precision through a streamlined biochemical mechanism.
4Measurement precision
If complex assays are used for accuracy, then measurement precision is improved, but device complexity increases and automation becomes difficult
Solution Approach 1:
The invention extracts the essential diagnostic function to a single enzymatic reaction between the substrate peptide and 3CL protease, eliminating complex multi-step assay procedures. This simplified extraction maintains detection accuracy by directly measuring viral enzyme activity while reducing device complexity to enable easy automation and point-of-care deployment.
Solution Approach 2:
The substrate peptide serves multiple functions simultaneously: it acts as an enzyme substrate, a signal generator, and a specific marker for active 3CL protease. This multi-functionality consolidates what would otherwise require multiple separate reagents and steps, maintaining measurement precision while dramatically simplifying the overall assay design and enabling automation.
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 approach enables rapid, accurate, and sensitive detection of SARS-CoV-2, distinguishing active from inactive viruses, and can be automated, reducing the spread of the disease by providing quick diagnostic results at the point of care.
Implementation Method 1
a substrate peptide with a detectable moiety, such as a FRET pair, which generates a signal upon cleavage
Data Source
AI summary
The present invention is directed towards methods, compositions and kits for testing SARS-CO-V2 virus in a sample. The methods determine the presence of a viral 3CL protease by contacting the sample with a peptide compound capable of being cleaved by the protease to form peptide compound fragments. Detection of a peptide compound fragment confirms the presence of the virus.