Split Enzyme Viral Detection via Disulfide Bond Reconstitution
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Solution Overview
Problem
Current methods for detecting viral and bacterial analytes are labor-intensive, costly, and time-consuming, often requiring specialized equipment and expertise, limiting their accessibility and accuracy for rapid and inexpensive detection, especially in point-of-care settings.
Innovation Solution
A composition and method using split enzyme constructs with sulfhydryl groups that form disulfide bonds upon antigen binding, allowing for reconstitution of the enzyme only when bound to the analyte, enabling signal amplification without additional enzymes or reagents, and can be adapted for various analytes by modifying the antigen-recognizing amino acid sequences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If split enzyme systems are designed to favor enzyme formation to ensure sensitivity, then detection sensitivity is improved, but non-specific reconstitution occurs in the absence of analyte resulting in high false positives
Solution Approach 1:
A disulfide bond serving as an intermediary mechanism is introduced between the two enzyme portions. This chemical bond acts as a mediator that forms specifically when both antibody portions are bound to the analyte, providing an additional layer of specificity beyond simple proximity. The disulfide bond ensures that enzyme reconstitution only occurs under the correct conditions (analyte presence), thereby reducing false positives while maintaining sensitivity.
2Measurement precision
If current viral detection methods use genome extraction and conversion procedures, then detection accuracy is improved, but time consumption and complexity increase
Solution Approach 1:
The invention extracts and detects only the essential antigenic component of the virus rather than requiring complete genome extraction and processing. By targeting specific viral antigens directly with antibody-based split enzyme constructs, the method eliminates time-consuming steps such as RNA extraction, reverse transcription, and DNA amplification, while maintaining diagnostic accuracy through specific antigen-antibody recognition.
Solution Approach 2:
The invention replaces complex mechanical and chemical processing systems (genome extraction equipment, PCR machines, multiple enzymatic reactions) with a simplified immunological detection system. The split enzyme reconstitution mechanism substitutes for elaborate nucleic acid processing workflows, enabling accurate viral detection through antibody-antigen binding and enzymatic signal generation without requiring sophisticated laboratory infrastructure.
3Reliability
If antigenic tests use multiple antibodies and incubation steps, then detection reliability is improved, but labor intensity and cost increase
Solution Approach 1:
The invention merges the functions of capture antibody, detection antibody, and signal generation into a single integrated system. The two antibody portions and two enzyme portions are combined in one reaction mixture, allowing simultaneous binding and signal production without sequential incubation steps. This consolidation maintains reliable detection through specific antibody-antigen interactions while dramatically reducing procedural complexity and labor requirements.
Solution Approach 2:
The split enzyme constructs serve multiple functions simultaneously: the antibody portions provide specific antigen recognition and capture, while the enzyme portions provide signal amplification and detection. This multi-functionality eliminates the need for separate reagents and steps for each function, reducing both labor intensity and cost while maintaining reliable detection through the coordinated action of all components.
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 provides a rapid, sensitive, and specific detection method that can be administered at the point of care, reducing costs and complexity, while minimizing false positives and negatives, and is adaptable for different diseases and analytes.
Implementation Method 1
The first and second synthetic constructs comprise a sulfhydryl group configured such that a disulfide bond is formed between the first and second synthetic constructs when the first antigen-recognizing amino acid sequence and the second antigen-recognizing amino acid sequence bind an antigen
Implementation Method 2
a second portion of the protein that catalyzes a reaction or is otherwise detectable when combined with the first portion of the protein
Data Source
AI summary
The composition includes a first construct having a first portion of a protein and a first antigen-recognizing amino acid sequence; and a second construct having a second portion of the protein that catalyzes a reaction when combined with the first portion of the protein and a second antigen-recognizing amino acid sequence. The first and second synthetic constructs include a sulfhydryl group configured such that a disulfide bond is formed between the first and second synthetic constructs when the first antigen-recognizing amino acid sequence and the second antigen-recognizing amino acid sequence bind an antigen.