Target-Binding Split Reporter Assays for Homogeneous Analyte Detection
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Solution Overview
Problem
Existing immunoassays for analyte detection, such as ELISAs and western blots, are labor-intensive and time-consuming due to the need for multiple wash steps and immobilization processes, and often cannot be performed in a homogeneous solution.
Innovation Solution
The use of split reporter proteins, such as binary or ternary split enzymes, which form an active protein complex when combined, allowing for rapid and specific detection of analytes by catalyzing a luminescent signal without the need for extensive wash steps or immobilization, enabling detection in a homogeneous solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional immunoassays (ELISAs, western blots) are used for analyte detection, then specific detection can be achieved, but the process becomes labor-intensive and time-consuming due to multiple wash steps and immobilization requirements
Solution Approach 1:
The reporter protein is divided into two separate fragments (first fragment and second fragment) that are individually inactive. These fragments are fused to different binding molecules that target the analyte. When the analyte binds both binding molecules, the fragments are brought into proximity and form an active reporter complex, enabling detection without traditional wash steps.
Solution Approach 2:
The analyte acts as an intermediary that brings the two separate binding molecules into close proximity through simultaneous binding. This intermediary interaction triggers the formation of the active reporter complex, eliminating the need for manual wash steps and immobilization procedures required in traditional immunoassays.
2Measurement precision
If traditional immunoassays are used for analyte detection, then detection specificity can be achieved, but the process requires multiple wash steps and immobilization that increase labor and time requirements
Solution Approach 1:
The assay combines the detection function and the analyte-binding function into a single homogeneous solution system. The first and second binding molecules, each fused to inactive reporter fragments, are mixed with the analyte in one step. If the analyte binds both molecules, the fragments assemble into an active complex that produces a detectable signal, eliminating the need for separate wash and immobilization steps.
3Productivity
If split reporter proteins are used for analyte detection, then detection speed and simplicity are improved, but the system complexity increases due to the need for protein fragment assembly
Solution Approach 1:
The system uses the analyte itself to trigger the assembly of the reporter complex. When the analyte binds both the first and second binding molecules simultaneously, it automatically brings the inactive fragments into the correct spatial arrangement for self-assembly into the active reporter complex, producing a detectable signal without external intervention.
4Adaptability or versatility
If traditional immunoassays are used, then analyte detection can be performed, but homogeneous solution detection is not possible due to requirements for immobilization and wash steps
Solution Approach 1:
The assay is designed to function entirely in a homogeneous solution phase. The first and second binding molecules, fused to inactive reporter fragments, are dissolved in the same solution as the analyte. Upon binding, the fragments assemble into an active complex without requiring phase separation, immobilization, or wash steps, enabling detection in a single homogeneous mixture.
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 split reporter systems significantly reduce the labor and time required for analyte detection, provide a measurable signal more quickly, and enable detection in conditions not feasible with traditional immunoassays, while minimizing human error.
Implementation Method 1
a first agent and a second agent, each comprising a different portion of a split reporter protein, are delivered into a mixture... the first agent and the second agent bind to one another to form an active protein complex
Implementation Method 2
The split reporter systems significantly reduce the labor and time required for analyte detection, provide a measurable signal more quickly
Data Source
AI summary
Split enzyme reporter systems are disclosed for detecting an analyte in a mixture. Fragments of the split enzyme may be covalently bound to targeting domains that bind to target regions of an analyte, thereby causing formation of an active complex. Some split enzyme reporter systems can be used to detect an analyte without the use of analyte immobilization, blocking, or wash steps. Some reporter systems also enable rapid detection of the analyte of interest.