Bioluminescent Biosensor for Antibody Detection via Split Luciferase
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Solution Overview
Problem
Current antibody detection methods are limited by the need for multiple time-consuming incubation steps, multiple reagents, and sophisticated equipment, making them unsuitable for high-throughput screening and point-of-care applications.
Innovation Solution
A bioluminescent biosensor using intramolecular complementation of split luciferase, where a linker with binding domains is used to detect antibodies directly in solution, allowing for one-step detection and quantification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional ELISA and sandwich-type assays are used for antibody detection, then detection sensitivity is achieved, but the process becomes time-consuming and requires multiple reagents and sophisticated equipment
Solution Approach 1:
The patent merges the antibody binding function and signal generation function into a single integrated protein sensor. The sensor protein contains both the binding domain that recognizes the target antibody and the signaling domain that produces a detectable signal, eliminating the need for separate reagents and multiple incubation steps required in traditional ELISA and sandwich assays
Solution Approach 2:
The sensor protein is designed as a universal detection platform that can detect various antibodies through modular binding domains. The same sensor architecture can be adapted to detect different targets by changing the binding domain, reducing the need for multiple specialized reagents and assays
2Measurement precision
If fluorescently labeled epitopes are used for antibody detection, then detection is possible, but sensitivity is limited by the concentration of fluorescent probe and specialized instrumentation is required
Solution Approach 1:
The sensor protein performs self-activation through conformational change upon antibody binding. The binding-induced conformational change brings signaling domains into proximity, automatically generating a signal without requiring external fluorescent probes or specialized instrumentation
Solution Approach 2:
The patent utilizes conformational change as a detectable parameter to signal antibody binding. The transition between different conformational states of the sensor protein (bound vs. unbound) produces a measurable signal change that indicates the presence and concentration of the target antibody
3Ease of operation
If allosteric antibody reporter enzyme is used by inserting peptide epitopes within reporter enzyme, then antibody binding can be detected, but the enzyme becomes catalytically compromised and activity decreases
Solution Approach 1:
The sensor protein is segmented into distinct functional domains: binding domains that recognize the target antibody and signaling domains that generate the signal. This segmentation allows each domain to perform its specific function optimally without interfering with the other, avoiding the catalytic compromise that occurs when epitopes are inserted within reporter enzymes
4Ease of operation
If antibody-induced oligomerization of reporter enzymes is used, then signal generation is possible, but reconstituted enzyme activity is low (only 1-2%) compared to parent enzyme
Solution Approach 1:
The patent replaces the enzyme-based signal generation mechanism with a conformational change-based mechanism. Instead of relying on enzyme activity that is compromised during oligomerization, the sensor uses structural conformational changes that occur upon antibody binding to generate a detectable signal, achieving high sensitivity without the activity loss associated with enzyme oligomerization
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 achieves efficient detection of antibodies with a dynamic range of up to 493% at picomolar concentrations, providing a robust and sensitive method for antibody detection.
Implementation Method 1
A bioluminescent biosensor using intramolecular complementation of split luciferase
Implementation Method 2
efficient Bioluminescence Resonance Energy Transfer (BRET) between the luciferase and the fluorophore in only one of the two conformations
Data Source
AI summary
The present invention relates to a bioluminescent biosensor and use of such bioluminescent biosensor for providing a generic biosensor strategy allowing direct detection of biomolecules (e.g. antibodies) or ligands (e.g. small molecules) directly in solution.