Split Enzyme Fusion Protein Analyte Detection
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Solution Overview
Problem
Current detection platforms are inadequate for sensitive detection of low concentration protein and small molecule biomarkers at the point of care, relying on potentially inaccurate empirical diagnosis or expensive lab tests, and lack innovation for detecting low concentration antigens and small molecules.
Innovation Solution
A method using split enzyme constructs and fusions with receptor proteins to form a complex with analytes, creating a self-amplifying enzymatic pathway that generates cAMP, which drives a feedback loop for sensitive detection, employing adenylate cyclase and cAMP receptor protein to amplify signals and detect analytes through a FRET-based fluorescence shift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional detection platforms are used, then detection can be performed, but sensitivity for low concentration biomarkers is insufficient
Solution Approach 1:
The patent employs a feedback mechanism where the analyte-binding event triggers an enzymatic cascade that amplifies the signal. The split enzyme fragments are brought together by analyte binding, reconstituting active enzyme that catalyzes substrate conversion, creating a measurable signal that feeds back to indicate analyte presence and concentration.
Solution Approach 2:
The detection system uses segmented enzyme constructs (split enzymes) that are separated into inactive fragments. These fragments are distributed on different beads or particles. When analyte is present, it brings the segmented enzyme fragments together, reconstituting active enzyme only in the presence of the target analyte, enabling specific and sensitive detection.
2Speed
If point of care detection is implemented, then rapid detection is achieved, but detection sensitivity for low concentration analytes deteriorates
Solution Approach 1:
The system performs preliminary actions by pre-preparing segmented enzyme fragments on beads and pre-mixing necessary reagents. When sample is introduced, the detection reaction can proceed immediately without extensive preparation, enabling rapid point-of-care testing while maintaining sensitivity through the pre-positioned enzyme fragments that await analyte binding.
Solution Approach 2:
The detection system is designed to be self-service at the point of care, requiring minimal operator intervention. The segmented enzyme fragments automatically reconstitute upon analyte binding, and the enzymatic cascade proceeds autonomously, generating detectable signals without complex equipment or specialized technical expertise.
3Ease of manufacture
If empirical diagnosis is used, then detection can proceed without advanced technology, but accuracy deteriorates
Solution Approach 1:
The patent replaces complex mechanical or laboratory-based detection systems with a simplified biochemical assay using segmented enzymes and bead-based detection. This substitution maintains ease of manufacture and point-of-care accessibility while dramatically improving diagnostic accuracy through enhanced sensitivity and specificity of the enzymatic detection mechanism.
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
Enables rapid, ultrasensitive detection of analytes at low concentrations, providing a platform for detecting a wide range of biomarkers with high sensitivity and specificity, overcoming limitations of existing technologies by translating binding events into detectable readouts.
Implementation Method 1
the first fragment of the first cAMP catalyzing enzyme and the second fragment of the first cAMP catalyzing enzyme when complexed as a protein-analyte-protein complex perform a function of the cAMP catalyzing enzyme
Implementation Method 2
detecting a concentration of the analyte based on the measured cAMP concentration
Data Source
AI summary
A method for detecting an analyte is described in which the simultaneously binding of two fusion proteins (i.e., a sandwich assay in solution) is used, bringing two halves of a split enzyme together to produce product, which is detected via a FRET-based biosensor. The method may incorporate an autocatalytic feedback loop that responds to enzymatic product by producing more product to provide ultrasensitive, bistable detection of analyte that is tunable over several orders of magnitude. This system is broadly applicable for protein and small molecule detection.