Mobile SubZyme Detection Cascades for Rapid Signal Amplification
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Solution Overview
Problem
Existing nucleic acid detection assays face limitations in sensitivity and speed due to reliance on immobilized catalytic nucleic acid enzymes, which suffer from steric hindrance, diffusion restrictions, and conformational changes, leading to sub-optimal reaction rates and potential false positives.
Innovation Solution
A detection system utilizing mobile subZyme oligonucleotides with catalytic nucleic acid components separated by a permeable membrane, allowing target-dependent cleavage and release of catalytically active enzymes to amplify signals through a feedback loop independent of target concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If catalytic nucleic acid enzymes are immobilized on solid supports, then spatial separation from substrates is achieved, but reaction efficiency decreases due to steric hindrance and diffusion restrictions
Solution Approach 1:
The patent transitions from static immobilized enzymes to dynamic mobile enzyme systems. The mobile enzyme compositions can move within the reaction medium, allowing substrates to access active sites without diffusion restrictions while maintaining spatial organization through controlled movement rather than fixed attachment.
Solution Approach 2:
The patent introduces a membrane-bound compartment as an intermediary structure. This membrane enclosure provides spatial separation between enzyme compartments and substrate compartments while allowing controlled interaction through membrane permeability, avoiding the steric hindrance of direct surface immobilization.
2Reliability
If catalytic nucleic acid enzymes are tethered to fixed surfaces, then spatial organization is improved, but false positives increase due to conformational changes
Solution Approach 1:
The membrane-bound compartment acts as an intermediary that maintains spatial organization without forcing enzymes into conformational changes. The membrane provides structural organization while allowing enzymes to maintain their natural conformations and specificities, preventing false positive detections.
Solution Approach 2:
The patent changes the physical state from immobilized to mobile, altering the conformational freedom and spatial dynamics of the enzymes. This parameter change allows enzymes to maintain optimal conformations for specific substrate recognition, improving measurement precision while retaining spatial organization through mobile compartmentalization.
3Speed
If mobile enzyme systems are used, then reaction speed increases due to improved diffusion, but spatial control is reduced
Solution Approach 1:
The membrane-bound compartment serves as an intermediary that enables both mobile enzyme function for rapid diffusion and spatial control through compartmentalization. The membrane boundaries provide spatial organization while the mobile nature of the compartments within the reaction medium maintains fast reaction kinetics.
Solution Approach 2:
The patent segments the reaction system into membrane-bound compartments containing enzymes and separate substrate regions. This segmentation provides spatial control through compartmentalization while maintaining mobile enzyme systems that can rapidly diffuse within their compartments and interact with substrates at membrane interfaces.
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
Enhances reaction efficiency and specificity by maintaining enzyme accessibility and diffusion, enabling rapid and sensitive detection of target molecules with reduced false positives.
Implementation Method 1
comprising a catalytic nucleic acid enzyme component and a substrate component, wherein the catalytic nucleic acid enzyme component is larger than the pore size of the membrane
Implementation Method 2
catalytic nucleic acid enzymes which catalyse modifications to nucleic acids
Implementation Method 3
capable of cleaving or ligating RNA substrates, DNA substrates and/or chimeric DNA/RNA substrates
Data Source
Figure 1A~1B
Figure 2
Figure 3A~3B
AI summary
The present invention relates to compositions and methods for the detection of target molecules, and the amplification of detectable signals generated by detection assays. More specifically, the present invention relates to methods utilizing catalytic nucleic acid enzymes to generate and/or amplify a signal indicative of the presence of target molecules (e.g. nucleic acids and proteins), and compositions for use in the methods.