Multicomponent Nucleic Acid Enzymes for Stable Detection
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Solution Overview
Problem
There is a need for simple, fast, and cost-effective methods for detecting, identifying, and quantifying nucleic acid sequences and other entities using catalytic nucleic acids, particularly DNAzymes and ribozymes, which face challenges in stability, modification tolerance, and noise due to amplification processes.
Innovation Solution
The development of multicomponent nucleic acid enzymes (MNAzymes) composed of self-assembling oligonucleotide components with substrate arm, catalytic core, and sensor arm portions, which form a catalytically active enzyme in the presence of an assembly facilitator, allowing for specific substrate modification and detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If DNAzymes are used for detection, then stability is improved, but modification tolerance is reduced
Solution Approach 1:
The DNAzyme is divided into multiple oligonucleotide components that self-assemble only in the presence of the target sequence. This segmentation allows each component to be optimized for stability while the assembled complex provides the catalytic function with inherent modification tolerance through the collective binding of multiple components to the target.
Solution Approach 2:
The invention creates a composite system where multiple oligonucleotide components with different properties (stability, binding affinity, catalytic activity) are assembled together. The resulting MNAzyme combines the stability of DNA structures with the catalytic functionality, achieving both improved stability and maintained modification tolerance through the composite nature of the multicomponent system.
2Measurement precision
If amplification processes are used for detection, then sensitivity is improved, but noise is increased
Solution Approach 1:
The oligonucleotide components are designed to self-assemble into the catalytically active MNAzyme structure only when the target sequence is present. This preliminary assembly step occurs before the catalytic amplification process, ensuring that signal generation is initiated only from specific target-bound complexes, thereby reducing background noise while maintaining amplification sensitivity.
Solution Approach 2:
The target sequence acts as an intermediary that brings the oligonucleotide components together to form the active MNAzyme. This intermediary role ensures that the amplification process is specifically triggered only when the target is present, distinguishing true signals from background noise through the requirement of target-mediated assembly.
3Measurement precision
If multicomponent MNAzymes are formed, then specificity is improved, but device complexity is increased
Solution Approach 1:
The oligonucleotide components possess self-complementary sequences that enable them to automatically find and bind to each other in the correct orientation when the target is present. This self-assembly capability eliminates the need for complex external assembly mechanisms, achieving high specificity through the intrinsic properties of the oligonucleotides while keeping the system relatively simple.
Solution Approach 2:
Multiple oligonucleotide components with different functions (binding, catalysis, stability) are merged into a single functional MNAzyme complex through self-assembly. This merging approach achieves high specificity by combining multiple recognition elements while presenting a unified catalytic entity, effectively reducing the functional complexity despite the multicomponent nature of the system.
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
MNAzymes enable efficient detection and quantification of nucleic acid sequences by forming only in the presence of specific targets, providing a stable and robust method with reduced noise, leveraging the stability and catalytic properties of DNAzymes over ribozymes.
Implementation Method 1
at least a first oligonucleotide component and a second oligonucleotide component self-assemble in the presence of an MNAzyme assembly facilitator to form a catalytically active multi-component nucleic acid enzyme (MNAzyme)
Implementation Method 2
the catalytic core portions...act as a catalytic core of the MNAzyme; said catalytic core capable of modifying at least one substrate
Data Source
AI summary
The present invention relates to Multicomponent Nucleic Acid Enzymes (MNAzymes) and methods for their use. MNAzymes comprise two or more oligonucleotide components which self-assemble in the presence of one or more MNAzyme assembly facilitator molecules to form a catalytically active structure. Compositions for making MNAzymes, and collections of MNAzymes are provided. Also provided are methods for using MNAzymes for the detection, identification and/or quantification of one or more targets. The methods can be practiced in solution-based assays or in assays where one or more reaction components are attached to a support structure. The methods allow for multiplexing the MNAzyme detection to detect multiple targets in a single reaction. Also provided are kits for making the compositions, and for practicing the methods provided herein.