Single-Enzyme Molecular Sensor Circuit for High Signal-to-Noise Detection
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Solution Overview
Problem
Existing molecular sensors lack the ability to detect a wide range of ligands with improved signal-to-noise ratios, making it difficult to distinguish informative molecular interactions from non-informative noise.
Innovation Solution
A molecular sensor comprising a single enzyme molecule directly connected to positive and negative electrodes forms a conductive pathway, utilizing arm molecules like double-stranded oligonucleotides or graphene-like nanoribbons to enhance signal-to-noise levels, and incorporating polymerases to sense sequence information from DNA templates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional molecular sensors are used, then device complexity is reduced, but signal-to-noise ratio deteriorates making it difficult to distinguish informative molecular interactions from noise
Solution Approach 1:
The patent segments the molecular sensing circuit into distinct functional components: individual enzyme molecules are isolated as discrete sensing units, each connected to electrodes through separate arm molecules. This segmentation allows each enzyme to function as an independent signal source, improving the distinguishability of informative signals from noise while maintaining manageable circuit complexity through modular design
Solution Approach 2:
The patent introduces arm molecules as intermediary components that bridge the enzyme molecules and electrodes. These arm molecules serve as conductive pathways that enhance signal transmission while filtering out noise, thereby improving the signal-to-noise ratio without requiring direct complex connections between enzymes and electrodes
2Measurement precision
If single molecule enzyme-based circuits are used, then measurement precision is improved with highly informative signals, but device complexity increases requiring direct connection of enzyme to both electrodes
Solution Approach 1:
The patent creates a universal molecular circuit architecture where a single enzyme molecule can serve multiple functions: it acts as both the sensing element and the signal generation source, while the arm molecules provide universal conductive connectivity to both electrodes. This multi-functional design enables highly informative signals while standardizing the circuit structure to manage complexity
Solution Approach 2:
The patent replaces traditional complex mechanical or electrical circuit structures with a simplified biological-molecular system. Instead of using complex electrode arrangements or multiple intermediary components, the system uses a single enzyme molecule connected through arm molecules to both electrodes, substituting molecular-scale biology for macro-scale circuit complexity
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 sensor provides highly informative signals with improved signal-to-noise ratios, enabling detailed detection of enzyme-substrate engagements.
Implementation Method 1
an enzyme connected to both the positive and negative electrodes to form a conductive pathway between the positive and negative electrodes
Implementation Method 2
a polymerase enzyme connected to both the positive and negative electrodes to form a conductive pathway between the positive and negative electrodes, wherein the sensor is usable to sense sequence information from a DNA template processed by the polymerase
Data Source
AI summary
In various embodiments a molecular circuit is disclosed. The circuit comprises a negative electrode, a positive electrode spaced apart from the negative electrode, and an enzyme molecule conductively attached to both the positive and negative electrodes to form a circuit having a conduction pathway through the enzyme. In various examples, the enzyme is a polymerase. The circuit may further comprise molecular arms used to wire the enzyme to the electrodes. In various embodiments, the circuit functions as a sensor, wherein electrical signals, such as changes to voltage, current, impedance, conductance, or resistance in the circuit, are measured as substrates interact with the enzyme.