Nanopore-Matched Protein Shuttle for Molecular Characterization
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Solution Overview
Problem
Nanopore-based studies of molecules are challenging due to complex geometrical and electrical charge structures of protein molecules, which make it difficult to stably trap protein molecules in nanopores and effectively monitor them.
Innovation Solution
A method for characterizing shuttle capture in a nanopore sensor involves collecting time-dependent current blockage signatures for different bias voltages, classifying them into permanent and transient events, and generating protein dynamics landscapes (PDLs) to identify blockage levels and determine the preferred bias voltage for stable trapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If protein molecules are trapped in nanopores for monitoring, then molecular characterization is enabled, but stable trapping is difficult to achieve due to complex geometrical and electrical charge structures
Solution Approach 1:
The patent segments the protein molecule into functional regions (N-terminal domain, C-terminal domain, linker region) to understand how different parts interact with the nanopore. This segmentation allows for a more manageable analysis of the complex trapping mechanism and enables optimization of specific interaction zones for stable capture.
Solution Approach 2:
The patent employs parameter changes by varying the voltage bias applied to the nanopore to control the trapping process. By adjusting electrical parameters (voltage magnitude and polarity) and environmental conditions (pH, ionic strength), the system optimizes the interaction between the protein's electrical charge structure and the nanopore, enabling stable trapping despite the protein's complex charge distribution.
2Measurement precision
If nanopore-based monitoring is used for protein molecules, then molecular dynamics can be observed, but noise characteristics and stability of bond are challenging
Solution Approach 1:
The patent implements feedback mechanisms through real-time monitoring of current blockage signatures and using this information to adjust trapping conditions. The system continuously analyzes the electrical signal from the nanopore to detect protein binding events and modifies experimental parameters accordingly, improving both measurement precision and bond stability while managing noise through adaptive control.
Solution Approach 2:
The patent introduces an intermediary approach by using a controlled electrical field as a mediator between the nanopore and the protein molecule. This electrical field acts as a controllable interaction mechanism that facilitates stable bonding while allowing precise measurement of molecular dynamics through current blockage analysis, separating the measurement function from the binding function.
3Adaptability or versatility
If artificially reproduced nanopores are used, then nanopore-based studies can be conducted, but sizing and chemical, mechanical, electrical, and thermal constraints are encountered
Solution Approach 1:
The patent designs the nanopore system with multi-functionality to handle various protein molecules with different sizes and charge characteristics. The nanopore structure and associated electrical control mechanisms are configured to accommodate a range of molecular types, making the system universally applicable for studying different protein-shuttle complexes without requiring separate optimized structures for each molecule type.
Solution Approach 2:
The patent introduces dynamic control mechanisms that allow the nanopore system to adapt its electrical field strength and configuration in response to different molecular sizes and charge distributions. This dynamic adjustment capability enables the same nanopore structure to effectively study molecules across a wide size range while managing the constraints imposed by artificial nanopore geometry.
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
This method enables effective analysis and visualization of single molecule measurements, allowing for the identification of stable blockage levels and preferred voltage conditions for nanopore-based molecular characterization.
Implementation Method 1
Molecules can be trapped and electrically monitored via a nanopore
Implementation Method 2
time-dependent current blockage signatures
Data Source
AI summary
Systems and methods are provided for characterizing shuttle capture events in a nanopore sensor. The method first collects time-dependent current blockage signatures for at least one bias voltage. The method then identifies each signature as corresponding to a permanent or transient event. The method then generates a protein dynamics landscape (PDL) for the transient event signatures. The PDL comprises a set of histograms of nanopore current data and characterizes current through the nanopore during shuttle capture events. The method can then comprise identifying an entrance level blockage value based on the permanent event signatures. Permanent event captures can be determined by time duration which is larger than a certain threshold time value. Applying a voltage between the fluidic chambers above a threshold voltage level can be used to control that the vast majority of events are permanent.