OmpG Nanopore Biosensor Heterologous Peptide Gating
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Solution Overview
Problem
Current methods for the rapid and selective detection of biomolecular indicators of disease, or biomarkers, are hindered by the complexity of patient samples and the vast repertoire of potential compounds, making cost-effective and accurate diagnostics challenging.
Innovation Solution
A nanopore-based biosensor using outer membrane protein G (OmpG) with heterologous peptides inserted into flexible loops, which alters its gating pattern upon binding to targets, allowing for the detection of specific ligands through changes in ionic current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional methods are used for biomarker detection, then detection capability is limited, but device complexity and cost increase
Solution Approach 1:
The patent modifies the physical-chemical parameters of the nanopore by inserting heterologous peptides with specific sequences into flexible loops of OmpG. These parameter changes enable the nanopore to selectively bind target biomarkers, achieving high sensitivity detection without complex instrumentation
Solution Approach 2:
The heterologous peptide acts as an intermediary element that mediates the interaction between the nanopore and target biomarker. The peptide sequence is designed to specifically bind to the target, translating molecular recognition into measurable electrical signal changes
2Reliability
If selective multiplex detection is implemented, then diagnostic accuracy improves, but manufacturing complexity increases
Solution Approach 1:
The patent divides the detection function into separate modular components by inserting different heterologous peptides into different flexible loops of OmpG. Each loop-peptide combination can independently detect a specific biomarker, enabling multiplex detection while maintaining straightforward nanopore production
Solution Approach 2:
The OmpG nanopore platform provides universal functionality for detecting multiple different biomarkers by simply changing the heterologous peptide sequence inserted into the flexible loops. This multi-functionality is achieved through a single, well-characterized protein scaffold
3Speed
If real-time detection at nanomolar concentrations is achieved, then diagnostic timeliness improves, but measurement precision requirements increase
Solution Approach 1:
The patent replaces complex mechanical or optical detection systems with an electrical measurement approach. The binding event between heterologous peptide and target biomarker directly modulates ionic current through the nanopore, enabling real-time detection with high concentration accuracy through simple electrical measurements
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 sensitive, real-time detection of biomarkers at nanomolar concentrations with high specificity, facilitating accurate diagnostics and optimal treatment decisions.
Implementation Method 1
detecting specific ligands through changes in ionic current flow
Implementation Method 2
alters its gating pattern upon binding to targets
Data Source
AI summary
Disclosed herein is a composition that involves a nanopore disposed in a membrane preparation, wherein the nanopore has an outer membrane protein G (OmpG) having 8 to 22 β-strands connected by a plurality of flexible loops on a first side of the membrane preparation and a plurality short turns on a second side of the membrane preparation, wherein a heterologous peptide is inserted within one or more of the flexible loops. Also disclosed herein is a method of detecting binding of a ligand to a target, the method involving: exposing a nanopore composition disclosed herein to a target; assessing a gating pattern of the nanopore; and detecting binding of the target to the heterologous peptide based on the gating pattern.