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Nanopores with an Engineered Selective Entropic Gate Detect Proteins at Nanomolar Concentration in Complex Biological
Sabine Straathof1, Giovanni Di Muccio2,3, Giovanni Maglia1
1Groningen Biomolecular Sciences & Biotechnology Institute, University of Groningen, 9747 AG, Groningen, The Netherlands.
Journal of the American Chemical Society
|April 22, 2025
Summary
This study introduces a novel nanopore sensor that uses a polypeptide mesh to detect proteins in blood. This breakthrough enables real-time protein detection for disease biomarkers without sample preparation.
Area of Science:
- Biotechnology
- Nanotechnology
- Biosensing
Background:
- Biological nanopores are effective for electrical detection of biomolecules, crucial for health monitoring.
- Detecting diverse proteins at varying concentrations in biological samples, like blood, is a significant challenge for current biosensors.
- Existing methods often require extensive sample preparation, limiting real-time applications.
Purpose of the Study:
- To develop a novel biosensing platform for sensitive and selective protein detection directly from complex biological samples.
- To engineer a biological nanopore with an integrated 'entropic gate' for improved protein discrimination.
- To enable real-time, label-free detection of disease-relevant proteins in undiluted blood samples.
Main Methods:
- Incorporation of a disordered polypeptide layer into the YaxAB biological nanopore to create an entropic gate.
- Design of specific recognition elements within the polypeptide layer for targeted protein capture.
- Electrical signal analysis of protein translocation through the engineered nanopore to identify specific current signatures.
Main Results:
- The engineered nanopore effectively filtered out non-target proteins from concentrated mixtures, including blood.
- Targeted proteins successfully penetrated the entropic gate and were detected via unique electrical signatures.
- Nanomolar concentrations of proteins were recognized directly from blood samples without any prior purification or preparation.
Conclusions:
- The developed nanopore biosensor, inspired by the nuclear pore complex, offers a robust method for protein detection in complex biological fluids.
- This technology significantly advances the potential for real-time, in-situ monitoring of protein biomarkers for early disease diagnosis.
- The findings pave the way for next-generation nanopore-based diagnostic devices for point-of-care health monitoring.
