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Monitoring Protein Adsorption with Solid-state Nanopores
Published on: December 2, 2011
Toward detection of DNA-bound proteins using solid-state nanopores: insights from computer simulations
Jeffrey Comer1, Anthony Ho, Aleksei Aksimentiev
1Department of Physics and Beckman Institute, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
Electrophoresis
|November 14, 2012
Summary
This study uses molecular dynamics simulations to show how nanopores can detect DNA-binding proteins. Changes in DNA strain within the nanopore signal protein capture and complex rupture, enabling new detection methods.
Area of Science:
- Biophysics
- Nanotechnology
- Molecular Biology
Background:
- Nanopores offer a promising platform for single-molecule analysis.
- Detecting DNA-binding proteins is crucial for biological research and diagnostics.
- Current methods for protein-DNA interaction analysis can be complex and time-consuming.
Purpose of the Study:
- To explore the use of nanopores for detecting and identifying DNA-binding proteins.
- To elucidate the molecular mechanisms of protein-DNA complex rupture within nanopores.
- To propose a novel method for DNA-binding protein detection.
Main Methods:
- All-atom molecular dynamics simulations of DNA-bound proteins translocating through nanopores.
- Modeling of restriction enzymes (EcoRI, BamHI) and streptavidin/NeutrAvidin with DNA.
- Simulation of electrophoretic transport and analysis of ionic current and electrostatic potential.
Main Results:
- Simulations revealed the mechanics of nanopore-induced protein-DNA complex rupture.
- Electrophoretic forces and DNA-surface interactions influence rupture.
- Changes in dsDNA strain, reflected in ionic current and electrode potential, indicate complex rupture.
Conclusions:
- Nanopore ionic current and local electrostatic potential can report DNA capture, protein capture, and bond rupture.
- DNA strain changes are key indicators of protein-DNA complex integrity.
- A new detection method based on electrophoretic peeling of nicked dsDNA in nanopores is proposed.
