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Updated: Jun 28, 2026

Monitoring Protein Adsorption with Solid-state Nanopores

Monitoring Protein Adsorption with Solid-state Nanopores

Published on: December 2, 2011

Nanopore Passport Control for Substrate-Specific Translocation.

Devika Vikraman¹, Remya Satheesan^1,2, K Santhosh Kumar¹

¹Membrane Biology Laboratory, Interdisciplinary Research Program , Rajiv Gandhi Centre for Biotechnology , Thiruvananthapuram 695014 , India.

|January 25, 2020

Summary

This summary is machine-generated.

This study reveals how the bacterial nanopore CymA selectively transports carbohydrate polymers. Its unique structure facilitates specific binding and translocation of molecules like cyclic hexasaccharides, enabling advanced biopolymer characterization.

Keywords:

binding kinetics membrane pores nanopore oligosaccharides translocation

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Area of Science:

Nanobiotechnology
Biophysics
Molecular Biology

Background:

Membrane protein pores are crucial for nanobiotechnology and single-molecule detection of biomolecules.
Understanding substrate specificity in nanopores is key for developing advanced characterization tools.

Purpose of the Study:

To define the molecular basis of carbohydrate polymer translocation through the bacterial nanopore CymA.
To elucidate the real-time translocation mechanism of cationic cyclic oligosaccharides.
To investigate the role of CymA's structure in substrate selectivity.

Main Methods:

Single-channel recordings were used to study CymA nanopore activity.
Kinetics of cationic cyclic oligosaccharide binding were determined.
Translocation mechanisms for various oligosaccharides were analyzed in real-time.

Main Results:

CymA exhibits high-affinity binding for cationic cyclic hexasaccharides at its extracellular side, driven by voltage.
Translocation directionality was confirmed by increased dissociation rates with higher voltages.
Larger cyclic octasaccharides caused pore blockage, indicating strong binding, while uncharged oligosaccharides translocated via electroosmotic flow.
CymA favors translocation of cyclic hexasaccharide and linear maltooligosaccharides.

Conclusions:

The N-terminus segment and asymmetrical charge pattern of CymA regulate substrate transport, conferring specificity.
CymA's sophisticated geometry and substrate specificity make it a promising tool for complex biopolymer characterization.
This research provides insights into nanopore-based sensing and molecular transport mechanisms.