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Noncovalent Attractions in Biomolecules

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...

Noncovalent Attractions in Biomolecules

Noncovalent Attractions in Biomolecules

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Related Experiment Video

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Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores

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Published on: October 31, 2013

Nanopore Stochastic Sensing Based on Non-covalent Interactions.

Xiaohan Chen¹, Youwen Zhang¹, Pearl Arora¹

¹Department of Chemistry, Illinois Institute of Technology, 3101 S. Dearborn Street, Chicago, Illinois 60616, United States.

Analytical Chemistry

|July 28, 2021

Summary

Engineered nanopores with non-covalent interactions can detect various species. This sensing strategy differentiates molecules within classes and even similar structures for medical and environmental applications.

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Area of Science:

Nanotechnology
Biophysics
Analytical Chemistry

Background:

Nanopore sensing offers label-free detection of molecules.
Traditional nanopore sensors often rely on specific molecular recognition.
Developing sensors selective for classes of molecules is advantageous for broad applications.

Purpose of the Study:

To engineer nanopores with non-covalent interaction sites for species detection.
To demonstrate the selectivity of these engineered nanopores for different classes of molecules.
To showcase the capability of differentiating similar molecules based on their interaction signatures.

Main Methods:

Engineering nanopores with recognition sites utilizing electrostatic, aromatic, and hydrophobic interactions.
Utilizing single-channel recording techniques to confirm the existence of engineered binding sites.
Analyzing current modulations (amplitude, residence time, voltage-dependence) for species identification.

Main Results:

Successfully engineered nanopores with non-covalent interaction sites.
Demonstrated selective detection of various species based on interaction type (cationic, anionic, aromatic, hydrophobic).
Showcased the ability to differentiate molecules within the same class and those with similar structures or molecular weights.

Conclusions:

Non-covalent interaction-based nanopore sensing provides a versatile platform for molecular detection.
This strategy enables selective identification of molecular classes and differentiation of similar species.
The developed nanopore sensor holds potential for detecting medically and environmentally important molecules.