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Updated: May 17, 2026

Visualization of Recombinant DNA and Protein Complexes Using Atomic Force Microscopy

Visualization of Recombinant DNA and Protein Complexes Using Atomic Force Microscopy

Published on: July 18, 2011

Atomic force microscopy imaging of macromolecular complexes.

Sergio Santos¹, Daniel Billingsley, Neil Thomson

¹Department of Oral Biology, University of Leeds, Leeds, UK.

Methods in Molecular Biology (Clifton, N.J.)

|October 23, 2012

Summary

This summary is machine-generated.

Amplitude Modulation Atomic Force Microscopy (AM AFM) in air enables high-resolution imaging of macromolecules. Precise control of parameters, especially humidity, optimizes resolution and minimizes sample wear for reliable biological imaging.

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Area of Science:

Biophysics
Materials Science
Nanotechnology

Background:

Atomic Force Microscopy (AFM) is a versatile tool for biological imaging.
Amplitude Modulation (AM) AFM in air offers potential for high-resolution studies of macromolecules.
Understanding environmental factors like humidity is crucial for AFM imaging.

Purpose of the Study:

To review AM AFM in air for high-resolution imaging of macromolecular complexes.
To elucidate the influence of relative humidity on AFM resolution and contrast.
To define and describe AFM tip-sample interaction regimes in air.

Main Methods:

Review of AM AFM principles and applications.
Analysis of relative humidity effects on DNA imaging and conformational changes.
Definition of four AFM tip-sample interaction regimes based on water perturbation and contact.
Introduction of Small Amplitude Small Set-point (SASS) imaging for enhanced resolution.

Main Results:

Relative humidity significantly impacts resolution, contrast, and DNA conformational switching.
Four distinct AFM tip-sample interaction regimes in air were identified and explained.
SASS imaging maximizes resolution while reducing tip/sample wear and noise.
Reliable control of AM AFM parameters allows high-resolution, reproducible imaging of diverse samples.

Conclusions:

AM AFM in air, with precise parameter control, is effective for high-resolution imaging of macromolecules and complexes.
Understanding and managing humidity is key to optimizing AFM imaging outcomes.
SASS imaging represents a high-resolution mode that preserves sample integrity and reduces operational artifacts.