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Imaging biological structures with the cryo atomic force microscope

Y Zhang1, S Sheng, Z Shao

  • 1Department of Molecular Physiology and Biological Physics, University of Virginia School of Medicine, Charlottesville 22908, USA.

Biophysical Journal
|October 1, 1996
PubMed
Summary
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Cryo-atomic force microscopy (AFM) overcomes biological sample deformation and thermal motion, significantly improving imaging resolution compared to room temperature AFM. This technique offers high-resolution visualization of diverse biomolecules and cellular structures.

Area of Science:

  • Biophysics
  • Materials Science
  • Microscopy Techniques

Background:

  • Biological atomic force microscopy (AFM) faces limitations due to sample softness and thermal motion, hindering high-resolution imaging.
  • High pressure from sharp AFM tips can deform or damage delicate biological specimens.
  • Molecular motion at room temperature introduces artifacts and reduces image clarity.

Purpose of the Study:

  • To investigate the application and effectiveness of atomic force microscopy operated in liquid nitrogen vapor (cryo-AFM) for biological samples.
  • To assess the resolution improvements offered by cryo-AFM compared to conventional room-temperature AFM.
  • To identify remaining technical challenges and explore future applications of cryo-AFM.

Main Methods:

  • Utilized an atomic force microscope (AFM) adapted for operation in a liquid nitrogen vapor environment (cryo-AFM).

Related Experiment Videos

  • Applied cryo-AFM to image a range of biological specimens, including immunoglobulins, DNA, and cell surfaces.
  • Compared imaging resolution achieved with cryo-AFM against room-temperature AFM for similar samples.

    • Main Results:

    • Cryo-AFM successfully imaged diverse biological samples, demonstrating broad applicability.
    • Significantly improved resolution was achieved with cryo-AFM compared to room-temperature AFM.
    • Cryo-AFM resolution is comparable to cryo-electron microscopy for randomly oriented macromolecules.

    Conclusions:

    • Cryo-AFM effectively mitigates issues of sample deformation and thermal motion, enabling higher resolution imaging of biological specimens.
    • The technique shows promise for visualizing biomolecules and cellular structures with unprecedented detail.
    • Further technical development is needed to fully realize the potential of cryo-AFM for even higher resolution applications.