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Related Experiment Videos

Visualization of nucleosomal substructure in native chromatin by atomic force microscopy

L D Martin1, J P Vesenka, E Henderson

  • 1Department of Zoology and Genetics, Iowa State University, Ames 50011, USA.

Biochemistry
|April 11, 1995
PubMed
Summary

Atomic force microscopy visualized Tetrahymena thermophila rDNA chromatin, revealing a 30 nm fiber structure. Researchers observed nucleosome cores containing histone subunits, offering insights into chromatin organization.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Chromatin Structure

Background:

  • Understanding chromatin structure is crucial for gene regulation.
  • The nucleosome is the fundamental unit of DNA packaging.
  • High-resolution imaging techniques are needed to visualize chromatin at the molecular level.

Purpose of the Study:

  • To visualize the structure of intact rDNA minichromosomes from Tetrahymena thermophila using atomic force microscopy (AFM).
  • To investigate the arrangement of nucleosome cores and histone subunits within native chromatin fibers.
  • To assess the potential of AFM for localizing individual proteins in condensed chromatin.

Main Methods:

  • Isolation of intact rDNA minichromosomes as native chromatin from Tetrahymena thermophila.

Related Experiment Videos

  • Imaging of condensed and dispersed rDNA chromatin using atomic force microscopy (AFM).
  • Analysis of high-resolution images to identify nucleosome core substructure and histone arrangements.

    • Main Results:

    • AFM revealed a 30 nm fiber structure in condensed rDNA chromatin, with 87% of molecules showing zig-zag nucleosome core arrangements.
    • High-resolution AFM imaging of dispersed chromatin showed partially dissociated nucleosome cores with visible histone subunits.
    • Observed nucleosome core substructure resembled modeled views of the histone octamer, suggesting direct visualization of histone arrangements.

    Conclusions:

    • AFM can provide high-resolution images of native chromatin, revealing the zig-zag conformation of nucleosome cores in a 30 nm fiber.
    • Direct visualization of histone subunits within nucleosome cores demonstrates AFM's capability to resolve molecular details in chromatin.
    • This study highlights AFM as a powerful tool for studying chromatin organization and protein localization in complex biological systems.