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High-resolution structure of the native histone octamer.

Christopher M Wood1, James M Nicholson, Stanley J Lambert

  • 1School of Biomolecular Sciences, Liverpool John Moores University, Liverpool L3 3AF, England. c.m.wood@livjm.ac.uk

Acta Crystallographica. Section F, Structural Biology and Crystallization Communications
|March 3, 2006
PubMed
Summary

High-resolution X-ray crystallography revealed the structure of histone octamers, detailing interactions crucial for nucleosome stability and remodelling. This provides insights into how RNA polymerase II interacts with core histones.

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Area of Science:

  • Structural Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Histone octamers form the core of nucleosomes, fundamental units of DNA packaging.
  • Understanding histone-histone interactions is key to deciphering DNA accessibility and gene regulation.

Purpose of the Study:

  • To determine the high-resolution crystal structure of the native histone octamer.
  • To analyze intermolecular interactions within the histone octamer relevant to nucleosome function and remodelling.

Main Methods:

  • X-ray diffraction crystallography of chick erythrocyte histone octamers.
  • Structure determination to 1.90 Å resolution.
  • Analysis of intermolecular contacts and water molecule positions.

Main Results:

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  • A high-resolution (1.90 Å) structure of the histone octamer was obtained.
  • Detailed analysis of interactions, including H2A'-H3-H4, H4-H2B', and H2A'-H4 beta-sheet interactions.
  • Identified the H2A'-H4 beta-sheet interaction as a potential binding site for RNA polymerase II, crucial for nucleosome remodelling.

Conclusions:

  • The high-resolution histone octamer structure provides critical insights into nucleosome assembly and dynamics.
  • The H2A'-H4 interaction is implicated in nucleosome remodelling by RNA polymerase II.
  • The octamer model serves as a valuable resource for comparative studies with nucleosome-core particle structures.