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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
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.
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:
- 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.