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[Secondary structure of histones in solution]
Molekuliarnaia Biologiia
|September 1, 1983
Summary
Histone H2B and H3 secondary structures were analyzed using infrared spectroscopy. Aggregation favored pleated sheet formation, with physiological conditions showing specific alpha-helix and pleated sheet percentages in histones.
Area of Science:
- Biochemistry
- Structural Biology
- Spectroscopy
Background:
- Histones are crucial for DNA packaging in chromatin.
- Understanding histone secondary structure is key to chromatin organization.
Purpose of the Study:
- To quantitatively analyze the secondary structure of histones H2B and H3.
- To investigate histone-protein interactions in various mixtures.
- To correlate histone structure with function in chromatin.
Main Methods:
- Infrared spectroscopy was employed to study histone secondary structures.
- Heavy water solutions were used to probe histone conformations.
- Equimolar mixtures of different histones were analyzed.
Main Results:
- Aggregation of H2B and H3 induced pleated sheet structure formation.
- Under physiological conditions, H2B and H3 showed distinct percentages of alpha-helix and pleated sheet structures.
- Histone mixtures (except H2A-H4) exhibited interactions reducing antiparallel pleated sheet content.
Conclusions:
- Histone secondary structure in chromatin resembles self-associated states.
- In nucleosomes, DNA, alpha-helix, and antiparallel pleated sheet structures are present in a 1:1:1 ratio.