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Related Experiment Videos

Histone-histone interactions within chromatin. Crosslinking studies using ultraviolet light.

H G Martinson, M D Shetlar, B J McCarthy

    Biochemistry
    |May 4, 1976
    PubMed
    Summary

    UV irradiation covalently links histone 2A and 2B proteins within chromatin, forming a dimer. This specific cross-linking reaction, yielding about 80% dimer, depends on histone conformation and DNA binding.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Structural Biology

    Background:

    • Histones are crucial proteins that package DNA into chromatin.
    • Histone-histone interactions play a role in chromatin structure and function.
    • UV irradiation can induce cross-linking between biomolecules.

    Purpose of the Study:

    • To investigate the UV-induced cross-linking between histone 2A (H2A) and histone 2B (H2B).
    • To determine the specificity and yield of H2A-H2B dimer formation.
    • To explore the influence of DNA and ionic strength on histone cross-linking.

    Main Methods:

    • Irradiation of whole cells and isolated chromatin at 280 nm.
    • Irradiation of reconstituted nucleohistone complexes (H2A, H2B, DNA).
    • Analysis of cross-linked products to identify H2A-H2B dimers.

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    Main Results:

    • UV irradiation at 280 nm specifically cross-links H2A and H2B with high yield (~80%).
    • The H2A-H2B dimer is formed in reconstituted nucleohistone containing only H2A, H2B, and DNA.
    • Maximum cross-linking specificity requires histones bound to DNA at low ionic strength.
    • Histone interaction precedes DNA deposition for efficient dimer formation.
    • DNA-histone cross-linking predominates at 254 nm.

    Conclusions:

    • UV irradiation at 280 nm is a specific method for studying H2A-H2B interactions.
    • The conformation of the H2A-H2B pair, influenced by DNA binding, is critical for cross-linking.
    • The findings provide insights into histone-DNA interactions and chromatin assembly.