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Studies on dinoflagellate chromosomal basic protein.

J Y Li

    Bio Systems
    |January 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Dinoflagellate chromosomes contain a basic protein similar to histone H4. This protein forms primitive nucleosome-like structures, offering insights into early chromatin evolution.

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    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Evolutionary Biology

    Background:

    • Standard cytochemical methods fail to detect basic proteins in dinoflagellate chromosomes due to DNA removal causing dissolution.
    • Eubacterial nucleoids exhibit similar behavior, highlighting a challenge in studying these unique chromosomal structures.

    Purpose of the Study:

    • To identify and characterize the basic proteins present in dinoflagellate chromosomes.
    • To investigate the structural and evolutionary implications of these proteins and their interaction with DNA.

    Main Methods:

    • Application of ammoniacal silver technique and alkaline Biebrich scarlet to preserve DNA during cytochemical analysis.
    • Extraction and urea polyacrylamide gel electrophoresis of acid-soluble proteins from *Amphidinium carterae* and *Noctiluca miliaris*.

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  • Cytochemical demonstration and amino acid composition analysis of basic proteins from *Oxyrrhis marina* chromosomes.

    • Main Results:

    • Dinoflagellate chromosomes, when preserved, show positive reactions for basic proteins using specific techniques.
    • A single basic protein band co-migrating with histone H4 was identified in *A. carterae* and *N. miliaris*.
    • *O. marina* chromosomes retain form after DNA removal, revealing a basic protein also co-migrating with histone H4 and forming nucleosome-like structures.

    Conclusions:

    • Dinoflagellates possess a histone H4-like basic protein involved in chromosomal structure.
    • This protein can form primitive nucleosome-like structures, potentially representing an early evolutionary stage of the nucleosome.
    • The findings provide insights into the evolution of chromatin and the fundamental organization of genetic material.