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Related Experiment Videos

Chromatin-nuclear envelope complex from rat liver: isolation and purification.

A N Prusov, D Fais, V Y Polyakov

    Cell Biology International Reports
    |April 1, 1980
    PubMed
    Summary

    Researchers developed a novel method to isolate rat liver nuclear envelopes (NE), preserving chromatin (Ch) structure. This technique yields pure complexes with minimal non-specific chromatin adsorption, maintaining ultrastructure.

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    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Biochemistry

    Background:

    • The nuclear envelope (NE) is crucial for cellular function, but its isolation while preserving chromatin (Ch) integrity is challenging.
    • Understanding NE structure and its interaction with chromatin requires effective isolation techniques.

    Purpose of the Study:

    • To develop and describe a method for isolating nuclear envelopes (NE) from rat liver.
    • To ensure the preservation of nucleomeric chromatin (Ch) organization during NE isolation.
    • To characterize the biochemical composition of the isolated chromatin-NE complexes.

    Main Methods:

    • Mild treatment of pure nuclei with DNase I under low ionic strength and magnesium conditions.
    • Purification of NEs via sucrose gradient centrifugation and flotation.

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  • Analysis of the isolated chromatin-NE complexes for DNA, RNA, protein, and phospholipid content.

    • Main Results:

    • A method was established for isolating nuclear envelopes (NE) from rat liver, preserving chromatin (Ch) organization.
    • The isolation process resulted in complexes with less than 3% non-specific chromatin adsorption.
    • The main components, chromatin and NE, retained their in situ ultrastructure.
    • The isolated complexes comprised approximately 9-10% DNA, 3-4% RNA, 63% protein, and 24% phospholipids.

    Conclusions:

    • The described method effectively isolates nuclear envelopes (NE) while maintaining the ultrastructure of both the NE and associated chromatin (Ch).
    • This technique provides a valuable tool for studying the intricate relationship between the nuclear envelope and chromatin organization.