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Related Experiment Videos

DNA methyltransferase polypeptides in mouse and human cells.

G P Pfeifer, D Drahovsky

    Biochimica Et Biophysica Acta
    |December 18, 1986
    PubMed
    Summary

    Researchers isolated a 190 kDa DNA methyltransferase polypeptide from mouse cells using immunoaffinity chromatography. This key enzyme was also found in human cell lines and synthesized in both proliferating and non-proliferating cells.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cell Biology

    Background:

    • DNA methyltransferase (DNMT) is crucial for epigenetic regulation.
    • Understanding DNMT's structure and synthesis is vital for comprehending gene expression control.

    Purpose of the Study:

    • To isolate and characterize the DNA methyltransferase polypeptide.
    • To investigate the synthesis and presence of DNA methyltransferase in different cellular conditions.

    Main Methods:

    • Immunoaffinity chromatography using monoclonal anti-DNA methyltransferase antibodies.
    • Immunoprecipitation from mouse P815 mastocytoma cells and human cell lines (Raji, K562).
    • Analysis of polypeptide sizes and synthesis rates in proliferating and stationary phase cells.

    Main Results:

    • A 190 kDa DNA methyltransferase polypeptide was successfully isolated from mouse cells.
    • The 190 kDa polypeptide was also identified in human Raji and K562 cell lines.
    • This 190 kDa polypeptide is synthesized in both rapidly proliferating and, at lower rates, in stationary phase cells, while smaller DNMT polypeptides are not synthesized under either condition.

    Conclusions:

    • The primary form of DNA methyltransferase is a 190 kDa polypeptide.
    • This polypeptide is conserved across mouse and human cell lines.
    • DNMT synthesis is regulated by cell proliferation status, with the 190 kDa form being the predominant species synthesized.

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