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Related Experiment Videos

Internucleotide protein linkers in Ehrlich ascites cell DNA.

D Werner, W Krauth, H V Hershey

    Biochimica Et Biophysica Acta
    |July 29, 1980
    PubMed
    Summary

    Proteases create nicks and gaps in Ehrlich ascites tumor cell DNA, revealing peptide/protein linkers between DNA subunits. These findings suggest a novel DNA structure in tumor cells.

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    Area of Science:

    • Molecular Biology
    • Biochemistry
    • Genetics

    Background:

    • DNA integrity is crucial for cellular function.
    • Tumor cells often exhibit unique molecular characteristics.

    Purpose of the Study:

    • To investigate the effect of proteases on Ehrlich ascites tumor cell DNA.
    • To identify the nature of protease-sensitive sites in tumor DNA.

    Main Methods:

    • Treatment of DNA with various proteases (pronase, proteinase K, trypsin, chymotrypsin, subtilisin).
    • Analysis of DNA integrity using nuclease S1 sensitivity and sedimentation rate.
    • Investigation of DNA end-blocking groups using Escherichia coli polymerase I.

    Main Results:

    • Proteases induce nicks or gaps in tumor DNA at specific sites.
    • These sites are approximately 13.5 kilobase pairs apart and suggest alternating strand arrangement.
    • DNA ends liberated by protease treatment are blocked, consistent with peptide/protein linkers.

    Conclusions:

    • Protease-sensitive sites in Ehrlich ascites tumor cell DNA are likely linked by peptide/protein structures.
    • This suggests a unique DNA organization in these tumor cells, distinct from typical DNA structures.

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