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Related Experiment Videos

Eucaryotic primase.

Y F Roth

    European Journal of Biochemistry
    |June 15, 1987
    PubMed
    Summary
    This summary is machine-generated.

    Eukaryotic primase, essential for DNA replication initiation, synthesizes short RNA primers. Its activity is modulated by nucleotide concentrations and template interactions.

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    Area of Science:

    • Molecular Biology
    • Enzymology
    • Biochemistry

    Background:

    • Eukaryotic primase is a crucial enzyme for initiating DNA replication.
    • It is closely associated with DNA polymerase alpha or yeast DNA polymerase I.
    • The enzyme likely exists as a heterodimer.

    Purpose of the Study:

    • To characterize the properties and function of eukaryotic primase.
    • To investigate the factors influencing primase activity and site selection.
    • To understand the role of primase in DNA replication initiation.

    Main Methods:

    • Enzyme purification and characterization (sedimentation analysis).
    • In vitro synthesis of oligoribonucleotides using natural single-stranded DNA templates.
    • Assays to determine primase activity and dependence on nucleotide concentrations (ATP, GTP).

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    Main Results:

    • Eukaryotic primase synthesizes oligoribonucleotides of approximately eight residues, initiated with a purine.
    • The polymerase-primase complex initiates synthesis and pauses at specific sites on single-stranded DNA templates.
    • ATP and GTP concentrations regulate the frequency of primase site recognition.
    • Primase demonstrates strong ATP dependence with single-stranded DNA and poly(dT), and efficient oligo(rG) synthesis with poly(dC).

    Conclusions:

    • Eukaryotic primase plays a vital role in initiating DNA replication by synthesizing RNA primers.
    • Primase activity and template site selection are modulated by the cellular nucleotide environment.
    • The enzyme's characteristics suggest a specific mechanism for initiating DNA synthesis.