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Related Experiment Videos

DNA primase. Processivity and the primase to polymerase alpha activity switch.

R D Kuchta1, B Reid, L M Chang

  • 1Department of Chemistry and Biochemistry, University of Colorado, Boulder 80309-0215.

The Journal of Biological Chemistry
|September 25, 1990
PubMed
Summary

Calf thymus DNA primase produces short DNA primers. Lowering temperature enhances longer primer synthesis by influencing enzyme dissociation and activity switching, crucial for DNA replication.

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Area of Science:

  • Molecular Biology
  • Enzymology

Background:

  • Calf thymus DNA primase synthesizes short RNA primers for DNA replication.
  • Understanding its processivity is key to DNA synthesis mechanisms.

Purpose of the Study:

  • To investigate the kinetic parameters governing calf thymus DNA primase's unusual processivity.
  • To elucidate the factors influencing primer length and primase-polymerase activity switching.

Main Methods:

  • Kinetic analysis of DNA primase activity at different temperatures (25°C and 37°C).
  • Analysis of primer product lengths and enzyme dissociation rates.
  • Assessment of primase-polymerase activity switch efficiency.

Main Results:

  • At 37°C, primase predominantly produced 2-3 and 8-9 nucleotide primers.

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  • Lowering temperature to 25°C significantly increased the production of longer primers (16-18 nucleotides).
  • Primer completion, not dNTP concentration, signals the switch from primase to polymerase activity, which is less efficient at 37°C.

    • Conclusions:

    • DNA primase processivity is regulated by enzyme dissociation and ATP binding.
    • Temperature critically affects primer length by influencing enzyme dissociation and the primase-polymerase switch.
    • Primer-template stability at higher temperatures may hinder efficient polymerase activity switching.