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Related Experiment Videos

Functional organization of the plasmid pT181 replication origin.

M L Gennaro1, S Iordanescu, R P Novick

  • 1Public Health Research Institute, New York, NY 10016.

Journal of Molecular Biology
|January 20, 1989
PubMed
Summary

The staphylococcal plasmid pT181 origin of replication requires a specific DNA sequence for initiation by the RepC protein. This study identifies the minimal sequence essential for plasmid replication and RepC binding.

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Area of Science:

  • Molecular Biology
  • Microbial Genetics
  • Plasmid Replication

Background:

  • Staphylococcal plasmid pT181 replication is initiated by the RepC initiator protein at the origin (ori).
  • Understanding the precise DNA sequence requirements of the ori is crucial for elucidating replication mechanisms.

Purpose of the Study:

  • To determine the minimal DNA sequence essential for staphylococcal plasmid pT181 origin function.
  • To investigate the sequence requirements for RepC binding and nicking activity within the minimal origin.

Main Methods:

  • Deletion analysis to identify functional regions of the origin.
  • Point mutagenesis within the minimal origin to assess sequence-specific requirements.
  • In vivo and in vitro replication and competition assays.

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  • RepC-mediated nicking assays.

    • Main Results:

    • A 70 base-pair sequence is required for full origin function, including competition for RepC.
    • A shorter 43 base-pair sequence is sufficient for origin function under non-competitive conditions.
    • Specific sequence elements within the 43 base-pair minimal origin are critical for replication and RepC interaction.

    Conclusions:

    • The study precisely defines the minimal DNA sequence necessary for staphylococcal plasmid pT181 replication initiation.
    • Identified sequence elements are critical for both replication and the RepC initiator protein's function.