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Phage P4 DNA replication in vitro

R Díaz Orejas1, G Ziegelin, R Lurz

  • 1Max-Planck-Institut für Molekulare Genetik, Abteilung Schuster, Berlin, Germany.

Nucleic Acids Research
|June 11, 1994
PubMed
Summary
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Bacteriophage P4 DNA replication in vitro uses P4 alpha protein and initiates at the origin, producing supercoiled DNA. Host initiation proteins are not required, but DNA polymerase III and supercoiled DNA substrates are essential.

Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • Bacteriophage P4 DNA replication was previously shown to occur in cell-free extracts of Escherichia coli with P4 alpha protein.
  • Further characterization of this in vitro system is needed to understand the replication mechanism.

Purpose of the Study:

  • To further characterize the in vitro replication of bacteriophage P4 DNA.
  • To identify the key components and mechanisms involved in P4 DNA replication.

Main Methods:

  • Modified in vitro replication assay using cell-free extracts of Escherichia coli.
  • Agarose gel electrophoresis and autoradiography to analyze replicated DNA molecules.
  • Electron microscopy to examine replication intermediates.
  • Inhibition studies using polyclonal antibodies and specific inhibitors (ara-CTP, novobiocin).

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Main Results:

  • In vitro replication yields supercoiled monomeric P4 DNA as the main product.
  • DNA synthesis initiates at the P4 origin (ori) and proceeds bidirectionally, forming theta-type molecules.
  • Host initiation proteins (DnaB, DnaG) and chaperones (DnaJ, DnaK) are not required.
  • P4 replication is inhibited by anti-SSB antibodies, ara-CTP (DNA polymerase III inhibitor), and novobiocin (DNA gyrase inhibitor).
  • Replication is independent of host RNA polymerase transcription.

Conclusions:

  • P4 DNA replication in vitro is initiated at the specific origin and proceeds bidirectionally.
  • The process relies on DNA polymerase III holoenzyme and supercoiled DNA (form I) as a substrate.
  • Bacteriophage P4 has evolved a replication mechanism that is largely independent of essential host replication initiation factors.