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Related Experiment Videos

Stability of coliphage lambda DNA replication initiator, the lambda O protein.

G Wegrzyn1, A Pawlowicz, K Taylor

  • 1Department of Molecular Biology, University of Gdańsk, Poland.

Journal of Molecular Biology
|August 5, 1992
PubMed
Summary

Coliphage lambda O protein, crucial for DNA replication, rapidly degrades but a stable fraction exists. This stable lambda O protein, protected within replication complexes, influences replication control and is essential for plasmid replication in certain conditions.

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Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • Coliphage lambda DNA replication initiation relies on the lambda O protein.
  • Understanding lambda O protein's stability and degradation is key to comprehending replication control.
  • Previous studies noted rapid lambda O protein decay, but a stable fraction's existence was unconfirmed.

Purpose of the Study:

  • To investigate the proteolytic degradation of coliphage lambda O protein.
  • To characterize the stability of lambda O protein during DNA replication.
  • To explore the role of stable lambda O protein in replication complex formation and plasmid replication.

Main Methods:

  • Immunoprecipitation of 35S-labeled lambda O protein from infected or plasmid-harboring cells.
  • Pulse-chase experiments to assess lambda O protein decay rates.

Related Experiment Videos

  • Analysis of lambda O protein stability in wild-type and mutant Escherichia coli strains (recA, relA) under various conditions (e.g., UV irradiation, amino acid starvation).

    • Main Results:

    • Confirmed rapid decay of lambda O protein (half-life of 80 seconds) but demonstrated a stable fraction (up to 20% in standard experiments).
    • Showed that stable lambda O protein increases with longer pulse times, suggesting continuous formation of a protease-resistant form.
    • Identified that recA+ cells irradiated with UV light prior to infection lack stable lambda O, unlike recA- counterparts, indicating recA interference.
    • Found stable lambda O protein responsible for lambda O-dependent plasmid replication in amino acid-starved relA cells, even without new synthesis.

    Conclusions:

    • A significant fraction of synthesized lambda O protein becomes stable, likely by incorporation into replication complexes.
    • The existence of stable lambda O protein challenges its role as the sole limiting initiator protein for replication control.
    • RecA function is implicated in forming normal replication complexes in UV-irradiated bacteria.
    • Stable lambda O protein plays a crucial role in specific replication scenarios, such as in relA mutant cells.