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Related Experiment Videos

Stringent control of replication of plasmids derived from coliphage lambda.

G Wegrzyn1, P Neubauer, S Krueger

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

Molecular & General Genetics : MGG
|January 1, 1991
PubMed
Summary
This summary is machine-generated.

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Bacterial plasmid replication, specifically lambda plasmid replication, continues for hours in amino acid-starved relaxed cells, unlike stringent cells. This process depends on the lambda O protein and is regulated by stringent control mechanisms.

Area of Science:

  • Molecular Biology
  • Bacteriology
  • Genetics

Background:

  • Lambda plasmid replication initiates with RNA polymerase activation and lambda O protein binding.
  • Lambda O protein undergoes rapid degradation, suggesting amino acid starvation should inhibit replication.

Purpose of the Study:

  • To investigate the regulation of lambda plasmid replication under amino acid starvation conditions.
  • To determine the role of stringent control in lambda plasmid replication.

Main Methods:

  • Comparing lambda plasmid replication in amino acid-starved relaxed mutants versus stringent wild-type Escherichia coli.
  • Assessing lambda O protein dependence and inhibition by chloramphenicol.

Main Results:

Related Experiment Videos

  • Lambda plasmid replication persisted for hours in amino acid-starved relaxed cells, contrary to predictions.
  • Replication in starved relaxed cells showed absolute lambda O dependence and was not inhibited by chloramphenicol.
  • Replication occurred in chloramphenicol-treated wild-type cells.

    • Conclusions:

    • Lambda plasmid replication is under stringent control, likely mediated by ppGpp's effect on RNA polymerase.
    • The stability of the lambda O initiator protein during stringent control warrants further investigation.