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Related Experiment Videos

Regulation of replication of lambda phage and lambda plasmid DNAs at low temperature

M Gabig1, M Obuchowski, S Srutkowska

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

Molecular & General Genetics : MGG
|July 21, 1998
PubMed
Summary

Bacteriophage lambda

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Area of Science:

  • Molecular Biology
  • Virology
  • Microbiology

Background:

  • Bacteriophage lambda lysogenic development occurs at low temperatures (20-25°C) in E. coli, but lytic development is blocked.
  • This blockage is attributed to increased stability of the phage CII protein, enhancing pE promoter activity and inhibiting phage DNA replication.

Purpose of the Study:

  • To investigate the effect of temperature on bacteriophage lambda lytic development and DNA replication.
  • To clarify the role of the CII protein in inhibiting phage DNA synthesis at low temperatures.
  • To explore the differential replication of phage lambda and its derived plasmids under these conditions.

Main Methods:

  • Utilized phage lambda cIb2, incapable of lysogenic development, to assess burst size across a temperature range (20-37°C).
  • Employed density-shift experiments to monitor phage DNA replication at 20°C.
  • Investigated the impact of overexpressing the CII protein on phage growth and plasmid replication.

Main Results:

  • Phage lambda cIb2 progeny were absent at 20°C, with burst size increasing with temperature.
  • Phage DNA replication was completely inhibited at 20°C, and this inhibition was confirmed by CII overexpression.
  • Replication of bacteriophage lambda-derived plasmids was unaffected by low temperature or CII overexpression.

Conclusions:

  • The CII protein is confirmed to inhibit bacteriophage lambda DNA replication at low temperatures.
  • A model is proposed to explain the distinct replication behaviors of phage lambda DNA and lambda plasmid DNA at low temperatures.

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