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Related Experiment Videos

Blocking the T4 lysis inhibition phenotype.

Roderick A Slavcev1, Sidney Hayes

  • 1Department of Microbiology and Immunology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E5.

Gene
|November 26, 2003
PubMed
Summary

Bacteriophage T4 infection of Escherichia coli K cells causes lysis inhibition (LIN). RexB protein expression prevents LIN, but its activity is blocked by RexA, revealing new insights into phage-host interactions.

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Area of Science:

  • Bacteriology
  • Molecular Biology
  • Virology

Background:

  • Nonlysogenic Escherichia coli K cells display lysis inhibition (LIN) upon infection by T4rII phage.
  • LIN is a delay in cell lysis, a critical step in the bacteriophage lytic cycle.

Purpose of the Study:

  • To investigate the role of lambda rexB in lysis inhibition.
  • To identify cellular factors that regulate or are affected by LIN.
  • To elucidate the interaction between RexA and RexB proteins in controlling phage infection outcomes.

Main Methods:

  • Expression of lambda rexB in Escherichia coli K cells via prophage or multicopy plasmids.
  • Generation of null mutations in Escherichia coli genes tsp and ssrA.
  • Analysis of cellular phenotypes associated with rexB expression, including cell morphology and suppression of phage lysis mutations.
  • Assessment of the impact of RexA on RexB activity.

Main Results:

  • Expression of lambda rexB in E. coli K cells supported T4rII infection and prevented LIN.
  • Null mutations in tsp or ssrA genes completely blocked LIN establishment.
  • RexB expression (without RexA) caused aberrant cell morphology, suppressed lambda S and T4t holin mutations, and led to cell lysis under specific conditions.
  • RexA expression impeded the activities of RexB.

Conclusions:

  • Lambda rexB plays a significant role in preventing lysis inhibition during T4 phage infection.
  • Cellular factors, including the tail-specific protease (TSP) and 10Sa RNA (ssrA), are essential for the establishment of LIN.
  • RexB exhibits complex regulatory functions, potentially acting as a lysis determinant, with its activity modulated by RexA.

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