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Elements in the λ immunity region regulate phage development: beyond the 'Genetic Switch'.

Lynn C Thomason1, Kathleen Morrill2, Gillian Murray2

  • 1Basic Science Program, Frederick National Laboratory for Cancer Research, Frederick, MD, 21702, USA.

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Bacteriophage lambda's genetic elements, including the PLIT promoter and TIMM terminator, control its life cycle. RexA and RexB proteins are crucial for switching from lysogeny to lytic growth, impacting phage yield.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • Bacteriophage lambda (λ) maintains lysogeny or undergoes lytic growth via a genetic switch regulated by CI and Cro repressors.
  • The λ immunity region contains less-studied elements like the PLIT promoter and TIMM terminator, which influence prophage maintenance and induction.
  • LexA repressor regulates PLIT, coordinating its activation with lytic promoters during the SOS response.

Purpose of the Study:

  • To investigate the roles of the PLIT promoter and TIMM terminator in bacteriophage λ's life cycle.
  • To understand the function of RexA and RexB proteins in the switch between lysogenic and lytic growth.
  • To characterize the interaction and regulation of these genetic elements.

Main Methods:

  • Bacterial two-hybrid system to study RexA and RexB protein interactions.
  • Analysis of mutations in PLIT and TIMM to assess their impact on phage biology.
  • Gene expression analysis to determine promoter activity and protein levels.

Main Results:

  • The PLIT promoter is repressed by bacterial LexA, ensuring synchronous activation with lytic promoters during DNA damage.
  • RexA and RexB proteins interact and are critical for the lysogeny-to-lytic switch; mutations in PLIT disrupt RexA/RexB balance, reducing phage yield.
  • TIMM functions as a Rho-independent terminator with minimal impact on lysogenization or induction.

Conclusions:

  • The PLIT promoter and RexA/RexB proteins play significant roles in regulating bacteriophage λ's lytic pathway and overall yield.
  • TIMM appears to be a functional terminator but has a limited role in key λ life cycle events.
  • Understanding these regulatory elements provides insight into bacteriophage-host interactions and genetic switch mechanisms.