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Summary
This summary is machine-generated.

Bacteriophage lysis involves holin S105 forming membrane rafts, triggering rapid cell death. This raft formation is crucial for lethal phage infection and may inform viral release and apoptosis research.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biophysics

Background:

  • Bacteriophage lambda (λ) infection leads to rapid cell lysis mediated by the holin protein S105.
  • Holin S105 accumulates in the membrane and triggers pore formation at a specific time, releasing endolysin and causing lysis within seconds.

Purpose of the Study:

  • To investigate the spatiotemporal dynamics of holin S105 during phage λ infection.
  • To elucidate the mechanism of holin-mediated membrane permeabilization and cell lysis.

Main Methods:

  • Utilized a functional S105-green fluorescent protein (GFP) chimera.
  • Employed real-time deconvolution fluorescence microscopy and Fluorescence Recovery After Photobleaching (FRAP).
  • Constructed and analyzed isogenic S105 mutants and antiholin alleles.

Main Results:

  • S105-GFP accumulated uniformly until sudden aggregation into membrane rafts preceding lethal triggering.
  • Nonlethal mutants remained uniformly distributed; early-lysing mutants showed early raft formation.
  • WT rafts were immobile, while nonlethal mutants and untriggered WT were mobile in the membrane.
  • An antiholin S105(ΔTMD1)-mCherryFP fusion blocked lysis and raft formation.

Conclusions:

  • Phage lysis is initiated when holin S105 reaches critical concentration and nucleates to form immobile membrane rafts.
  • This raft formation is essential for lethal hole formation and subsequent cell lysis.
  • The proposed model of holin function may be relevant to nonenveloped virus release and apoptosis in mammalian cells.