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Method for Measurement of Viral Fusion Kinetics at the Single Particle Level
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Membrane fusion during phage lysis.

Manoj Rajaure1, Joel Berry2, Rohit Kongari1

  • 1Center for Phage Technology, Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843-2128; and.

Proceedings of the National Academy of Sciences of the United States of America
|April 15, 2015
PubMed
Summary
This summary is machine-generated.

Bacteriophage lysis requires outer membrane disruption, not just peptidoglycan degradation. Spanins mediate membrane fusion, a crucial step in releasing new phages, and this process is linked to peptidoglycan breakdown.

Keywords:
endolysinholinmembrane fusionspaninspheroplast

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Virology

Background:

  • Bacteriophage lysis traditionally focused on peptidoglycan degradation for host cell bursting.
  • Recent findings indicate outer membrane disruption is also essential for Gram-negative bacterial lysis by phages.
  • Spanins, phage-encoded proteins, connect the inner and outer membranes but their mechanism of outer membrane disruption was unclear.

Purpose of the Study:

  • To elucidate the mechanism by which phage-encoded spanins disrupt the Gram-negative bacterial outer membrane.
  • To investigate the role of spanins in the final stages of bacteriophage-mediated cell lysis.
  • To understand how spanin function is coordinated with other lysis components like endolysins and holins.

Main Methods:

  • Investigated the function of spanins from the coliphage lambda.
  • Utilized membrane fusion assays to assess spanin activity.
  • Examined the interplay between spanin-mediated fusion and peptidoglycan degradation.

Main Results:

  • Demonstrated that lambda phage spanins mediate efficient fusion between the inner and outer bacterial membranes.
  • Provided evidence that spanin-mediated membrane fusion is regulated by the peptidoglycan meshwork.
  • Showed that spanin function is coupled to phage endolysin activity, which degrades peptidoglycan.

Conclusions:

  • The final step of bacteriophage lysis involves the fusion of the inner and outer membranes, mediated by spanins.
  • Spanin-mediated fusion is dynamically regulated by the integrity of the peptidoglycan layer.
  • The lysis pathway involves coordinated action of holins, endolysins, and spanins, leading to significant membrane and cell wall disruption.