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Viral Replication: Lysogenic Cycle01:16

Viral Replication: Lysogenic Cycle

The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects its...
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Understanding the Impact of Temperate Bacteriophages on Their Lysogens Through Transcriptomics
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Comparative analyses of prophage-like elements present in two Lactococcus lactis strains.

Marco Ventura1, Aldert Zomer, Carlos Canchaya

  • 1Alimentary Pharmabiotic Centre and Department of Microbiology, Bioscience Institute, National University of Ireland, Western Road, Cork, Ireland.

Applied and Environmental Microbiology
|October 16, 2007
PubMed
Summary

Researchers identified 11 prophage-like elements in Lactococcus lactis genomes. Phylogenetic and bioinformatic analyses confirmed these elements belong to the lactococcal P335 group of temperate bacteriophages.

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Area of Science:

  • Microbiology
  • Virology
  • Genomics

Background:

  • Lactococcus lactis is a key dairy starter culture.
  • Bacteriophages can impact bacterial fermentation processes.
  • Understanding prophage elements in L. lactis is crucial for strain stability.

Purpose of the Study:

  • To characterize the genetic organization of prophage-like elements in Lactococcus lactis subsp. cremoris strains.
  • To determine the phylogenetic relationships of these elements within known bacteriophage groups.

Main Methods:

  • Genome sequencing and analysis of L. lactis subsp. cremoris MG1363 and SK11.
  • Bioinformatic tools for prophage identification and characterization.
  • Phylogenetic analysis of identified prophage sequences.

Main Results:

  • Six and five apparent prophage-like elements were identified in strains MG1363 and SK11, respectively.
  • All 11 identified prophages were phylogenetically classified.
  • The prophages belong to subdivisions of the lactococcal P335 group.

Conclusions:

  • The study provides detailed genetic insights into prophage populations in L. lactis.
  • The findings confirm the presence and classification of P335 group phages in these strains.
  • This research contributes to the understanding of phage-host interactions in dairy bacteria.