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Related Concept Videos

DNA Bacteriophages01:26

DNA Bacteriophages

Bacteriophages, or phages, are viruses that specifically infect bacteria, utilizing their genetic material to hijack host cellular machinery for replication. DNA bacteriophages employ single-stranded DNA (ssDNA) or double-stranded DNA (dsDNA) genomes. These phages exhibit diverse replication strategies and host interactions, influencing their ecological roles and applications in biotechnology and medicine.ssDNA BacteriophagesssDNA phages, with their small genomes, utilize unique strategies to...
Lytic Cycle of Bacteriophages01:30

Lytic Cycle of Bacteriophages

Bacteriophages, also known as phages, are specialized viruses that infect bacteria. A key characteristic of phages is their distinctive “head-tail” morphology. A phage begins the infection process (i.e., lytic cycle) by attaching to the outside of a bacterial cell. Attachment is accomplished via proteins in the phage tail that bind to specific receptor proteins on the outer surface of the bacterium. The tail injects the phage’s DNA genome into the bacterial cytoplasm. In the lytic replication...
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...
Lysogenic Cycle of Bacteriophages00:43

Lysogenic Cycle of Bacteriophages

In contrast to the lytic cycle, phages infecting bacteria via the lysogenic cycle do not immediately kill their host cell. Instead, they combine their genome with the host genome, allowing the bacteria to replicate the phage DNA along with the bacterial genome. The incorporated copy of the phage genome is called the prophage. Some prophages can re-activate and enter the lytic cycle. This often occurs in response to a perturbation, such as DNA damage, but can also transpire in the absence of...
Viral Replication: Lytic Cycle01:20

Viral Replication: Lytic Cycle

Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
Microbial Interactions: Parasitism01:22

Microbial Interactions: Parasitism

Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...

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Related Experiment Video

Updated: May 10, 2026

T4 Bacteriophage and E. coli Interaction in the Murine Intestine: A Prototypical Model for Studying Host-Bacteriophage Dynamics In Vivo
08:46

T4 Bacteriophage and E. coli Interaction in the Murine Intestine: A Prototypical Model for Studying Host-Bacteriophage Dynamics In Vivo

Published on: January 26, 2024

Bacteriophage-host interaction: from splendid isolation into a messy reality.

Harald Brüssow1

  • 1Nestle Research Centre, BioAnalytical Science Department, Food and Health Microbiology, CH-1000 Lausanne 26, Vers-chez-les-Blanc, Switzerland. harald.bruessow@rdls.nestle.com

Current Opinion in Microbiology
|June 4, 2013
PubMed
Summary

T-type coliphage research, foundational to molecular biology, is being revitalized by systems biology for studying gut microbiome interactions. This offers new potential for phage therapy against antibiotic-resistant biofilms.

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Last Updated: May 10, 2026

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Area of Science:

  • Molecular Biology
  • Microbiology
  • Systems Biology

Background:

  • T-type coliphage research was pivotal in establishing molecular biology.
  • Advances in systems biology enable studying phage-Escherichia coli interactions in natural gut environments.

Purpose of the Study:

  • To explore the potential of T-type coliphages as antimicrobial agents in the context of modern systems biology.
  • To investigate the application of phage therapy against bacterial biofilms, particularly in medical settings.

Main Methods:

  • Utilizing systems biology approaches to study T-type phage-Escherichia coli interactions within the host gut niche.
  • Investigating the depolymerase activity of phages against the polysaccharide matrix of bacterial biofilms.

Main Results:

  • Phage-Escherichia coli interactions can now be studied in vivo within the gut ecosystem.
  • Phages possess depolymerases effective against the biofilm matrix, a challenge for antibiotics.

Conclusions:

  • T-type coliphages, studied via systems biology, present a promising avenue for phage therapy.
  • Phage therapy, leveraging depolymerase activity, could be effective against biofilm-related infections and catheter contamination.