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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...
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...
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...
Regulation of Bacterial Virulence01:28

Regulation of Bacterial Virulence

Pathogenic bacteria employ a range of regulatory mechanisms to modulate the expression of virulence genes in response to environmental and host-derived signals. These mechanisms ensure that virulence factors are expressed only under favorable conditions, thereby optimizing infection and survival strategies.Mechanisms of Virulence RegulationKey regulatory strategies include:Two-Component Systems: These consist of a membrane-bound sensor kinase and a cytoplasmic response regulator. Environmental...

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Related Experiment Video

Updated: May 13, 2026

Bacteriophage Removal from Infected Salmonella Cultures
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Bacteriophage Removal from Infected Salmonella Cultures

Published on: June 28, 2024

Understanding bacteriophage specificity in natural microbial communities.

Britt Koskella1, Sean Meaden

  • 1BioSciences, University of Exeter, Cornwall Campus, Tremough, TR10 9EZ, UK. B.L.Koskella@Exeter.ac.uk

Viruses
|March 13, 2013
PubMed
Summary

Understanding bacteria-phage interactions is key to microbial diversity and ecosystem health. Research highlights phage specificity

Area of Science:

  • Microbiology
  • Ecology
  • Evolutionary Biology

Background:

  • Bacteria and bacteriophage (phage) coevolution are crucial for microbial diversity and ecosystem function.
  • Phages significantly influence bacterial population dynamics, competition, and community stability.
  • Understanding bacteria-phage interaction networks is vital for predicting community dynamics.

Purpose of the Study:

  • To review progress in understanding phage specificity and experimental evolution.
  • To introduce a new dataset of natural bacteriophages from horse chestnut phyllosphere.
  • To emphasize the importance of considering variation in bacterial phage sensitivity.

Main Methods:

  • Review of experimental evolution studies on phage specificity.
  • Collection and analysis of natural bacteriophage data.

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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

Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins
09:40

Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins

Published on: June 11, 2015

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Last Updated: May 13, 2026

Bacteriophage Removal from Infected Salmonella Cultures
07:19

Bacteriophage Removal from Infected Salmonella Cultures

Published on: June 28, 2024

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

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Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins
09:40

Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins

Published on: June 11, 2015

  • Highlighting the non-binary nature of bacterial phage sensitivity.

    • Main Results:

    • Phage specificity and its role in bacterial communities are complex.
    • Bacterial sensitivity to phages is a spectrum, not a binary trait.
    • Current evidence is insufficient for broad generalizations on phage host range and adaptation.

    Conclusions:

    • Further research combining experimental, genomic, and natural community studies is needed.
    • New insights into phage specificity evolution require integrated approaches.
    • Understanding phage specificity is essential for predicting microbial community structure and function.