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Related Concept Videos

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...
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...
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...
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...
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: Jul 10, 2026

Following Cell-fate in E. coli After Infection by Phage Lambda
06:10

Following Cell-fate in E. coli After Infection by Phage Lambda

Published on: October 14, 2011

Interactions between the vegetative states of phages lambda and T1.

J M Geiman, J R Christensen, H Drexler

    Journal of Virology
    |December 1, 1974
    PubMed
    Summary

    Bacteriophages lambda and T1 coinfection in bacteria revealed that about 10% of cells produced both phages. Little phenotypic mixing was observed, but lambda could complement T1 gene 4.

    Area of Science:

    • Bacteriophage biology
    • Microbial genetics
    • Molecular virology

    Background:

    • Bacteriophages are viruses that infect bacteria.
    • Phage lambda and phage T1 are well-characterized bacteriophages.
    • Understanding phage-bacterial interactions is crucial for various applications.

    Purpose of the Study:

    • To investigate the outcome of coinfection with bacteriophages lambda and T1 in bacterial hosts.
    • To determine the extent of phenotypic mixing during coinfection.
    • To explore genetic interactions between lambda and T1.

    Main Methods:

    • Induction of lambda lysogens and infection of sensitive cells with lambda.
    • Superinfection of lambda-containing bacteria with T1.
    • Assaying for the production of lambda, T1, or both.

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    Following Cell-fate in E. coli After Infection by Phage Lambda
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  • Analysis of progeny phage for phenotypic mixing.
  • Testing T1 amber mutants for complementation by lambda.

    • Main Results:

    • Approximately 10% of infectious centers were dual yielders, producing both lambda and T1.
    • Little to no phenotypic mixing was detected in progeny phage.
    • T1 mutants in various genes did not show defects in excluding lambda.
    • Lambda was found to complement a gene (gene 4) in T1.

    Conclusions:

    • Coinfection of bacteria with lambda and T1 can lead to the production of both phages.
    • Phenotypic mixing between lambda and T1 is limited.
    • There is a genetic interaction where lambda can complement T1 gene 4, suggesting functional overlap or dependence.