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Related Concept Videos

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Lytic Cycle of Bacteriophages

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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...
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Enzymes02:34

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Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
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Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
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Viral Replication: Lytic Cycle01:20

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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...
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Enzyme-linked receptors are proteins that act as both receptor and enzyme, activating multiple intracellular signals. This is a large group of receptors that include the receptor tyrosine kinase (RTK) family. Many growth factors and hormones bind to and activate the RTKs.
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Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure.
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Related Experiment Video

Updated: Jan 30, 2026

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

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Phage Lytic Enzymes.

Yves Briers1

  • 1Department of Biotechnology, Ghent University, 9000 Ghent, Belgium. yves.briers@ugent.be.

Viruses
|February 1, 2019
PubMed
Summary

Phage lytic enzymes aid bacterial infection by degrading peptidoglycan. These viral enzymes also cause cell lysis, releasing new viruses at the end of their replication cycle.

Area of Science:

  • Microbiology
  • Virology
  • Biochemistry

Background:

  • Phage lytic enzymes are produced by bacterial viruses (bacteriophages).
  • These enzymes play crucial roles in the bacteriophage life cycle, specifically during infection and replication.
  • Their functions include degrading the bacterial cell wall to facilitate entry and release.

Discussion:

  • The study focuses on the dual role of phage lytic enzymes in bacterial infection.
  • Emphasis is placed on their function in both initial infection and the final stages of viral replication.
  • Understanding these enzymes is key to comprehending bacteriophage-host interactions.

Key Insights:

  • Phage lytic enzymes are essential for bacteriophage propagation.
  • They mediate bacterial cell envelope breakdown for viral entry and egress.

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  • Local peptidoglycan degradation is critical for successful infection and lysis.

    • Outlook:

    • Further research into phage lytic enzymes could lead to novel antimicrobial strategies.
    • Exploring their mechanisms may offer insights into targeted bacterial cell disruption.
    • Potential applications in phage therapy and biotechnology are significant.