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Related Concept Videos

Lysogenic Cycle of Bacteriophages00:43

Lysogenic Cycle of Bacteriophages

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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...
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Lytic Cycle of Bacteriophages01:30

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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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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
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CRISPR and crRNAs02:53

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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
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Complement System

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
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Updated: Jun 12, 2025

Following Cell-fate in E. coli After Infection by Phage Lambda
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The great phage escape: Activating and escaping lactococcal antiphage systems.

Cas Mosterd1, Andriana Grafakou1, Guillermo Ortiz Charneco1

  • 1School of Microbiology and Alimentary Pharmabiotics Centre (APC) Microbiome Ireland, University College Cork, Cork T12 YT20, Ireland.

Proceedings of the National Academy of Sciences of the United States of America
|June 11, 2025
PubMed
Summary

Researchers investigated bacterial defense systems against phages, discovering new mechanisms and mutated genes in phage escape mutants. This enhances understanding of phage-host interactions for various applications.

Keywords:
Lactococcusactivationescape mutantslactic acid bacteriaphage defense

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Area of Science:

  • Microbiology
  • Bacteriology
  • Molecular Biology

Background:

  • Bacteria possess diverse systems to defend against bacteriophages (phages).
  • Understanding these antiphage mechanisms is crucial for controlling phage infections and for biotechnology.

Purpose of the Study:

  • To elucidate the mechanisms of 13 plasmid-encoded lactococcal antiphage systems.
  • To identify genes and proteins involved in phage resistance and escape.

Main Methods:

  • Isolation and genome analysis of 66 phage escape mutants.
  • Comparative analysis of mutated genes and protein functions.
  • Experimental validation using purified phage endolysin.

Main Results:

  • 15 mutated genes were identified in phage escape mutants.
  • Six proteins were found to activate specific antiphage systems.
  • Mechanistic commonalities and differences were observed among various antiphage systems, including Audmula's novel cell wall modification mechanism.

Conclusions:

  • The study provides mechanistic insights into bacterial antiphage systems.
  • Findings advance the understanding of phage-host interactions.
  • Results have potential benefits for the dairy industry, biotechnology, and biomedical applications.