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Related Concept Videos

Bacteriophages of the Human Virome01:23

Bacteriophages of the Human Virome

Bacteriophages are found throughout the human body. They may even outnumber eukaryotic viruses, forming an important and dynamic component of the human virome. Indeed, phages represent the most abundant viral entities, with densities in the gut reaching up to 10⁹ particles per gram of fecal matter, and many belonging to orders such as Caudovirales and Microviridae, while a substantial proportion remains unclassified as viral “dark matter.”Lysogeny and Genetic ExchangeIn the gut, bacteriophages...
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...
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...
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...
Immune Surveillance by NK Cells and Phagocytes01:25

Immune Surveillance by NK Cells and Phagocytes

Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
Natural Killer Cells: The Fast Responders
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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...

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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

Phages in nature.

Martha Rj Clokie1, Andrew D Millard, Andrey V Letarov

  • 1Department of Infection, Immunity and Inflammation; Medical Sciences Building; University of Leicester; Leicester, UK.

Bacteriophage
|June 21, 2011
PubMed
Summary
This summary is machine-generated.

Bacteriophages (phages), viruses infecting bacteria and archaea, are crucial for understanding microbial systems. Research highlights their roles in evolution, gene transfer, and as therapeutic agents, with integrated methods offering new insights.

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Area of Science:

  • Microbiology
  • Virology
  • Molecular Biology

Background:

  • Bacteriophages (phages) are the most abundant biological entities, infecting bacteria and archaea.
  • Phages are vital for microbial evolution, horizontal gene transfer, and molecular biology research.
  • Understanding phage-host interactions is key to deciphering microbial ecosystems.

Purpose of the Study:

  • To describe the diverse roles of phages in various host systems.
  • To illustrate how integrated research approaches provide deep insights into phage biology.
  • To highlight the significance of phages as tools and therapeutic agents.

Main Methods:

  • Utilizing modeling and microscopy for visualizing phage-host interactions.
  • Employing isolation techniques for phage characterization.
  • Applying genomic and metagenomic approaches for comprehensive analysis.

Main Results:

  • Phages play significant roles in fundamental molecular biology.
  • They act as vectors for horizontal gene transfer, driving bacterial evolution.
  • Integrated methods offer unparalleled insights into phage biology and host interactions.

Conclusions:

  • Phages are essential components of microbial ecosystems with diverse applications.
  • Unraveling phage biology is critical for understanding and exploiting microbial systems.
  • Combined research methodologies enhance our comprehension of these vital organisms.