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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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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...
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Lysogenic Cycle of Bacteriophages00:43

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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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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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Viral Replication: Lysogenic Cycle01:16

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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...
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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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Bacteriophages and its applications: an overview.

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Area of Science:

  • Microbiology
  • Virology
  • Biotechnology

Background:

  • Bacteriophages (phages) are ubiquitous viruses with antibacterial properties.
  • Phages replicate within bacteria via lytic or lysogenic cycles.
  • Their historical use in combating pathogens is gaining renewed interest due to antibiotic resistance.

Purpose of the Study:

  • To review updated bacteriophage taxonomy and biology.
  • To explore recent applications of phages in various fields.
  • To discuss limitations and concerns regarding phage-based solutions.

Main Methods:

  • Literature review of updated bacteriophage taxonomy (ICTV 2015 Release and revisions).
  • Analysis of phage biology, including replication mechanisms.
  • Synthesis of recent research on phage applications across diverse sectors.

Main Results:

  • Phages are taxonomically classified and exhibit diverse biological characteristics.
  • Phage applications are expanding in biotechnology, medicine, food preservation, aquaculture, and environmental remediation.
  • Concerns and limitations associated with phage-based remedies are identified.

Conclusions:

  • Bacteriophages represent a promising avenue for addressing challenges posed by antibiotic resistance.
  • Further research into phage biology and applications is crucial for overcoming current limitations.
  • Phage-based strategies offer sustainable solutions for various industrial and environmental issues.