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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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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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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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Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
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Author Spotlight: Efficiently Eliminating Bacteriophages from Infected Salmonella Cultures Using Lipopolysaccharides
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Bacteriophage Receptor Recognition and Nucleic Acid Transfer.

Mark J van Raaij1

  • 1Department of Macromolecular Structure, Centro Nacional de Biotecnología (CNB-CSIC), Madrid, Spain. mjvanraaij@cnb.csic.es.

Sub-Cellular Biochemistry
|December 31, 2024
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Summary
This summary is machine-generated.

Bacteriophages use specific proteins on their capsid or appendages for recognizing and binding to host bacterial cells. This recognition event is crucial for initiating viral infection and subsequent nucleic acid injection.

Keywords:
AdsorptionAttachmentBacteriophageBacteriumBaseplateCapsidCell wallContractile tailFlagellumGram-negativeGram-positiveLipopolysaccharideMembraneNucleic acid conduitPeptidoglycanPilusReceptorTail fibreTailspikeTeichoic acid

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Area of Science:

  • Microbiology
  • Virology
  • Molecular Biology

Background:

  • Host cell recognition is a critical initial step in the viral replication cycle.
  • Bacteriophages must accurately identify their target bacterium before genome transfer.

Purpose of the Study:

  • To elucidate the mechanisms and proteins bacteriophages employ for host cell recognition.
  • To describe the process of nucleic acid injection following receptor recognition.

Main Methods:

  • Review of existing literature on bacteriophage-host interactions.
  • Analysis of protein structures and functions involved in recognition and injection.

Main Results:

  • Bacteriophages utilize capsid proteins, spikes, or fibers for host cell recognition.
  • Recognition involves multiple identical binding events, signaling genome transfer commitment.
  • Capsid remains external, while specialized proteins may accompany DNA for injection and early gene expression.

Conclusions:

  • Bacteriophage host recognition is a precise mechanism preceding genome injection.
  • Specialized proteins play roles in DNA translocation, protection, and early viral gene expression post-injection.