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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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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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The phylum Tenericutes, which includes the single class Mollicutes, comprises bacteria that lack cell walls. The term "Mollicutes" derives from the Latin word mollis, meaning "soft." These organisms are among the smallest known and are commonly referred to as mycoplasmas due to the prominence of the genus Mycoplasma, which includes well-known human pathogens. Despite their inability to stain gram-positively (a result of their lack of cell walls), mycoplasmas are phylogenetically related to the...
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Bacterial Phylum Bacteroidota01:26

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The phylum Bacteroidota includes over 700 species classified into four primary orders: Bacteroidales, Cytophagales, Flavobacteriales, and Sphingobacteriales. These gram-negative, non-sporulating rods exhibit saccharolytic capabilities and can be aerobic or fermentative, encompassing obligate aerobes, facultative aerobes, and obligate anaerobes. Many species display gliding motility, though some are nonmotile or use flagella. The genus Bacteroides is well-studied due to its significant role in...
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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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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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[Classification of tailed enterobacteria phages]

H W Ackermann

    Pathologie-Biologie
    |May 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    This study classifies 250 enterobacteria tailed phages into seven groups based on morphology and genetics. It proposes type species and discusses phage evolution and taxonomic criteria for better classification.

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    Area of Science:

    • Microbiology
    • Virology
    • Bacteriology

    Context:

    • Enterobacteria are a significant group of bacteria, and understanding their associated viruses (phages) is crucial for controlling bacterial infections and for biotechnological applications.
    • The classification of bacteriophages has historically relied on diverse methods, leading to inconsistencies and challenges in establishing a unified taxonomy.

    Purpose:

    • To establish a comprehensive classification system for tailed enterobacteria phages.
    • To define type species for proposed phage groups.
    • To evaluate the reliability of existing data and taxonomic criteria for phage classification.

    Summary:

    • This research details the classification of 250 tailed bacteriophages infecting enterobacteria, utilizing morphological, serological, and physico-chemical properties of the virion and its nucleic acid.
    • The study describes 24 distinct species organized into seven major morphological groups, proposing type species for each.
    • Approximately 120 poorly characterized phages remain unclassified, and the authors discuss phage evolution and the validity of current taxonomic approaches.

    Impact:

    • Provides a structured framework for understanding bacteriophage diversity within enterobacteria.
    • Facilitates further research into phage biology, evolution, and potential applications in areas like phage therapy.
    • Highlights the need for standardized taxonomic methods in virology.