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DNA Bacteriophages01:26

DNA Bacteriophages

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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, 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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Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
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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 bacterial cell wall is an essential structural component that encases the plasma membrane, preserving cellular integrity, determining shape, and protecting against osmotic stress. This rigid yet flexible structure primarily comprises peptidoglycan, a polymer that forms a mesh-like matrix conferring mechanical strength and flexibility.Peptidoglycan Composition and StructurePeptidoglycan, the core of the bacterial cell wall, comprises alternating units of N-acetylglucosamine (NAG) and...
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Phage-mimicking antibacterial core-shell nanoparticles.

Juliane Hopf1, Margo Waters2, Veronica Kalwajtys3

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Antibiotic resistance is a growing threat. Researchers developed novel phage-mimicking nanoparticles (ANPs) that effectively inhibit and kill resistant bacteria without antibiotics, showing promise for new treatments.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Antimicrobial Research

Background:

  • Rising rates of nosocomial infections due to antibiotic-resistant bacteria necessitate novel therapeutic strategies.
  • Limited discovery of new antibiotic classes exacerbates the challenge of combating resistant pathogens.

Purpose of the Study:

  • To develop an antibiotic-free antibacterial system inspired by bacteriophages.
  • To synthesize and characterize phage-mimicking nanoparticles (ANPs) for combating antibiotic-resistant bacteria.

Main Methods:

  • Synthesized ANPs with a silica core, anisotropic silver-coated gold nanospheres, mimicking bacteriophage structure (up to 88% similarity to *Microviridae*).
  • Evaluated ANP bactericidal efficacy against *Staphylococcus aureus*, *Pseudomonas aeruginosa*, and *Enterococcus faecalis*.
  • Assessed ANP biocompatibility with human skin keratinocytes.

Main Results:

  • ANPs inhibited bacterial growth by 21%–90% and delayed growth by up to 5 hours across tested pathogens.
  • Gram-positive bacteria demonstrated higher sensitivity to ANP treatment.
  • No significant cytotoxic effects were observed in human skin cells.

Conclusions:

  • Phage-mimicking ANPs present a promising, antibiotic-free alternative for combating resistant bacteria.
  • These ANPs show potential for use in treating nosocomial infections and may be suitable for combination therapies.