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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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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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Anionic Synthetic Polymers Prevent Bacteriophage Infection.

Huba L Marton1, Peter Kilbride2, Ashfaq Ahmad3

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Poly(acrylic acid) effectively prevents bacteriophage (phage) contamination in bioprocessing by inhibiting phage replication and host killing. This simple additive maintains recombinant protein expression, offering a scalable solution for industrial biotechnology.

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Area of Science:

  • Biotechnology and Bioprocessing
  • Microbial Contamination Control

Background:

  • Bacteriophage (phage) contamination is a significant challenge in bioprocessing, leading to product loss and operational shutdowns.
  • Current decontamination methods often rely on nonspecific disinfectants, which can be harsh and inefficient.
  • There is a need for effective, scalable solutions to prevent phage contamination in industrial microbial production.

Purpose of the Study:

  • To investigate the efficacy of poly(acrylic acid) as a preventative agent against bacteriophage contamination in bacterial hosts.
  • To assess the impact of poly(acrylic acid) on phage replication and bacterial host viability.
  • To evaluate the effect of poly(acrylic acid) on recombinant protein expression during bioprocessing.

Main Methods:

  • Bacterial cultures were exposed to bacteriophages in the presence of poly(acrylic acid) and control polymers (poly(methacrylic acid), poly(styrenesulfonate)).
  • Bacterial host killing and phage replication were monitored.
  • Recombinant protein expression levels were measured in the presence of poly(acrylic acid).

Main Results:

  • Poly(acrylic acid) effectively prevented phage-induced killing of bacterial hosts and inhibited phage replication.
  • Poly(acrylic acid) demonstrated higher activity compared to poly(methacrylic acid), with poly(styrenesulfonate) showing no activity, highlighting the importance of carboxylic acid groups.
  • Recombinant protein expression was not negatively affected by the presence of poly(acrylic acid).

Conclusions:

  • Poly(acrylic acid) is a potent virustatic agent against bacteriophage contamination in bioprocessing.
  • This polymer offers a simple, low-cost, and scalable solution for preventing phage contamination without compromising product yield.
  • The findings suggest poly(acrylic acid) can be readily implemented in industrial bioprocessing to enhance product security and reduce operational disruptions.