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Lysogenic Cycle of Bacteriophages00:43

Lysogenic Cycle of Bacteriophages

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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, 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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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Updated: Feb 13, 2026

Following Cell-fate in E. coli After Infection by Phage Lambda
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Bacteriophage lambda: The path from biology to theranostic agent.

Carlos E Catalano1

  • 1Department of Pharmaceutical Chemistry, Skaggs School of Pharmacy and Pharmaceutical Science, University of Colorado, Aurora, Colorado.

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|March 15, 2018
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Viral nanoparticles offer a versatile platform for creating therapeutic nanoparticles. Bacteriophage lambda

Keywords:
bacteriophage lambdadesigner nanoparticlesphage nanoparticlestheranostic nanoparticles

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Area of Science:

  • * Biology-Inspired Nanomaterials
  • * Protein and Virus-Based Structures
  • * Nucleic Acid-Based Structures

Background:

  • * Viral particles are adaptable platforms for engineering semisynthetic therapeutic nanoparticles.
  • * Genetic and chemical modifications allow control over surface characteristics, targeting, pharmacokinetics, and antigenicity.
  • * Fundamental studies in virus biology provide mechanistic insights into assembly pathways.

Purpose of the Study:

  • * To review the biology of bacteriophage lambda as a nanoparticle platform.
  • * To discuss tools for recapitulating lambda assembly reactions in vitro.
  • * To explore the co-option of the lambda system for nanoparticle design.

Main Methods:

  • * Review of fundamental genetic, biochemical, and structural studies of virus biology.
  • * Discussion of in vitro methods for lambda assembly.
  • * Analysis of observations leading to lambda system co-option for nanoparticle design.

Main Results:

  • * Bacteriophages, particularly lambda, offer significant advantages for nanoparticle platforms.
  • * The lambda system has been adapted for the design of "designer" nanoparticles for theranostic applications.
  • * A fundamental understanding of virus assembly enables rational design of semisynthetic nanoparticles.

Conclusions:

  • * The lambda system exemplifies how virus assembly knowledge facilitates the rational design of semisynthetic nanoparticles.
  • * This approach supports the translation of fundamental research into potential theranostic agents.
  • * Demonstrates the benchtop to bedside translational research concept.