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Related Concept Videos

Lytic Cycle of Bacteriophages01:30

Lytic Cycle of Bacteriophages

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 lytic replication...
DNA Bacteriophages01:26

DNA Bacteriophages

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...
Viral Replication: Lytic Cycle01:20

Viral Replication: Lytic Cycle

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...
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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Introduction to Virus01:28

Introduction to Virus

Viruses are unique biological entities that blur the boundary between living and non-living systems. Although they lack cellular structure and metabolic processes, they can exhibit characteristics of life when infecting a host. Their defining feature is a nucleic acid core, composed of either DNA or RNA, encapsulated within a protein coat called a capsid. This simple structure allows them to invade host cells and use their machinery for replication efficiently.Viral Structure and...
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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Related Experiment Video

Updated: May 25, 2026

Simple and Robust in vivo and in vitro Approach for Studying Virus Assembly
09:47

Simple and Robust in vivo and in vitro Approach for Studying Virus Assembly

Published on: March 1, 2012

Lipid-containing viruses: bacteriophage PRD1 assembly.

Sarah J Butcher1, Violeta Manole, Nelli J Karhu

  • 1Institute of Biotechnology, University of Helsinki, Helsinki, Finland. sarah.butcher@helsinki.fi

Advances in Experimental Medicine and Biology
|February 3, 2012
PubMed
Summary

This chapter details the structure of the PRD1 virus, focusing on its assembly process and the unique genome packaging machinery. It addresses key challenges in understanding viral protein roles and assembly mechanisms.

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Last Updated: May 25, 2026

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Area of Science:

  • Virology
  • Structural Biology
  • Molecular Biology

Background:

  • PRD1 is an icosahedral virus with an internal lipid membrane.
  • It possesses a linear dsDNA genome with protein priming for replication.

Purpose of the Study:

  • To elucidate the roles of PRD1's 37 viral proteins in assembly.
  • To explain the function of the genome packaging machinery.
  • To discuss current challenges in PRD1 assembly.

Main Methods:

  • Structural analysis of PRD1 virions.
  • Biochemical studies of viral protein interactions.
  • Investigation of genome packaging mechanisms.

Main Results:

  • Detailed understanding of PRD1 protein functions in assembly.
  • Insights into the mechanism of genome translocation into the procapsid.
  • Identification of key structural components involved in packaging.

Conclusions:

  • PRD1 assembly is a complex process involving intricate protein-viral DNA interactions.
  • The unique packaging machinery is crucial for viral genome delivery.
  • Further research is needed to fully resolve remaining assembly challenges.