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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: Lysogenic Cycle01:16

Viral Replication: Lysogenic Cycle

The lysogenic cycle is a crucial viral replication strategy that allows bacteriophages to persist within host cells without immediately destroying them. This process is primarily observed in temperate phages, such as bacteriophage lambda (λ), which infects Escherichia coli. The cycle allows the viral genome to persist across bacterial generations while keeping host cells viable.Integration of the Viral GenomeUpon infection, bacteriophage lambda attaches to the bacterial surface and injects its...
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 Isolation01:24

DNA Isolation

DNA isolation protocols can be fast and straightforward or complex and time-consuming depending on the type and quality of DNA required for further processing. For example, plasmid DNA extraction is a bit more complicated than genomic DNA extraction because of the need for an appropriate lysis method to separate plasmid DNA from gDNA during isolation. However, for specific applications, such as long-range DNA sequencing that require a good yield of high- quality DNA samples, we need to follow...

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Related Experiment Video

Updated: Jun 3, 2026

Visualizing the Interaction Between the Qdot-labeled Protein and Site-specifically Modified &#955; DNA at the Single Molecule Level
08:56

Visualizing the Interaction Between the Qdot-labeled Protein and Site-specifically Modified λ DNA at the Single Molecule Level

Published on: July 17, 2018

Preparation of phage lambda DNA.

J W Dale1, P J Greenaway

  • 1Department of Microbiology, University of Surrey, Guildford, Surrey.

Methods in Molecular Biology (Clifton, N.J.)
|March 5, 2011
PubMed
Summary
This summary is machine-generated.

This study details two methods for isolating phage DNA. Method A uses phenol extraction for large DNA quantities, while Method B employs SDS lysis and precipitation for smaller, sufficient DNA yields for restriction digests.

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Last Updated: Jun 3, 2026

Visualizing the Interaction Between the Qdot-labeled Protein and Site-specifically Modified &#955; DNA at the Single Molecule Level
08:56

Visualizing the Interaction Between the Qdot-labeled Protein and Site-specifically Modified λ DNA at the Single Molecule Level

Published on: July 17, 2018

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Published on: October 14, 2011

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Published on: September 8, 2021

Area of Science:

  • Molecular Biology
  • Virology
  • Biochemistry

Background:

  • Phage DNA isolation is crucial for molecular biology applications.
  • Different applications require varying amounts and purities of phage DNA.
  • Existing methods like phenol extraction are suitable for large yields.

Purpose of the Study:

  • To describe efficient methods for isolating phage DNA.
  • To provide options for obtaining both large and small quantities of phage DNA.
  • To ensure DNA purity sufficient for downstream applications like restriction digests.

Main Methods:

  • Method A: Phenol extraction for high-purity, large-scale phage DNA isolation.
  • Method B: Plate lysate preparation followed by SDS lysis, potassium acetate precipitation, and ethanol precipitation for small-scale DNA isolation.
  • Comparison of methods based on yield and purity for specific applications.

Main Results:

  • Phenol extraction yields large amounts of high-quality phage DNA suitable for vectors and gel electrophoresis markers.
  • Method B provides sufficient purity of small phage DNA amounts for distinct restriction enzyme digest patterns on agarose gels.
  • Both methods effectively remove phage proteins to yield purified DNA.

Conclusions:

  • Two distinct protocols for phage DNA isolation are presented, catering to different experimental needs.
  • Method A is optimal for applications requiring substantial, high-purity DNA.
  • Method B offers a practical approach for obtaining adequate DNA yields for analyses like restriction digests.