Related Experiment Video

Updated: May 16, 2026

Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins
09:40

Phage Phenomics: Physiological Approaches to Characterize Novel Viral Proteins

Published on: June 11, 2015

The Mu story: how a maverick phage moved the field forward

Rasika M Harshey1

  • 1Section of Molecular Genetics and Microbiology and Institute of Cellular and Molecular Biology, University of Texas at Austin, Austin, TX, 78712, USA. rasika@uts.cc.utexas.edu.

Mobile DNA
|December 11, 2012
PubMed

Insights

Phage Mu revolutionized understanding of transposable elements, providing key insights into DNA transposition mechanisms and genome dynamics. Its study paved the way for analyzing other elements and developing antiviral therapies.

Area of Science:

  • Molecular Biology
  • Genetics
  • Virology

Background:

  • Transposable elements, or "jumping genes," are DNA sequences capable of changing their position within a genome.
  • Barbara McClintock first postulated their existence in maize, but molecular mechanisms remained elusive until the study of bacterial insertion sequences.
  • Bacteriophage Mu has been instrumental in elucidating these mechanisms.

Purpose of the Study:

  • To highlight the pivotal role of bacteriophage Mu in advancing the understanding of DNA transposition.
  • To detail how Mu-based models provided a framework for studying diverse transposable elements.
  • To connect Mu research to the development of antiviral drugs targeting similar integration mechanisms.

Main Methods:

  • Early molecular studies on bacteriophage Mu in *E. coli*.
  • Development of the first *in vitro* transposition system using Mu.
  • Biochemical analysis of Mu's phosphoryl transfer reaction and nucleoprotein complexes.

Main Results:

  • Mu provided the first molecular evidence for insertion elements in *E. coli*.
  • A Mu-based model explained DNA rearrangements during transposition.
  • The *in vitro* system revealed the chemistry of transposition and associated complexes.
  • Mu's mechanism informed the study of HIV DNA integration and drug development.

Conclusions:

  • Bacteriophage Mu has been a foundational tool for understanding transposable element biology.
  • Research on Mu has direct implications for human health, particularly in antiviral drug discovery.
  • Mu's contributions extend to a broader understanding of genome structure and dynamics.

More Related Videos

Precise Phage Mutagenesis with NgTET-Assisted CRISPR-Cas Systems10:52

Precise Phage Mutagenesis with NgTET-Assisted CRISPR-Cas Systems

Published on: October 14, 2025

Following Cell-fate in E. coli After Infection by Phage Lambda06:10

Following Cell-fate in E. coli After Infection by Phage Lambda

Published on: October 14, 2011

Related Concept Videos

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...
Bacterial Transformation01:33

Bacterial Transformation

In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
Bacterial Transformation01:33

Bacterial Transformation

In 1928, bacteriologist Frederick Griffith worked on a vaccine for pneumonia, which is caused by Streptococcus pneumoniae bacteria. Griffith studied two pneumonia strains in mice: one pathogenic and one non-pathogenic. Only the pathogenic strain killed host mice.
Griffith made an unexpected discovery when he killed the pathogenic strain and mixed its remains with the live, non-pathogenic strain. Not only did the mixture kill host mice, but it also contained living pathogenic bacteria that...
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...
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...
Lysogenic Cycle of Bacteriophages00:43

Lysogenic Cycle of Bacteriophages

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...