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Related Experiment Videos

Virus DNA packaging: the strategy used by phage lambda

C E Catalano1, D Cue, M Feiss

  • 1School of Pharmacy, University of Colorado Health Science Center, Denver 80262, USA.

Molecular Microbiology
|June 1, 1995
PubMed
Summary
This summary is machine-generated.

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Bacteriophage lambda DNA packaging involves the terminase enzyme recognizing concatemeric DNA, nicking specific sites (cosN), and translocating DNA into the prohead. Accessory sites cosB and cosQ ensure efficient and accurate DNA packaging.

Area of Science:

  • Molecular Biology
  • Virology
  • Genetics

Background:

  • Bacteriophage lambda, like other large DNA viruses, replicates via concatemeric DNA.
  • This concatemeric DNA must be processed into unit-length, virion DNA through specific cutting.
  • DNA processing is tightly coordinated with DNA packaging into the phage prohead.

Purpose of the Study:

  • To elucidate the role of the phage lambda-encoded terminase enzyme in DNA packaging.
  • To understand the function of specific DNA recognition sites (cosB, cosN, cosQ) in the packaging process.
  • To differentiate lambda DNA packaging mechanisms from other DNA transactions within the phage.

Main Methods:

  • Analysis of the phage lambda-encoded terminase enzyme's functions.
  • Investigation of the roles of cosN, cosB, and cosQ sites in DNA recognition and processing.

Related Experiment Videos

  • Characterization of protein-DNA complex formation (complex I and complex II) during packaging initiation.

    • Main Results:

    • Terminase enzyme recognizes concatemeric DNA, nicks cosN to generate cohesive ends, and binds the prohead.
    • cosB site enhances terminase activity at cosN, facilitating prohead binding and forming essential intermediate complexes.
    • cosQ site is crucial for termination, mediating the cutting of the second cosN site after DNA translocation.

    Conclusions:

    • Phage lambda DNA packaging is a complex process orchestrated by the terminase enzyme and specific DNA sites.
    • The interaction between terminase, cosB, and cosN is critical for initiating DNA packaging into the prohead.
    • cosQ plays a distinct role in terminating the packaging process, ensuring accurate unit-length DNA generation.