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Related Experiment Videos

The terminase enzyme from bacteriophage lambda: a DNA-packaging machine.

C E Catalano1

  • 1Department of Pharmaceutical Sciences, University of Colorado Health Sciences Center, Denver 80262, USA. carlos.catalano@uchsc.edu

Cellular and Molecular Life Sciences : CMLS
|August 19, 2000
PubMed
Summary

Terminase enzyme complex drives bacteriophage lambda DNA packaging through coordinated ATPase, DNA strand-separation, and nuclease activities. Its assembly and transitions reveal insights into biological molecular machines.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Terminase is a crucial enzyme complex responsible for packaging the bacteriophage lambda genome.
  • This enzyme complex exhibits ATPase, DNA strand-separation, and nuclease activities essential for viral DNA encapsulation.

Purpose of the Study:

  • To review the biochemical, biophysical, and catalytic properties of terminase.
  • To present models for the assembly and interconversion of terminase-nucleoprotein complexes during genome packaging.
  • To discuss the interactions and catalytic modulation within the terminase complex.

Main Methods:

  • Literature review of biochemical and biophysical studies on terminase.
  • Analysis of existing models for nucleoprotein complex assembly.

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  • Discussion of catalytic site interactions and activity modulation.

    • Main Results:

    • Terminase holoenzyme integrates multiple catalytic activities for efficient genome packaging.
    • Stable nucleoprotein intermediates transition into a dynamic DNA packaging machine.
    • Models illustrate the ordered progression and interconversion of these complexes.

    Conclusions:

    • Terminase functions as a biological machine, exemplifying conserved mechanisms in DNA packaging.
    • The study highlights mechanistic similarities between viral DNA packaging and other biological processes like DNA replication and transcription initiation.
    • Understanding terminase provides insights into molecular motors and complex biological machinery.