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Tailed double-stranded DNA bacteriophages use a terminase motor for genome packaging, a mechanism similar to herpesviruses. Understanding these DNA packaging motors offers potential for new antiviral therapies targeting viral DNA packaging.

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Area of Science:

  • Structural biology
  • Virology
  • Biochemistry

Background:

  • Tailed double-stranded DNA bacteriophages and herpesviruses share a conserved DNA packaging system involving terminase motors.
  • Terminase motors are crucial for viral genome packaging into protein shells and represent potential antiviral targets.
  • Letermovir, an antiviral drug, targets Cytomegalovirus terminase, demonstrating the therapeutic potential of this approach.

Purpose of the Study:

  • To elucidate the structure and function of the bacteriophage DNA packaging motor.
  • To provide insights into the mechanism of viral DNA packaging.
  • To explore the potential of targeting viral DNA packaging motors for antiviral drug development.

Main Methods:

  • High-resolution structural analysis of individual terminase motor components (portal protein, small terminase, large terminase).
  • Cryo-electron microscopy (cryo-EM) reconstructions of protein complexes involved in DNA packaging.
  • Single-particle studies to analyze packaging kinetics and dynamics.

Main Results:

  • Resolved high-resolution structures of individual bacteriophage terminase motor components.
  • Obtained cryo-EM reconstructions of protein complexes, offering insights into assembly and function.
  • Characterized packaging kinetics, contributing to mechanistic models of DNA translocation.
  • Identified conserved features between bacteriophage and herpesvirus DNA packaging systems.

Conclusions:

  • The bacteriophage DNA packaging motor, comprising portal, small, and large terminase proteins, is structurally and mechanistically conserved with eukaryotic dsDNA viruses like herpesviruses.
  • Recent structural and kinetic studies are enabling the development of detailed models for viral DNA packaging.
  • These findings highlight viral DNA packaging motors as promising targets for novel antiviral therapies.