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Structure and assembly of bacteriophage PRD1, and Escherichia coli virus with a membrane

J Caldentey1, J K Bamford, D H Bamford

  • 1University of Helsinki, Department of Genetics, Finland.

Journal of Structural Biology
|July 1, 1990
PubMed

Insights

This study details bacteriophage PRD1 assembly, revealing how its protein shell and lipid membrane form infectious virus particles. Key assembly factors facilitate membrane translocation and DNA packaging for viral replication in Escherichia coli.

Area of Science:

  • Virology
  • Molecular Biology
  • Structural Biology

Background:

  • Bacteriophage PRD1 is a lipid-enveloped virus infecting Escherichia coli.
  • It possesses a unique structure with an outer protein shell, a lipid-protein membrane, and a dsDNA genome.

Purpose of the Study:

  • To elucidate the structure and assembly process of bacteriophage PRD1.
  • To understand the roles of specific proteins and assembly factors in viral formation.

Main Methods:

  • Structural analysis of bacteriophage PRD1 components.
  • Investigation of protein-lipid interactions during viral assembly.
  • Identification of nonstructural assembly factors involved in membrane translocation.

Main Results:

  • PRD1 has a 65 nm diameter, with membrane proteins inserting into the host membrane and capsid proteins forming cytoplasmic multimers.
  • Assembly factors facilitate the translocation of the virus-specific membrane, creating cytoplasmic empty particles.
  • DNA packaging into these particles results in infectious virions.

Conclusions:

  • Bacteriophage PRD1 assembly is a complex, multi-step process involving coordinated protein-protein and protein-lipid interactions.
  • The identified assembly factors are crucial for efficient viral particle formation.
  • Understanding PRD1 assembly provides insights into viral morphogenesis and host-pathogen interactions.

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