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Related Experiment Videos

Structural studies of bacteriophage alpha3 assembly.

Ricardo A Bernal1, Susan Hafenstein, Norman H Olson

  • 1Department of Biological Sciences, Purdue University, 1392 Lilly Hall, West Lafayette, IN 47907-1392, USA.

Journal of Molecular Biology
|December 11, 2002
PubMed
Summary

Bacteriophage alpha3

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Area of Science:

  • Structural biology
  • Virology
  • Biochemistry

Background:

  • Bacteriophage alpha3 is a Microviridae family member, similar to phiX174.
  • These phages possess single-stranded DNA genomes within icosahedral capsids.

Purpose of the Study:

  • To elucidate the structural differences between alpha3 and phiX174.
  • To understand the assembly and DNA packaging mechanisms of bacteriophage alpha3.

Main Methods:

  • Cryo-electron microscopy (cryo-EM) at 15Å resolution for the open procapsid.
  • X-ray crystallography at 3.5Å resolution for the mature virion.

Main Results:

  • The alpha3 open procapsid exhibits unique pores (30Å at 3-fold vertices) and gaps, unlike phiX174.

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  • Protein B scaffolding facilitates procapsid assembly and is likely removed via these pores.
  • Alpha3 virions differ from phiX174 in spike rotation and a shorter DNA-binding protein (J protein).

    • Conclusions:

    • The structural findings provide insights into bacteriophage assembly and DNA packaging.
    • Alpha3's unique structural features suggest distinct biological functions compared to phiX174.