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Structure determination of the phiX174 closed procapsid

T Dokland1, R McKenna, D M Sherman

  • 1Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA.

Acta Crystallographica. Section D, Biological Crystallography
|October 3, 1998
PubMed
Summary

The structure of the phiX174 bacteriophage procapsid was determined to 3.5 A resolution using X-ray crystallography. This reveals the arrangement of its D, F, G, and B proteins.

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Area of Science:

  • Structural Biology
  • Virology
  • Biophysics

Background:

  • The bacteriophage phiX174 is a model system for studying single-stranded DNA viruses.
  • Understanding viral procapsid structure is crucial for deciphering infection mechanisms and developing antiviral strategies.

Purpose of the Study:

  • To determine the high-resolution three-dimensional structure of the phiX174 bacteriophage procapsid.
  • To elucidate the protein-protein interactions and assembly of the viral capsid.

Main Methods:

  • X-ray crystallography was employed to determine the procapsid structure.
  • Synchrotron radiation and oscillation X-ray diffraction data were collected.
  • Molecular replacement and real-space averaging, aided by cryo-electron microscopy, were used for structure solution.

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Main Results:

  • The crystal structure of the phiX174 procapsid was resolved to 3.5 A resolution.
  • The arrangement of the D, F, G, and part of the B proteins within the icosahedral capsid was identified.
  • The crystal space group was determined as I213 with a unit-cell length of 774 A.

Conclusions:

  • The determined structure provides detailed insights into the architecture of the phiX174 procapsid.
  • This structural information can inform future studies on viral assembly and host interactions.