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Production and Visualization of Bacterial Spheroplasts and Protoplasts to Characterize Antimicrobial Peptide Localization
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Characterization and localization of CIV polypeptides.

M Cerutti1, G Devauchelle

  • 1Centre de Recherches de Biochimie et Physiologie cellulaires, Equipe de Virologie, UA 203, Université de Rouen, Mont Saint Aignan, France.

Virology
|August 1, 1985
PubMed
Summary
This summary is machine-generated.

This study investigates the structural proteins of Canine Iridescent Virus (CIV), identifying disulfide-linked complexes and their subunits. Findings reveal specific polypeptides binding to CIV DNA, contributing to a proposed structural model.

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Area of Science:

  • Virology
  • Structural Biology
  • Molecular Biology

Background:

  • Understanding the structural organization of viruses is crucial for comprehending their replication and assembly.
  • Canine Iridescent Virus (CIV) is a large dsDNA virus with a complex protein structure that requires detailed characterization.

Purpose of the Study:

  • To identify and characterize structural proteins of CIV, particularly those involved in disulfide bonds.
  • To analyze the interactions of CIV structural proteins with viral DNA.
  • To propose a structural model for CIV based on the identified protein components and their linkages.

Main Methods:

  • Two-dimensional electrophoresis (nonreducing then reducing conditions) to analyze disulfide-linked viral polypeptides.
  • N-[14C]ethylmaleimide labeling to detect sulfhydryl-containing polypeptides and analyze residue accessibility.
  • Radioiodination ([125I]iodosulfanilic acid) to identify externally exposed polypeptides.
  • DNA-binding assays to determine the affinity of viral polypeptides for CIV DNA.

Main Results:

  • Disulfide-linked complexes were identified as trimers (P'50) or dimers (P60, P10).
  • Conformational changes in P81, P53, and P49 were observed due to the reduction of intramolecular disulfide bonds.
  • Sulfhydryl groups were detected in P'50-P50, P60, P100, and P33.
  • The P50 polypeptide was the primary externally exposed protein, while P'50 showed limited labeling.
  • Six polypeptides (P81, P60, P31, P17, P13, P10) demonstrated high affinity for CIV DNA.

Conclusions:

  • The study elucidates the role of disulfide bonds in the structural integrity of CIV proteins.
  • Specific viral polypeptides involved in DNA binding have been identified, providing insights into genome packaging.
  • A structural model for CIV is proposed, integrating the findings on protein complexes, disulfide linkages, and DNA interactions.