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Characterization of iridovirus IV1 polypeptides: mapping by surface labelling
1Institute of Biological Sciences, Carleton University, Ottawa, Ontario, Canada.
Research in Virology
|May 1, 1997
Summary
Researchers indexed Tipula iridescent virus (TIV) polypeptides using empty and filled virions. This study identified key viral proteins involved in capsid formation and maturation, aiding iridovirus classification.
Area of Science:
- Virology
- Molecular Biology
- Structural Biology
Background:
- Tipula iridescent virus (TIV) is an iridovirus with complex capsid structures.
- Understanding viral capsid formation and maturation is crucial for viral classification and control.
Purpose of the Study:
- To create a comprehensive index of polypeptides associated with "empty" and "filled" Tipula iridescent virus (TIV) virions.
- To identify candidate polypeptides involved in TIV capsid formation and maturation processes.
- To establish criteria for iridovirus classification based on polypeptide composition.
Main Methods:
- Enrichment of "empty" and "filled" TIV virions.
- One- and two-dimensional polyacrylamide gel electrophoresis.
- Silver staining, disulphide bond reduction, and 125I iodination of surface proteins.
Main Results:
- A comprehensive index of 103 polypeptides in empty and 116 polypeptides in filled TIV capsids was established.
- Refined estimates identified <= 70 unique polypeptides per capsid type.
- At least 10 polypeptides involved in intermolecular sulphhydryl linkages and 11 putative surface polypeptides were identified.
Conclusions:
- The study provides a detailed polypeptide map of TIV virions.
- Identified polypeptides offer insights into TIV capsid assembly and maturation.
- The data serve as valuable criteria for iridovirus classification and identification.