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Vaccinia virus G4L gene encodes a second glutaredoxin
B O Gvakharia1, E K Koonin, C K Mathews
1Department of Biochemistry and Biophysics, Oregon State University, Corvallis 97331-7305, USA.
Virology
|December 15, 1996
Summary
Vaccinia virus G4L protein, a glutaredoxin, shows early and continuous expression during infection. Its conservation across poxviruses suggests a crucial role in viral replication.
Area of Science:
- Virology
- Molecular Biology
- Biochemistry
Background:
- Vaccinia virus (VV) encodes a late-acting glutaredoxin (O2L).
- The function and expression timing of other potential VV glutaredoxins remain largely uncharacterized.
Purpose of the Study:
- To investigate the function and expression pattern of the VV G4L protein.
- To determine the evolutionary conservation and potential role of G4L in poxvirus replication.
Main Methods:
- Sequence analysis to identify glutaredoxin-like proteins.
- Enzyme activity assays (thioltransferase, dehydroascorbate reductase).
- Western blot analysis to detect G4L protein expression in infected cells.
Main Results:
- VV G4L protein exhibits glutaredoxin-like enzymatic activities.
- G4L is expressed early (4 hours) and constitutively throughout VV infection (up to 24 hours).
- A homologous protein is found in Molluscum Contagiosum virus (MCV), suggesting evolutionary conservation.
Conclusions:
- VV G4L is a functional glutaredoxin with a distinct expression profile compared to O2L.
- The conservation of G4L across poxviruses indicates its essential role in the viral life cycle, potentially in replication.