Protein kinase activity in equine herpesvirus

Area of Science:

• Virology
• Molecular Biology
• Biochemistry

Background:

• Equine herpesvirus (EHV) is a significant pathogen in horses.
• Viral protein phosphorylation plays a crucial role in virus replication and pathogenesis.
• Understanding virus-associated kinases is essential for developing antiviral strategies.

Purpose of the Study:

• To identify and characterize a protein kinase associated with equine herpesvirus.
• To investigate the enzymatic activity and substrate specificity of the identified kinase.
• To determine the role of this kinase in the virus life cycle.

Main Methods:

• Purification of equine herpesvirus.
• In vitro kinase assays using adenosine triphosphate-gamma-(32)P as a phosphate donor.
• Analysis of phosphorylated viral proteins using polyacrylamide gel electrophoresis.
• Enzymatic characterization of kinase activity, including cofactor requirements and substrate analysis.

Main Results:

• A protein kinase intimately associated with equine herpesvirus was identified.
• The kinase activity requires Mg(2+) and is enhanced by protamine or arginine-rich histone.
• Phosphorylation occurs primarily on serine and threonine residues of viral proteins.
• All 17 resolved viral protein bands were labeled, indicating broad substrate specificity.

Conclusions:

• Equine herpesvirus encodes or associates with a protein kinase that phosphorylates viral proteins.
• This kinase may play a role in regulating viral protein function during infection.
• Further studies are warranted to elucidate the precise function of this kinase in EHV replication.