Tyrosine phosphorylation events during coxsackievirus B3 replication

Area of Science:

• Virology
• Molecular Biology
• Cellular Biology

Background:

• Cellular protein tyrosine phosphorylation plays a role in various cellular processes.
• Enteroviruses, including Coxsackievirus B3 (CVB3), are known pathogens with complex interactions with host cells.

Purpose of the Study:

• To investigate the interplay between CVB3 replication and cellular protein tyrosine phosphorylation.
• To identify specific cellular proteins affected by CVB3 infection and their role in viral pathogenicity.

Main Methods:

• Western blotting with antiphosphotyrosine antibodies to detect protein phosphorylation.
• Subcellular fractionation to determine the localization of phosphorylated proteins.
• Treatment with protein tyrosine kinase inhibitors (Herbimycin A) and other kinase inhibitors (staurosporine, calphostin C).
• Immunoprecipitation to identify the origin of phosphorylated proteins.

Main Results:

• CVB3 infection enhanced tyrosine phosphorylation of 48 kDa (cytosolic) and 200 kDa (membrane) proteins in HeLa cells.
• Increased tyrosine phosphorylation of a 200 kDa protein was observed in Vero cells infected with CVB3, echovirus 11 (EV11), or echovirus 12 (EV12).
• Herbimycin A inhibited virus-induced tyrosine phosphorylations and reduced progeny virion production, while staurosporine and calphostin C did not affect virion synthesis.
• The 200 kDa tyrosine-phosphorylated protein in CVB3-infected cells was identified as being of cellular origin.

Conclusions:

• Enterovirus replication, including CVB3, significantly impacts cellular protein tyrosine phosphorylation.
• Tyrosine phosphorylation events are important for efficient enterovirus replication.
• Targeting cellular tyrosine phosphorylation pathways may offer strategies to control enterovirus infections.