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Constraints placed on viral genome size require that these pathogens must employ sophisticated, yet parsimonious mechanisms to effectively integrate with host cell signaling pathways. Poxviruses are no exception and employ several methods to balance these goals, including encoding single proteins that impact multiple downstream pathways. This study focuses on the vaccinia virus B1 protein kinase, an enzyme that promotes virus replication at multiple phases of the viral lifecycle. Herein, we demonstrate that in addition to its previously characterized functions, B1 inhibits vaccinia virus B12 protein via a phosphorylation-dependent mechanism and that this function of B1 can be complemented by the cellular B1 homolog VRK2. Combined with previous data implicating functional overlap between B1 and an additional cellular B1 homolog, VRK1, these data provide evidence of how poxviruses can be multifaceted in their mimicry of cellular proteins through the consolidation of functions of both VRK1 and VRK2 within the viral B1 protein kinase.

journal of virology

The Vaccinia Virus (VACV) B1 and Cellular VRK2 Kinases Promote VACV Replication Factory Formation through Phosphorylation-Dependent Inhibition of VACV B12