Cross-regulation of viral kinases with cyclin A secures shutoff of host DNA synthesis

Boris Bogdanow, Max Schmidt, Henry Weisbach, Iris Gruska, Barbara Vetter, Koshi Imami, Eleonore Ostermann, Wolfram Brune, Matthias Selbach, Christian Hagemeier, Lüder Wiebusch

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Received Date: 17th December 19

Herpesviruses encode conserved protein kinases to stimulate phosphorylation-sensitive processes during infection. How these kinases bind to cellular factors and how this impacts their regulatory functions is poorly understood. Here, we use quantitative proteomics to determine cellular interaction partners of human herpesvirus (HHV) kinases. We find that these kinases can target key regulators of transcription and replication. The interaction with Cyclin A and associated factors is identified as a specific signature of β-herpesvirus kinases. Cyclin A is recruited via RXL/Cy docking motifs that overlap with nuclear localization signals (NLS) and locate in the non-catalytic N-terminal regions. This architecture is conserved for viral kinases of HHV6, HHV7 and rodent cytomegaloviruses (CMVs). Docking to Cyclin A competes with NLS function, enabling dynamic changes in kinase localization and substrate phosphorylation. The viral kinase redirects Cyclin A to the cytosol, which is essential for the inhibition of cellular DNA replication during infection. Our data highlight a fine-tuned and physiologically important interplay between a cellular cyclin and viral kinases.

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This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.

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