Abstract
Protein kinase CK2 is a Ser/Thr protein kinase that phosphorylates hundreds of substrates mainly related to survival and proliferation pathways. It has long been considered an anti-cancer drug target. However, during the recent COVID-19 pandemic, CK2 inhibitors have been repurposed as anti-SARS-CoV-2 drugs. This was based on the initial finding of CK2 among the proteins of the host cell that interact with the viral proteins and modulate the infection. Since then, several studies have deepened our understanding of the CK2/COVID-19 connection, and we deem it is time to review all the findings. Interestingly, other coronaviruses cross-talk with CK2 as well, with similarities and differences compared to the SARS-CoV-2 case. Therefore, we believe that the analysis of the effects obtained by targeting CK2 in case of coronavirus infections, both at the molecular and phenomenological level, will help in extrapolating information that could be useful not only for COVID-19 (whose pandemic emergency is hopefully turning off) but also for other infections.
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