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The influenza virus polymerase associates to an important number of transcription-related proteins, including the largest subunit of the RNA polymerase II complex (RNAP II). Despite this association, degradation of the RNAP II takes place in the infected cells once viral transcription is completed. We have previously shown that the chromatin remodeler CHD6 protein interacts with the influenza virus polymerase complex, represses viral replication, and relocalizes to inactive chromatin during influenza virus infection. In this paper, we report that CHD6 acts as a negative modulator of the influenza virus polymerase activity and is also subjected to degradation through a process that includes the following characteristics: (i) the cellular proteasome is not implicated, (ii) the sole expression of the three viral polymerase subunits from its cloned cDNAs is sufficient to induce proteolysis, and (iii) degradation is also observedin vivo in lungs of infected mice and correlates with the increase of viral titers in the lungs. Collectively, the data indicate that CHD6 degradation is a general effect exerted by influenza A viruses and suggest that this viral repressor may play an important inhibitory role since degradation and accumulation into inactive chromatin occur during the infection.

CHD6, a Cellular Repressor of Influenza Virus Replication, Is Degraded in Human Alveolar Epithelial Cells and Mice Lungs during Infection