Abstract
The lytic phase of JC virus (JCV) appears to be highly complex and remains elusive. A growing body of experimental evidence suggests that the regulation of JCV gene expression and replication requires, in addition to the presence of specific transcription factors, cooperativity between viral and cellular regulatory proteins. This cooperativity may be accomplished by physical interaction of the participant proteins on and/or off the viral DNA sequence. Here, we present evidence of specific physical and functional interaction between a cellular factor, YB-1, and the JCV early protein, T-antigen, and showed that both proteins play important roles in JCV gene transcription. Additionally, our data indicate that YB-1 also functionally interact with another viral protein, designated agnoprotein, which is expressed late during the course of infection, adding further complexity to the currently known picture on JCV gene regulation.
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