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Nuclear footprinting revealed a temporal program involving factor binding to the repetitive GC-box DNA elements present in the simian virus 40 regulatory region. This program specified ordered and directional binding to these tandem regulatory sequences in vivo during the late phase of infection. The program was interrupted by the DNA replication inhibitor aphidicolin or by inactivation of the viral replication factor simian virus 40 T antigen, suggesting a link between viral DNA replication and new factor binding. Measurements of DNA accumulation in viruses lacking either the distal or proximal halves of the GC-box region suggested that the region has a dual role in replication control. Overall, the data point to important relationships between DNA replication and factor binding to the GC-box DNA, a multifunctional regulatory region.

Programmed factor binding to simian virus 40 GC-box replication and transcription control sequences