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. 1993 Feb 11;21(3):641–647. doi: 10.1093/nar/21.3.641

The adenovirus DNA binding protein effects the kinetics of DNA replication by a mechanism distinct from NFI or Oct-1.

Y M Mul 1, P C van der Vliet 1
PMCID: PMC309164  PMID: 8441675

Abstract

Initiation of adenovirus DNA replication in vitro minimally requires the viral TP-DNA template and the precursor terminal protein-DNA polymerase heterodimer (pTP-pol). Optimal initiation occurs in the presence of the cellular transcription factors NFI and Oct-1 and the viral DNA binding protein (DBP). We have studied the influence of these three stimulatory proteins on the kinetics of formation of the pTP-dCMP initiation complex. NFI increases the Vmax of the reaction but does not affect the apparent Km for dC-TP. This indicates that NFI acts by enlarging the amount of active initiation complex in agreement with its stabilizing effect on binding of pTP-pol to the template. Similar kinetic effects were observed for Oct-1. Since Oct-1 does not stabilize binding of pTP-pol to the origin this suggests that Oct-1 increases the rate of pTP-dCMP formation. DBP stimulates the initiation reaction in two ways. First, it moderately increases the Vmax at suboptimal NFI concentrations, which is related to its enhancing effect on binding of NFI to the origin. Second, a much larger stimulation was caused by DBP itself based on a reduction of the Km for dCTP, which was independent of the concentration of pTP-pol or NFI. The Km for dCTP during initiation is lower than during elongation.

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Selected References

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