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Initiation of adenovirus DNA replication is dependent on a complex of the precursor of the terminal protein and the adenovirus-coded DNA polymerase (pTP-pol complex). This complex catalyzes the formation of a covalent linkage between dCMP and pTP in the presence of a functional origin of DNA replication residing in the terminal nucleotide sequence of adenovirus DNA. We have purified the pTP-pol complex of adenovirus type 5 and studied its binding to double-stranded DNA. Using DNA-cellulose chromatography it could be shown that the pTP-pol complex has a higher affinity for adenovirus DNA than for calf thymus or pBR322 DNA. From the differential binding of the pTP-pol complex to plasmids containing adenovirus terminal sequences with different deletions, it has been concluded that a sequence of 14 nucleotide pairs at positions 9-22 plays a crucial role in the binding of pTP-pol to adenovirus DNA. This region is conserved in the DNA's of all human adenovirus serotypes and is obviously an important structural element of the adenovirus origin of DNA replication. Comparative binding studies with adenovirus DNA polymerase and pTP-pol indicated that pTP is responsible for the binding. The nature of the binding of pTP-pol to the conserved sequence will be discussed.

Specific binding of the adenovirus terminal protein precursor-DNA polymerase complex to the origin of DNA replication