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. 1981 Jan;37(1):139–147. doi: 10.1128/jvi.37.1.139-147.1981

Adenovirus DNA replication in vitro: a protein linked to the 5' end of nascent DNA strands.

B W Stillman
PMCID: PMC170990  PMID: 7218423

Abstract

Soluble nuclear extracts prepared from adenovirus-infected HeLa cells supported adenovirus DNA replication with exogenous DNA-protein complex as template, but protease-treated, phenol-extracted DNA was less active. Replication was enhanced when creatine phosphate and creatine phosphokinase were included in the reaction mixture, rendering the reaction independent of exogenous ATP. Genomic-length, newly synthesized DNA strands were first observed 30 min after initiation of replication and continued to increase in amount for at least 4 h. Thus, the rate of replication is consistent with previous estimates of the rate of replication in vivo. Nascent DNA strands bound to benzoylated, naphthoylated DEAE-cellulose due to their association with protein. The 5' termini of nascent DNA strands were resistant to the 5'- to 3'-specific T7 exonuclease, and the 3' termini of nascent strands were sensitive to the 3'- to 5'-specific exonuclease III. These results suggest that a protein becomes covalently linked to the 5' termini of nascent DNA strands replicated in vitro. Nuclear extracts prepared from adenovirus type 2-infected cells also supported replication of DNA-protein complex prepared from the unrelated type 7 adenovirus. The limited sequence homology between these two viruses at the origin of replication further defines recognition sequences at the origin. These results are discussed in terms of a model for adenovirus DNA replication in which the terminal protein and sequences within the inverted terminal repetition are involved in the formation of an initiation complex that is able to prime DNA replication.

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Selected References

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