Replication of adenovirus and SV40 chromosomes in vitro.

T. J. Kelly, P. J. Rosenfeld, R. J. Wides, E. A. O'Neill, J. J. Li, M. S. Wold

Research output: Contribution to journalReview articlepeer-review


As an approach to studying the mechanisms involved in the replication of eukaryotic chromosomes, we have developed and characterized cell-free replication systems for the animal viruses, adenovirus and SV40. In this report we summarize recent work on the proteins required for the initiation of DNA synthesis in these two systems. The adenovirus origin of DNA replication was shown to consist of three functionally distinct sequence domains. Cellular proteins that specifically recognize each of these domains were purified and characterized. Initiation of adenovirus DNA replication was reconstituted from two virus-encoded and three cell-encoded factors. The SV40 origin of replication consists of a 65 base pair DNA segment that contains a high affinity binding site for the viral initiation protein T antigen. Evidence is presented that the first step in initiation of SV40 DNA replication involves the specific binding of T antigen to the origin, followed by the local unwinding of the two strands of the template. The unwinding reaction is specific for DNA templates containing the SV40 origin and requires ATP hydrolysis. In addition to T antigen, efficient unwinding requires a cellular factor(s) that can be replaced by the single-stranded DNA binding protein of Escherichia coli. These results indicate that the recently discovered helicase activity of T antigen plays a central role in initiation of viral DNA synthesis.

Original languageEnglish (US)
Pages (from-to)429-438
Number of pages10
JournalPhilosophical transactions of the Royal Society of London. Series B, Biological sciences
Issue number1187
StatePublished - Dec 15 1987

ASJC Scopus subject areas

  • General Biochemistry, Genetics and Molecular Biology
  • General Agricultural and Biological Sciences


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