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. 1985 Jun;82(12):3988–3992. doi: 10.1073/pnas.82.12.3988

Initiation of DNA replication on single-stranded DNA templates catalyzed by purified replication proteins of bacteriophage lambda and Escherichia coli.

J H LeBowitz, M Zylicz, C Georgopoulos, R McMacken
PMCID: PMC397919  PMID: 2408273

Abstract

Initiation of bacteriophage lambda DNA replication at the chromosomal origin depends on the lambda O and P replication proteins. These two viral initiators, together with an Escherichia coli protein fraction, promote the replication in vitro of single-stranded circular DNA chromosomes such as that of bacteriophage M13. This nonspecific strand initiation reaction, which we have termed the "lambda single-strand replication reaction," has now been established with eight purified proteins, each of which is also required for replication of the phage lambda chromosome in vivo. An early rate-limiting step in the overall reaction is the ATP-dependent assembly of an activated nucleoprotein prepriming complex. In this step the lambda O and P initiators cooperate with the E. coli dnaJ and dnaK proteins to transfer the bacterial dnaB protein onto M13 DNA that is coated with the single-stranded DNA-binding protein. Multiple RNA primers are synthesized on each DNA circle when isolated prepriming complex is incubated with primase and rNTPs. In the complete system, DNA polymerase III holoenzyme extends the first primer synthesized into full-length complementary strands. Because the properties of this system are closely analogous to those found for the replication of phi X174 viral DNA by E. coli proteins, we infer that a mobile prepriming or priming complex (primosome) operates in the lambda single-strand replication reaction.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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