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. 1977 Dec;74(12):5458–5462. doi: 10.1073/pnas.74.12.5458

Cloning and mapping of the replication origin of Escherichia coli.

S Yasuda, Y Hirota
PMCID: PMC431763  PMID: 341158

Abstract

The replication origin of Escherichia coli has been cloned on a nonreplicating DNA fragment coding for ampicillin resistance. This recombinant DNA, named pSY211, replicates depending on the presence of the replication origin and can be recovered as a closed circular plasmid DNA of 10.7 megadaltons (Mdal). A restriction map has been constructed. EcoRI cleaves pSY211 into two fragments: one is the ampicillin fragment of 4.5 Mdal and the other is a chromosomal fragment of 6 Mdal and contains the origin. The 6 Mdal EcoRI fragment has four BamHI sites, three HindIII sites, and one Xho I site. A mutant of pSY211 has been isolated which is lacking two BamHI fragments of the chromosomal fragment. In recA hosts, pSY211 is lost at a high frequency. In recA+ hosts, pSY211 is integrated into the chromosome due to nucleotide sequence homology between pSY211 and the replication origin of the E. coli chromosome. The integration site has been mapped. We conclude that the replication origin is located at a site between uncA and rbsK, at about 83 min on the genetic map of E. coli.

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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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