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. 1979 Jul;76(7):3097–3101. doi: 10.1073/pnas.76.7.3097

Isolation and mapping of plasmids containing the Salmonella typhimurium origin of DNA replication.

J W Zyskind, L T Deen, D W Smith
PMCID: PMC383770  PMID: 386330

Abstract

A purified EcoRI restriction endonuclease fragment that determines resistance to kanamycin and is incapable of self-replication was used to select autonomously replicating fragments from an EcoRI digest of a Salmonella typhimurium F' plasmid containing the chromosomal region believed to include the S. typhimurium origin of DNA replication. Both the F factor and S. typhimurium chromosome replication origins were cloned by this procedure. The EcoRI fragmentment containing the S. typhimurium origin of replication is 19.4 kilobase pairs long and includes functional asp+ and uncB+ genes. Restriction endonuclease analysis of deletions obtained from the S. typhimurium origin plasmid indicated that the replication origin (ori region) is contained within a 3.3-kilobase pair region. Comparison with Escherichia coli origin plasmids shows colinearity of gene arrangement on the chromosomes in this region and suggests that some, but not all, regions of the nucleotide sequence in the origin region may be conserved (identical) in these two bacterial species.

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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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