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. 1994 Sep;176(18):5718–5728. doi: 10.1128/jb.176.18.5718-5728.1994

Molecular analysis and characterization of a broad-host-range plasmid, pEP2.

Y Zhang 1, J Praszkier 1, A Hodgson 1, A J Pittard 1
PMCID: PMC196776  PMID: 7521871

Abstract

Plasmid pEP2 was found to encode a protein, RepA, which is essential and rate limiting for its replication in Escherichia coli and Corynebacterium pseudotuberculosis. Mutations which altered the rate of synthesis of this protein in E. coli affected the copy number and segregational stability of pEP2 in the two hosts. RepA contains 483 amino acid residues and has the calculated molecular weight of 53,925. It shows 45% amino acid residue identity with open reading frame ORF2 of pSR1, a plasmid isolated from Corynebacterium glutamicum (J. A. C. Archer and A. J. Sinskey, J. Gen. Microbiol. 139:1753-1759, 1993). Plasmid pEP2 was shown to accumulate single-stranded DNA corresponding to the RepA coding strand during its replication in E. coli and C. pseudotuberculosis, suggesting that it may replicate by a rolling circle mechanism. However, RepA has no significant sequence homology with the replication initiator proteins of plasmids known to use this mode of replication.

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Selected References

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