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. 1978 Aug;135(2):612–621. doi: 10.1128/jb.135.2.612-621.1978

Isolation and characterization of a Clo DF13::Tn901 plasmid mutant with thermosensitive control of DNA replication.

P M Andreoli, R A Brandsma, E Veltkamp, H J Nijkamp
PMCID: PMC222422  PMID: 355238

Abstract

After nitrosoguanidine mutagenesis, a mutant Escherichia coli strain harboring the Clo DF13::Tn901 plasmid pJN03 was isolated that is thermosensitive (Ts) for growth at 43 degrees C. The mutation responsible for this thermosensitive phenotype resides on the pJN03 plasmid genome. Cells harboring the pJN03 cop-1(Ts) plasmid mutant showed a large increase in plasmid copy number at 43 degrees C accompanied by an increase in the synthesis of plasmid-specified gene products like cloacin DF13 and beta-lactamase. The pJN03 cop-1(Ts) mutant showed uncontrolled plasmid DNA replication at the nonpermissive temperature. Analysis of plasmid deletions showed that the mutation is located in the Clo DF13 map interval from 0 to 12% or 29 to 45%. This implies that native cloacin DF13 and the Clo DF13-specified polypeptides B, C, D, E, and G are not involved in the pleiotropic phenotype of the plasmid mutant pJN03 cop-1(Ts).

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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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