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. 1980 Nov;144(2):579–591. doi: 10.1128/jb.144.2.579-591.1980

Transcription of bacteriocinogenic plasmid CloDF13 in vivo and in vitro: structure of the cloacin immunity operon.

P J van den Elzen, R N Konings, E Veltkamp, H J Nijkamp
PMCID: PMC294705  PMID: 6159346

Abstract

Escherichia coli minicells harboring plasmid CloDF13 synthesized at least 25 messenger ribonucleic acid (RNA) species; three of these RNAs, a 2,400-, a 2,200-, and a 100-nucleotide RNA, were synthesized in relatively large amounts. Using insertion and deletion mutants of CloDF13 as well as an RNA blotting technique, we could demonstrate that these three RNAs are transcripts from the CloDF13 DNA region from 0 to 40%. This region contains the cloacin and immunity genes and the genetic information involved in plasmid DNA replication. A transcription map of this region is presented and discussed. The data indicate that the cloacin and immunity genes were coordinately transcribed into messenger RNAs of about 2,400 and 2,200 nucleotides, which differ in length at their 3' terminus. RNA polymerase binding studies and in vitro transcription assays indicated that transcription of these genes initiates at a promoter located around 32% on the CloDF13 map. Furthermore, it is shown that a 100-nucleotide RNA is encoded by the CloDF13 DNA region between 7.7 and 8.8% on the plasmid genome; the synthesis of this RNA proceeds in a direction opposite to the transcription of the cloacin and immunity genes.

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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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