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. 1989 Feb;171(2):1166–1172. doi: 10.1128/jb.171.2.1166-1172.1989

Replication and segregational stability of Bacillus plasmid pBAA1.

K M Devine 1, S T Hogan 1, D G Higgins 1, D J McConnell 1
PMCID: PMC209715  PMID: 2492507

Abstract

A cryptic plasmid, pBAA1, was identified in an industrial Bacillus strain. The plasmid is 6.8 kilobases in size and is present in cells at a copy number of approximately 5 per chromosome equivalent. The plasmid has been maintained under industrial fermentation conditions without apparent selective pressure and so is assumed to be partition proficient. The minimal replicon was localized to a 1.4-kilobase fragment which also contains the functions required for copy number control. The very low level of segregational instability of the minimal replicon suggests that it also contains functions involved in plasmid maintenance. Comparison with other plasmids indicates that pBAA1 belongs to the group of small gram-positive plasmids which replicate by a rolling cycle-type mechanism. A sequence was identified which is required for the efficient conversion of the single plus strand to the double-stranded form during plasmid replication. Deletion of this sequence resulted in a low level of segregational plasmid instability.

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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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