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. 1993 Apr;175(7):1988–1994. doi: 10.1128/jb.175.7.1988-1994.1993

Analysis of features contributing to activity of the single-stranded origin of Bacillus plasmid pBAA1.

L Seery 1, K M Devine 1
PMCID: PMC204283  PMID: 8458841

Abstract

The features which contribute to the activity of the single-stranded origin of the Bacillus plasmid pBAA1 were investigated. This origin is contained on a DNA fragment greater than 116 but less than 191 bases in size. There is the potential to form three stem-loop structures within this fragment. Comparison of the sequence of this origin from pBAA1 with the sequence of a homologous fragment from the Bacillus thuringiensis plasmid pGI2 indicates that both the structure and the relative positioning of the predicted stem-loops are important for origin activity. Deletion analysis suggests that it is the structure of stem-loop III which is important, because it can be replaced by a nonrelated dyad element without significant loss of origin activity. Three sequence motifs are conserved between the origins from pBAA1 and pGI2. Mutation of motif 1 leads to attenuation of single-stranded origin activity. A second motif (motif 3) shares significant homology with a group of single-strand initiation (ssi) sites found on plasmids isolated from Escherichia coli, suggesting that it also contributes to single-stranded origin activity. Our results also indicate that RNA polymerase is utilized to synthesize the RNA primer at the pBAA1 single-stranded origin and that this origin can function in both Bacillus subtilis and Staphylococcus aureus.

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Selected References

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