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Structural and functional analysis of the origin of conjugal transfer of the broad-host-range IneW plasmid R388 and comparison with the related IncN plasmid R46

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Summary

We cloned and sequenced a 402 by DNA segment containing the origin of conjugal transfer (oriT) of the IncW plasmid R388. Progressive deletions from each end of the sequence were assayed for oriT activity. Stepwise reductions in mobilization frequencies, representing the loss of functional elements, correlated with deletion of structural motifs in the sequence. A sequence of 330 by of oriT was sufficient for efficient mobilization. The first 86 by of the sequence contains five tandemly repeated DNA sequences of 11 bp, followed by a 10 by perfect inverted repeat. Deletion of the first 95 by reduced the frequency of transfer by a hundred-fold. The sequence between by 183 and 218 was necessary and sufficient for low frequency mobilization and, thus, it was assumed to contain the nick site. This basis core was cloned as a 60 by segment (from by 176–236) that could be mobilized at low frequency. It includes two inverted repeats and a perfect integration host factor (IHF) consensus binding site. A third functionally important segment in oriT was located between by 260 and 330. The DNA sequence of the oriT of R388 could be aligned with that of the broad-host-range IncN plasmid R46. Moreover, the relative positions of the three inverted repeats are also conserved. Overall sequence similarity was 52%, but was significantly higher in particular regions, whch coincided with the functionally important segments mapped by deletion analysis. Conservation of these segments provided independent support for their essential role in oriT function.

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Authors and Affiliations

  1. Departamento de Biologia Molecular, Universidad de Cantabria, C/Herrera Oria, s/n., 39011, Santander, Spain

    Matxalen Llosa, Silvia Bolland & Fernando de la Cruz

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  1. Matxalen Llosa
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  2. Silvia Bolland
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  3. Fernando de la Cruz
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Communicated by H. Hennecke

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Llosa, M., Bolland, S. & de la Cruz, F. Structural and functional analysis of the origin of conjugal transfer of the broad-host-range IneW plasmid R388 and comparison with the related IncN plasmid R46. Molec. Gen. Genet. 226, 473–483 (1991). https://doi.org/10.1007/BF00260661

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