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. 1990 Feb;87(3):1109–1113. doi: 10.1073/pnas.87.3.1109

Site-specific DNA recombination system Min of plasmid p15B: a cluster of overlapping invertible DNA segments.

H Sandmeier 1, S Iida 1, J Meyer 1, R Hiestand-Nauer 1, W Arber 1
PMCID: PMC53420  PMID: 2405394

Abstract

Plasmid p15B of Escherichia coli 15T- carries a 3.5-kilobase segment that undergoes frequent DNA inversion mediated by the DNA inversion enzyme Min, a member of the Din family of site-specific recombinases. While the previously described Din inversion systems invert a DNA segment between two crossover sites in inverted orientation, the Min system produces more complex DNA rearrangements. These have been physically characterized by electron microscopy and by restriction cleavage analysis. The results can best be explained by a model that involves six crossover sites (called mix) and predicts 240 isomeric forms of the invertible region. The model was confirmed by sequencing the six mix sites in plasmids that contain the invertible DNA segments in a frozen configuration. All mix sites fit the dix consensus sequence, and they are all good substrates for DNA inversion when carried in inverted orientation. Recombination between two mix sites in direct orientation was rare, in line with the notion that Din inversion systems are topologically biased to the inversion reaction. Another recently described multiple inversion system, the shufflon of the E. coli plasmid R64, is neither functionally nor structurally related to the Min system of p15B.

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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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