Multiple DNA binding activities of the novel site-specific recombinase, Piv, from Moraxella lacunata - PubMed (original) (raw)
. 1999 Apr 2;274(14):9698-706.
doi: 10.1074/jbc.274.14.9698.
Affiliations
- PMID: 10092658
- DOI: 10.1074/jbc.274.14.9698
Free article
Multiple DNA binding activities of the novel site-specific recombinase, Piv, from Moraxella lacunata
D M Tobiason et al. J Biol Chem. 1999.
Free article
Abstract
The recombinase, Piv, is essential for site-specific DNA inversion of the type IV pilin DNA segment in Moraxella lacunata and Moraxella bovis. Piv shows significant homology with the transposases of the IS110/IS492 family of insertion elements, but, surprisingly, Piv contains none of the conserved amino acid motifs of the lambda Int or Hin/Res families of site-specific recombinases. Therefore, Piv may mediate site-specific recombination by a novel mechanism. To begin to determine how Piv may assemble a synaptic nucleoprotein structure for DNA cleavage and strand exchange, we have characterized the interaction of Piv with the DNA inversion region of M. lacunata. Gel shift and nuclease/chemical protection assays, competition and dissociation rate analyses, and cooperativity studies indicate that Piv binds two distinct recognition sequences. One recognition sequence, found at multiple sites within and outside of the invertible segment, is bound by Piv protomers with high affinity. The second recognition sequence is located at the recombination cross-over sites at the ends of the invertible element; Piv interacts with this sequence as an oligomer with apparent low affinity. A model is proposed for the role of the different Piv binding sites of the M. lacunata inversion region in the formation of an active synaptosome.
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