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- W2110316574 abstract "Summary In vitro studies have demonstrated that Hin‐catalysed site‐specific DNA inversion occurs within a tripartite invertasome complex assembled at a branch on a supercoiled DNA molecule. Multiple DNA exchanges within a recombination complex (processive recombination) have been found to occur with particular substrates or reaction conditions. To investigate the mechanistic properties of the Hin recombination reaction in vivo , we have analysed the topology of recombination products generated by Hin catalysis in growing cells. Recombination between wild‐type recombination sites in vivo is primarily limited to one exchange. However, processive recombination leading to knotted DNA products is efficient on substrates containing recombination sites with non‐identical core nucleotides. Multiple exchanges are limited by a short DNA segment between the Fis‐bound enhancer and closest recombination site and by the strength of Fis–Hin interactions, implying that the enhancer normally remains associated with the recombining complex throughout a single exchange reaction, but that release of the enhancer leads to multiple exchanges. This work confirms salient mechanistic aspects of the reaction in vivo and provides strong evidence for the propensity of plectonemically branched DNA in prokaryotic cells. We also demonstrated that a single DNA exchange resulting in inversion in vitro is accompanied by a loss of four negative supercoils." @default.
- W2110316574 created "2016-06-24" @default.
- W2110316574 creator A5021981216 @default.
- W2110316574 creator A5057365266 @default.
- W2110316574 date "2003-12-22" @default.
- W2110316574 modified "2023-10-16" @default.
- W2110316574 title "Topological analysis of Hin-catalysed DNA recombination in vivo and in vitro" @default.
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- W2110316574 doi "https://doi.org/10.1046/j.1365-2958.2003.03890.x" @default.
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