Abstract
In most bacteria, chromosome dimers arise from homologous recombination between replicated chromosomes. These dimers are then resolved by the action of the XerC and XerD recombinases, which act on the chromosomal dif site in the presence of the FtsK cell division protein. We have cloned the xerC and xerD genes from Caulobacter crescentus, and overexpressed them as maltose-binding protein fusion proteins. These fusion proteins were purified and used in in vitro DNA-binding assays to the Escherichia coli dif site with each protein individually, and in combination with each other. In addition, combinations of Xer proteins from E. coli were also tested for cooperativity with the corresponding C. crescentus proteins.
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