Sequential strand exchange by XerC and XerD during site-specific recombination at dif.
Successful segregation of circular chromosomes in Escherichia coli requires that dimeric replicons, produced by homologous recombination, are converted to monomers prior to cell division. The Xer site-specific recombination system uses two related tyrosine recombinases, XerC and XerD, to catalyze resolution of circular dimers at the chromosomal site, dif. A 33-base pair DNA fragment containing the 28-base pair minimal dif site is sufficient for the recombinases to mediate both inter- and intr...Expand abstract
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