Figure 4.

XerC_Ab and XerD_Ab binding to recombination sites. Labeled oligodeoxynucleotides were incubated in the absence or presence of the proteins indicated at the top. The products were separated by electrophoresis in an 8% polyacrylamide gel and treated as described in Materials and Methods. The nucleotide sequences of the potential Xer recombination sites tested are shown below the gels. (A) XerC and XerD binding sites identical to dif and numerous A. baumannii plasmids. (B,C) Matched and mismatched sites from the progenitor black molecule, respectively (see Figure 3).