Complementation of bh0463A in a dam^- Escherichia coli strain results in adenine methylation of plasmid DNA.

Control plasmid pAE30 (lanes 1, 3, 5, and 7) and a bh0463A complementation plasmid (pAE35; lanes 2, 4, 6, and 8) were extracted from a dam^- E. coli strain and subjected to digestion with DpnI (lanes 3 and 4), MboI (lanes 5 and 6), or Sau3AI (lanes 7 and 8). DpnI, MboI, and Sau3A1 cut GATC sequences that are adenine methylated, adenine non-methylated, or cytosine non-methylated, respectively. Sizes of selected molecular weight standards (mws) of 100 bp DNA ladder (New England Biolabs) are shown on the left in base pairs.