Characterization of the binding reaction of Rep1A protein with iteron DNA by EMSA and footprinting. (a). Iteron of pWTY27. Possible iteron sequences from 338 to 606 bp on pWTY27 and AT-rich regions are shown. DR: direct repeat; IR: inverted repeat. The RepA binding sequences determined by DNA footprinting are boxed. The binding sequences of RepA protein are indicated by shading. (b). Detection of the binding activity of RepA protein with the iteron by EMSA. The DNA probe for each lane was 2 ng and the unlabeled probe was also used as specific competitor. The DNA-protein complex is indicated. (c). Determination of the binding sequence by DNA footprinting. The γ[32p]ATP-radiolabelled primer was sequenced and electrophoresed (lanes G, A, T and C) as a control. The amounts of RepA protein used in lanes 1–5 were 0.17, 0.43, 0.85, 2.6 and 0 μg, respectively. Two sequences protected by RepA from digestion with DNaseI are shown and the RepA unbound sequences are underlined.
Wang et al. BMC Microbiology 2012 12:253 doi:10.1186/1471-2180-12-253