Figure 1.

The structures of selected bacterial chromosomes’ and plasmids’ origin regions. In the schemes, the motifs and sequences are marked as colored arrows and rectangles: R-type DnaA-boxes (dark green arrow), weak-DnaA-boxes (light green arrow), tmaDnaA-boxes (very light green arrows), AT-rich region (light blue shading), repeat in DUE region (dark blue arrow), DUE (rectangle), Integration Host Factor binding site (IBS) (yellow rectangle), Rep proteins binding sites (iterons) (red arrows), RctB binding sites (dark red arrows and red rectangle), E.coli DnaA binding sites in DUE 5′TTATT3′ (light cyan rectangle) and 5′TTGT3′ (cyan rectangle), V. cholerae ori2 repeats in DUE 5′^G/_AATCA3′ (short purple arrow). In E. coli oriC, the names of particular motifs are written above the scheme.