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. 2000 Apr 11;97(8):3971–3976. doi: 10.1073/pnas.97.8.3971

Figure 4.

Figure 4

Crystal packing of the d(CCGGTACCGG) Holliday junction (A) and d(CCGCTAGCGG) B-DNA (B) structures in the a–c plane. Four strands in each panel are colored in red, with symmetry related DNAs in blue. In A, four DNA strands associate as a single Holliday junction in the asymmetric unit. A 2-fold axis runs through the junction but is slightly shifted from the edge of the unit cell. Because this is a noncrystallographic symmetry axis, the c-axis of the d(CCGGTACCGG) unit cell is extended compared with that of d(CCGCTAGCGG). In B, the four red strands associate to form two B-DNA duplexes related by true crystallographic 2-fold symmetry.