Figure 5.

Structure of a nonspecific DNA complex of the CXC domain. (A) Overall structure of three CXC domains bound to (GC)₆ DNA. (B) Schematics of protein–DNA hydrogen bond interactions. (C,D) Detailed DNA interactions of CXC molecules 1 (C) and 2 (D). The 2f_o − f_c electron density map is shown at the 1.0 σ level for R543 and R526. Dashed lines denote hydrogen bonds. Two CXC molecules (1 and 2) are colored slate and green, the top and bottom strand of DNA are colored yellow and wheat, and oxygen and nitrogen are red and blue.