Figure 4
Packing of d(CGCG[BrU]G) molecules viewed down the crystal c axis. The eight C—Br moieties in the unit cell are displayed, with the Br atoms highlighted as green spheres. Owing to the orientation of the helical DNA duplexes in the crystal, all C—Br bonds are oriented almost perpendicular to [001]. Also displayed is the in-plane component of the X-ray polarization direction for data sets (I) and (II). {For data set (III), the X-ray polarization direction was almost parallel to [001] and is therefore not displayed here.} |