Wang A J, Quigley G J, Kolpak F J, van der Marel G, van Boom J H, Rich A
Science. 1981 Jan 9;211(4478):171-6. doi: 10.1126/science.7444458.
Four different crystals of d(CpGpCpGpCpG) have been solved by x-ray diffraction analysis and all form similar left-handed double helical Z-DNA molecules in the crystal lattice. Two different conformations are observed for the phosphates in the GpC sequences, as the phosphates are found either facing the helical groove or rotated away from it. The latter conformation is often found when hydrated magnesium ions are complexed to a phosphate oxygen atom. These different conformations may be used when right-handed B-DNA joins left-handed Z-DNA. Atomic coordinates and torsion angles are presented for both types of Z-DNA.
通过X射线衍射分析解析了四种不同的d(CpGpCpGpCpG)晶体，并且它们在晶格中均形成相似的左手双螺旋Z-DNA分子。在GpC序列中观察到磷酸盐的两种不同构象，因为发现磷酸盐要么面向螺旋沟，要么从螺旋沟旋转离开。当水合镁离子与磷酸氧原子络合时，经常会出现后一种构象。当右手B-DNA连接左手Z-DNA时，可能会采用这些不同的构象。给出了两种类型Z-DNA的原子坐标和扭转角。
