Hare D R, Wemmer D E, Chou S H, Drobny G, Reid B R
J Mol Biol. 1983 Dec 15;171(3):319-36. doi: 10.1016/0022-2836(83)90096-7.
A general method of assigning the non-exchangeable protons in the nuclear magnetic resonance spectra of small DNA molecules has been developed based upon two-dimensional autocorrelated (COSY) and nuclear Overhauser (NOESY) spectra in 2H2O solutions. Groups of protons in specific sugars or bases are identified by their scalar couplings (COSY), then connected spatially in a sequential fashion using the Overhauser effect (NOESY). The method appears to be generally applicable to moderate-sized DNA duplexes with structures close to B DNA. The self-complementary DNA sequence d(C-G-C-G-A-A-T-T-C-G-C-G) has been synthesized by the solid-phase phosphite triester technique and studied by this method. Analysis of the COSY spectrum and the NOESY spectrum leads to the unambiguous assignment of all protons in the molecule except the poorly resolved H5' and H5" resonances. The observed NOEs indicate qualitatively that, in solution, the d(C-G-C-G-A-A-T-T-C-G-C-G) helix is right-handed and close to the B DNA form with a structure similar to that determined by crystallography.
基于在重水（(2H_2O)）溶液中的二维自相关（COSY）和核Overhauser效应（NOESY）光谱，已开发出一种用于确定小DNA分子核磁共振谱中不可交换质子的通用方法。特定糖或碱基中的质子基团通过其标量耦合（COSY）来识别，然后利用Overhauser效应（NOESY）以序列方式在空间上连接起来。该方法似乎普遍适用于结构接近B型DNA的中等大小的DNA双链体。通过固相亚磷酸三酯技术合成了自互补DNA序列d（C-G-C-G-A-A-T-T-C-G-C-G），并采用该方法进行了研究。对COSY谱和NOESY谱的分析使得除分辨不清的H5'和H5"共振外，分子中所有质子都能得到明确的归属。观察到的核Overhauser效应（NOE）定性地表明，在溶液中，d（C-G-C-G-A-A-T-T-C-G-C-G）螺旋是右手螺旋，且接近B型DNA结构，与晶体学确定的结构相似。
