核酸片段构象分析中的碳-13核磁共振。3. 根据CCOP和HCOP核磁共振耦合常数确定d(TpA)中扭转角ε的大小。
Carbon-13 NMR in conformational analysis of nucleic acid fragments. 3. The magnitude of torsional angle epsilon in d(TpA) from CCOP and HCOP NMR coupling constants.
作者信息
Lankhorst P P, Haasnoot C A, Erkelens C, Altona C
出版信息
Nucleic Acids Res. 1984 Jul 11;12(13):5419-28. doi: 10.1093/nar/12.13.5419.
Abstract
Carbon-13 NMR spectra of the deoxyribonucleotide d(TpA), 3',5'-cyclic AMP and 3',5'-cyclic dAMP were measured. It is shown that the different substitution of C2' in deoxyribonucleotides versus ribonucleotides does not affect the vicinal C2'-C3'-O3'-P coupling to a measurable extent. Therefore, the same set of Karplus parameters may be used for the C2'-C3-O3'-P couplings in ribonucleotides and in deoxyribonucleotides. Vicinal carbon-phosphorus and proton-phosphorus coupling constants are used to calculate the magnitude of the torsion angle epsilon (C4'-C3'-O3'-P), which amounts to 195(0) in the trans conformer and to 261(0) in the gauche(-) conformer.
摘要
测量了脱氧核糖核苷酸d(TpA)、3',5'-环磷酸腺苷和3',5'-环磷酸脱氧腺苷的碳-13核磁共振谱。结果表明，脱氧核糖核苷酸与核糖核苷酸中C2'的不同取代对邻位C2'-C3'-O3'-P偶合的影响在可测量范围内不明显。因此，核糖核苷酸和脱氧核糖核苷酸中C2'-C3-O3'-P偶合可使用同一组卡普拉斯参数。利用邻位碳-磷和质子-磷偶合常数计算扭转角ε（C4'-C3'-O3'-P）的大小，反式构象中该值为195(0)，gauche(-)构象中为261(0)。
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