Preparation of 1'-C Deuterated Synthons for RNA Synthesis by H-Phosphonate Method Aiming at Two-Dimensional NMR Secondary Structure Studies
摘要:
通过一个12步的程序,从[1'-2H]核糖开始制备了1'-C氘代H-膦酸酯合成单体。该程序包括将1'-O-乙酰-2',3',5'-O-三苯甲酰[1'-2H]核糖与适当保护的核碱基进行核苷化,以及通过略微修改的描述程序制备核苷-H-膦酸酯。在Gene Assembler Plus DNA合成仪上进行了5'-G*C*U*A*U*UUAU-3'和3'-AC*G*A*U*A*AAGU-5'的自动RNA合成。随后,将这些特异氘代寡核糖核苷酸与相应的非氘代序列进行比较,使用2D-NMR NOESY谱。特定氘的加入导致了谱图的预期简化。
Preparation of 1'-C Deuterated Synthons for RNA Synthesis by H-Phosphonate Method Aiming at Two-Dimensional NMR Secondary Structure Studies
摘要:
通过一个12步的程序,从[1'-2H]核糖开始制备了1'-C氘代H-膦酸酯合成单体。该程序包括将1'-O-乙酰-2',3',5'-O-三苯甲酰[1'-2H]核糖与适当保护的核碱基进行核苷化,以及通过略微修改的描述程序制备核苷-H-膦酸酯。在Gene Assembler Plus DNA合成仪上进行了5'-G*C*U*A*U*UUAU-3'和3'-AC*G*A*U*A*AAGU-5'的自动RNA合成。随后,将这些特异氘代寡核糖核苷酸与相应的非氘代序列进行比较,使用2D-NMR NOESY谱。特定氘的加入导致了谱图的预期简化。
Transition state analysis of adenosine nucleosidase from yellow lupin (Lupinus luteus)
作者:Carl Bates、Zachariah Kendrick、Nancy McDonald、Paul C. Kline
DOI:10.1016/j.phytochem.2005.10.006
日期:2006.1
Using a bond order bond energy vibrational analysis, a transitionstate consisting of a significantly broken C-N bond, formation of an oxocarbenium ion in the ribose ring, a conformation of C3-exo for the ribose ring, and protonation of the heterocyclic base was proposed. This transitionstate was found to be very similar to the transitionstate for nucleoside hydrolase, another purine metabolizing