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H and 31P NMR data show that adenosine 5′-(2-methylimidazol-1-ylphosphonate) (2-MeImpA) and guanosine 5′-(2-methylimidazol-1-ylphosphonate) (2-MeImpG), known as possible prebiotic precursors of polynucleotides, produce the corresponding diphosphonucleotides in sodium phosphate solution at pD 7.6. Phosphate ions also enhance the hydrolysis of these molecules by activating a water molecular associated as a weak complex with the phosphoryl moiety of 2-MeImpA and 2-MeImpG. A kinetic study was done by quantitative 1H NMR spectroscopy and mechanistic hypotheses were tested by semiempirical PM3 modelling.
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H 和 31P NMR 数据显示,
腺苷 5'-(
2-甲基咪唑-1-基
膦酸酯) (2-MeImpA) 和
鸟苷 5'-(
2-甲基咪唑-1-基
膦酸酯) (2-MeImpG),被称为可能的益生元前体的多核苷酸,在
磷酸钠溶液中以 pD 7.6 产生相应的二
磷酸核苷酸。
磷酸根离子还通过激活与 2-MeImpA 和 2-MeImpG 的
磷酰基部分形成弱复合物的
水分子来增强这些分子的
水解。通过定量 1H NMR 光谱进行动力学研究,并通过半经验 PM3 模型测试机械假设。