Phosphodiester Cleavage of Guanylyl-(3‘,3‘)-(2‘-amino-2‘-deoxyuridine): Rate Acceleration by the 2‘-Amino Function
作者:Mikko Ora、Heidi Linjalahti、Harri Lönnberg
DOI:10.1021/ja045060+
日期:2005.2.1
structural analogue of guanylyl-(3‘,3‘)-uridine, guanylyl-(3‘,3‘)-(2‘-amino-2‘-deoxyuridine), having one of the 2‘-hydroxyl groups replaced with an amino function, have been followed by RP HPLC in the pH range 0−13 at 90 °C. The results are compared to those obtained earlier with guanylyl-(3‘,3‘)-uridine, guanylyl-(3‘,3‘)-(2‘,5‘-di-O-methyluridine), and uridylyl-(3‘,5‘)-uridine. Under basic conditions
具有 2'-羟基之一的鸟苷酰-(3',3')-尿苷、鸟苷酰-(3',3')-(2'-氨基-2'-脱氧尿苷)的结构类似物的水解反应被氨基官能团取代,随后在 90 °C 下在 0-13 的 pH 范围内进行 RP HPLC。结果与之前用鸟苷酰-(3',3')-尿苷、鸟苷酰-(3',3')-(2',5'-二-O-甲基尿苷)和尿苷酰-(3 ',5')-尿苷。在碱性条件下(pH > 8),氢氧根离子催化的 P-O3' 键断裂([OH-] 中的一级)产生 2'-氨基-2'-脱氧尿苷和鸟苷 2' 的混合物, 3'-环磷酸酯水解为鸟苷2'-和3'-磷酸酯。在这些条件下,鸟苷酰-(3',3')-(2'-氨基-2'-脱氧尿苷)的反应性比鸟苷酰-(3',3')-尿苷低10倍。在酸性和中性条件下(pH 3-8),其中裂解的 pH 速率分布由两个 pH 独立区域(从 pH 3 到 pH 4 和从 6 到 8)、鸟苷酸-(3'