Synthesis and enzymic activity of some new purine ring system analogs of adenosine 3'5'-cyclic monophosphate
作者:Gyula Sagi、Kornelia Szucs、Gyorgy Vereb、Laszlo Otvos
DOI:10.1021/jm00102a006
日期:1992.11
atom at C-4 is substituted by a nitro or amino group, activities of the analogues increase considerably. The activating potencies of benzotriazole derivatives are similar to that of cAMP, irrespective of the C-4 substituents. The Ka' values of cyclic nucleotides containing benzimidazole were found to be higher for PK-II than for PK-I; e.g. the activity of 4-nitro-1-beta-D-ribofuranosylbenzimidazole 3'
合成了一系列新颖的腺苷3',5'-环一磷酸(cAMP)类似物,以及它们的6-脱氨基和6-硝基衍生物,其中嘌呤环被吲唑,苯并三唑和苯并咪唑代替。还制备了吲唑和苯并三唑呋喃核糖苷的3',5'-环单磷酸酯,其中糖-磷酸酯部分连接到杂环的N-2氮原子上。通过类似物激活兔骨骼肌中纯化的cAMP依赖性蛋白激酶I(PK-I)和牛心脏中cAMP依赖性蛋白激酶II(PK-II)的能力来测试其生物活性。每个环状核苷酸均能够以2.0 x 10(-8)至4.8 x 10(-6)M的一半最大浓度(Ka)激活两种PK同工酶。N-1-β-D-呋喃呋喃糖基吲唑的环状磷酸酯(13)被证明是对PK-1和PK-II的极弱活化剂,但是当吲唑被N-2结合到核糖上或当C处的氢原子时-4被硝基或氨基取代,类似物的活性大大增加。苯并三唑衍生物的活化能力与cAMP相似,而与C-4取代基无关。发现含有苯并咪唑的环状核苷酸的Ka'值对于PK-