Exploration of a potential difluoromethyl-nucleoside substrate with the fluorinase enzyme.

Exploration of a potential difluoromethyl-nucleoside substrate with the fluorinase enzyme.
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用氟化酶探索潜在的二氟甲基核苷底物。

DOI:
10.1016/j.bioorg.2015.11.003
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发表时间:
2016
影响因子:
5.1
通讯作者:
Thompson S
Thompson S
中科院分区:
化学1区
文献类型:
--
作者:
Thompson S

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本文报道了用氟化酶催化合成含二氟甲基核苷的研究。以腺苷为原料合成了5‘,5’-二氟-5‘-脱氧腺苷7(F2DA),并用等温滴定量热法与酶反应的天然产物5’-氟-5‘-脱氧腺苷2(FDA)进行了亲和力测定。然而,F2DA7与FDA2不同,F2DA7不与L-硒蛋氨酸发生酶催化反应生成Se-腺苷硒蛋氨酸。氟化酶与F2DA7和酒石酸盐的共晶结构被解析为1.8欧拉,揭示了二氟甲基相互作用是激活FDA2中单一氟所必需的。还观察到二氟甲基的氢与酒石酸盐配体的一个羟基氧基之间的异常氢键相互作用。桥联作用,再加上二氟甲基中固有的较强的C-F键,为为什么没有观察到反应提供了解释。
The investigation of a difluoromethyl-bearing nucleoside with the fluorinase enzyme is described. 5′,5′-Difluoro-5′-deoxyadenosine7(F2DA) was synthesised from adenosine, and found to bind to the fluorinase enzyme by isothermal titration calorimetry with similar affinity compared to 5′-fluoro-5′-deoxyadenosine2(FDA), the natural product of the enzymatic reaction. F2DA7was found, however, not to undergo the enzyme catalysed reaction withl-selenomethionine, unlike FDA2, which undergoes reaction withl-selenomethionine to generateSe-adenosylselenomethionine. A co-crystal structure of the fluorinase and F2DA7and tartrate was solved to 1.8 Å, and revealed that the difluoromethyl group bridges interactions known to be essential for activation of the single fluorine in FDA2. An unusual hydrogen bonding interaction between the hydrogen of the difluoromethyl group and one of the hydroxyl oxygens of the tartrate ligand was also observed. The bridging interactions, coupled with the inherently stronger C–F bond in the difluoromethyl group, offers an explanation for why no reaction is observed.
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发表时间: 1986
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