Aberrant cyclization affords a C-6 modified cyclic adenosine 5'-diphosphoribose analogue with biological activity in Jurkat T cells.

Aberrant cyclization affords a C-6 modified cyclic adenosine 5'-diphosphoribose analogue with biological activity in Jurkat T cells.
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DOI:
10.1021/jm201127y
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发表时间:
2012-02-23
影响因子:
7.3
通讯作者:
Potter, Barry V. L.
Potter, Barry V. L.
中科院分区:
医学1区
文献类型:
--
作者:
Moreau, Christelle;Kirchberger, Tanja;Zhang, Bo;Thomas, Mark P.;Weber, Karin;Guse, Andreas H.;Potter, Barry V. L.

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合成了两个嘌呤环6位修饰的烟酰胺腺嘌呤二核苷酸(NAD+)类似物,并研究了它们对ADP-核糖环化酶的底物性质。6-N-甲基NAD+(6-N-甲基烟酰胺腺苷5‘-二核苷酸10)水解得到线性6-N-甲基ADPR(腺苷5’-二磷酸核糖,11),而6-硫代NHD+(烟酰胺6-巯基嘌呤5‘-二核苷酸,17)生成环状二核苷酸。令人惊讶的是,核磁共振相关谱证实该化合物是N1环状产物6-硫代N1-cIDPR(6-硫代环肌苷5‘-二磷酸核糖,3),尽管相应的6-氧代类似物在N7环化是众所周知的。在Jurkat T细胞中,与母体5‘-二磷酸核糖N1-cIDPR不同,6-硫代N1-cIDPR可拮抗cADPR和N1-cIDPR诱导的钙释放,但在较高浓度时具有较弱的激动剂活性。因此,3被确定为第一个C-6修饰的cADPR(环腺苷5‘-二磷酸核糖)类似物拮抗剂,它代表了第一个荧光N1环化cADPR类似物的例子,是干预细胞信号转导cADPR途径的新的药理工具。
Two nicotinamide adenine dinucleotide (NAD+) analogues modified at the 6 position of the purine ring were synthesized, and their substrate properties toward Aplysia californica ADP-ribosyl cyclase were investigated. 6-N-Methyl NAD+ (6-N-methyl nicotinamide adenosine 5′-dinucleotide 10) hydrolyzes to give the linear 6-N-methyl ADPR (adenosine 5′-diphosphoribose, 11), whereas 6-thio NHD+ (nicotinamide 6-mercaptopurine 5′-dinucleotide, 17) generates a cyclic dinucleotide. Surprisingly, NMR correlation spectra confirm this compound to be the N1 cyclic product 6-thio N1-cIDPR (6-thio cyclic inosine 5′-diphosphoribose, 3), although the corresponding 6-oxo analogue is well-known to cyclize at N7. In Jurkat T cells, unlike the parent cyclic inosine 5′-diphosphoribose N1-cIDPR 2, 6-thio N1-cIDPR antagonizes both cADPR- and N1-cIDPR-induced Ca2+ release but possesses weak agonist activity at higher concentration. 3 is thus identified as the first C-6 modified cADPR (cyclic adenosine 5′-diphosphoribose) analogue antagonist; it represents the first example of a fluorescent N1-cyclized cADPR analogue and is a new pharmacological tool for intervention in the cADPR pathway of cellular signaling.
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