Synthesis of inositol phosphate-based competitive antagonists of inositol 1,4,5-trisphosphate receptors.

Synthesis of inositol phosphate-based competitive antagonists of inositol 1,4,5-trisphosphate receptors.
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基于肌醇磷酸盐的肌醇 1,4,5-三磷酸受体竞争性拮抗剂的合成。

DOI:
10.1039/c5ob02623g
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发表时间:
2016
影响因子:
3.2
通讯作者:
Konieczny V
Konieczny V
中科院分区:
化学3区
文献类型:
--
作者:
Konieczny V

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肌醇1,4,5-三磷酸受体(Inositol 1,4,5-trisphosphate receptor,IP 3R)是广泛存在于动物细胞中的一类胞内钙通道,介导细胞外刺激引起的胞内钙释放。多种合成的IP 3R激动剂已经确定了结构-活性关系,但现有的拮抗剂具有严重的局限性。我们结合了Ca 2+释放与IP 3R平衡竞争结合的分析,表明(1,3,4,6)IP 4是IP 3R 1的完全激动剂,其亲和力低于(1,4,5)IP 3。通过通用合成方案系统地操作该内消旋化合物提供了2-O-丁酰基-(1,3,4,6)IP 4和(1,3,4,5,6)IP 5的二聚类似物家族,其与(1,4,5)IP 3竞争结合IP 3R而不引起Ca 2+释放。这些新的类似物是第一种基于肌醇磷酸的IP 3R竞争性拮抗剂,其亲和力与唯一常用的竞争性拮抗剂肝素相当,肝素的效用受到脱靶效应的限制。
Inositol 1,4,5-trisphosphate receptors (IP3Rs) are intracellular Ca2+ channels that are widely expressed in animal cells, where they mediate the release of Ca2+ from intracellular stores evoked by extracellular stimuli. A diverse array of synthetic agonists of IP3Rs has defined structure–activity relationships, but existing antagonists have severe limitations. We combined analyses of Ca2+ release with equilibrium competition binding to IP3R to show that (1,3,4,6)IP4 is a full agonist of IP3R1 with lower affinity than (1,4,5)IP3. Systematic manipulation of this meso-compound via a versatile synthetic scheme provided a family of dimeric analogs of 2-O-butyryl-(1,3,4,6)IP4 and (1,3,4,5,6)IP5 that compete with (1,4,5)IP3 for binding to IP3R without evoking Ca2+ release. These novel analogs are the first inositol phosphate-based competitive antagonists of IP3Rs with affinities comparable to that of the only commonly used competitive antagonist, heparin, the utility of which is limited by off-target effects.
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