The structure of ibuprofen bound to cyclooxygenase-2.

The structure of ibuprofen bound to cyclooxygenase-2.
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DOI:
10.1016/j.jsb.2014.11.005
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发表时间:
2015-01
影响因子:
3
通讯作者:
Malkowski, Michael G.
Malkowski, Michael G.
中科院分区:
生物学3区
文献类型:
--
作者:
Orlando, Benjamin J.;Lucido, Michael J.;Malkowski, Michael G.

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环加氧酶(考克斯-1和考克斯-2)催化三尖杉酯碱生物合成中的限速步骤,并且是非甾体抗炎药(NSAID)和考克斯-2选择性抑制剂(coxib)的药理学靶点。布洛芬(IBP)是世界上最常见的非处方药之一。IBP的抗炎和镇痛特性被认为是由于抑制考克斯-2而不是考克斯-1。虽然已经解析了与考克斯-1结合的IBP的X射线晶体结构,但是对于同源同种型考克斯-2不存在这样的结构。我们用(R/S)-IBP的外消旋混合物测定了muCOX-2的晶体结构。我们的结构揭示了只有IBP的S-异构体被结合,表明S-异构体比R-异构体对考克斯-2具有更高的亲和力。在环加氧酶通道入口处的Arg-120和Tyr-355的突变分析证实了它们在IBP结合和抑制考克斯-2中的作用。我们的研究结果提供了IBP和考克斯-2之间的相互作用的第一个原子水平的细节。
The cyclooxygenases (COX-1 and COX-2) catalyze the rate-limiting step in the biosynthesis of prostaglandins, and are the pharmacological targets of non-steroidal anti-inflammatory drugs (NSAIDs) and COX-2 selective inhibitors (coxibs). Ibuprofen (IBP) is one of the most commonly available over-the-counter pharmaceuticals in the world. The anti-inflammatory and analgesic properties of IBP are thought to arise from inhibition of COX-2 rather than COX-1. While an x-ray crystal structure of IBP bound to COX-1 has been solved, no such structure exists for the cognate isoform COX-2. We have determined the crystal structure of muCOX-2 with a racemic mixture of (R/S)-IBP. Our structure reveals that only the S-isomer of IBP was bound, indicating that the S-isomer possesses higher affinity for COX-2 than the R-isomer. Mutational analysis of Arg-120 and Tyr-355 at the entrance of the cyclooxygenase channel confirmed their role in binding and inhibition of COX-2 by IBP. Our results provide the first atomic level detail of the interaction between IBP and COX-2.
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